safely cut your laboratory energy usage in half€¢ lab bench top risk assessment • participatory...
TRANSCRIPT
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A Labs21 2012 Annual Conference Pre-Conference Training Session
Safely Cut Your Laboratory Energy Usage in Half
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Your Presenters
• Wendell C. Brase Vice Chancellor, Administrative and Business Services Chair, University of California Climate Solutions Steering Group
• Matt Gudorf Campus Energy Manager
• Marc A. Gomez Assistant Vice Chancellor for Facilities Management and Environmental Health & Safety
• David Kang Industrial Hygiene Energy Specialist
• Fred R. Bockmiller Manager, Engineering Group
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Learning Outcomes
1. Why focus on laboratories? 2. Can we afford a “smart lab” retrofit? 3. Are savings greater than 50% really possible? 4. Can these savings only be realized with new
construction? 5. Can we afford to keep a “smart lab” smart? 6. What if our energy costs differ from those in
California?
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Why laboratories?
They use 2/3 of the energy at research universities!
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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What is a “Smart Lab”
• “Smart Labs” are newly constructed or retrofitted laboratories that reduce building
system energy consumption by 50% or more, augment established safety protocols
and designs, and provide a data stream effectively commissioning the building
at all times.
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Smart Lab Evolution • UC Irvine’s Smart Labs Initiative includes multiple features
that were piloted and verified before campuswide deployment.
• Making the deep energy cuts that are required to meet a 50% savings goal requires that theories be tested, perceptions changed, and results evaluated.
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UCI’s Goal is to reduce lab energy consumption by 50%
Implement Smart Labs CDCV, ESDVR, Day Lighting and Lighting Controls, Low Pressure
Drop Filters, Remove Duct Noise Attenuators, Static Pressure Reset
Verify savings and use added
tools to constantly
commission labs
Measurement &
Verification
Set Goals & Targets
Analysis &
Development
Energy Improvement
Measures
Review data, Labs21 Toolkit,
Scope out energy project
Lab Efficiency Cycle
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Retrofitting or New Construction With the exception of the building shell, all Smart Labs retrofits can be completed in occupied buildings with minimal lab interruptions. • Service interruptions are directed in the contract for duration, timing, and notification
that must be given. • Scope of work may or may not include temporary supply and exhaust fans • Contractors must work with air flowing both supply and exhaust with all shutdowns
minimized even when this increases the number of steps or amount of work • Town hall meetings prior to construction with building occupants • Posted construction schedules in hallways and email updates • 2-week in-person notice given to each individual lab
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Prerequisites of a Smart Lab
1. Constant air volume (CAV) to variable air volume (VAV) 2. Pneumatic to direct digital control 3. Individual exhaust to manifolded exhaust 4. Differential pressure control for pumps 5. Thermostat location and other existing challenges
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When building load varies …
Shouldn’t the HVAC system follow? – Constant Air Volume – supply and exhaust flow rate remains the
same independent of: • Fume hood sash position • Thermal demand • Occupancy
– Variable Air Volume – supply and exhaust changes depending on:
• Fume hood sash position • Thermal Demand • Occupancy
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Variable | Constant Air Volume
Constant
Vent
ilatio
n Ra
te (C
FM)
Variable
CAV CFM VAV CFM
Savings
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Constant Volume Control Valves
Constant Volume Dual Duct Mixing Boxes
Typical Lab Prior to Retrofit
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Typical Lab Post-Retrofit
Mixing boxes for temperature control and control valves for flow control
Variable volume control valves
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New Mixing Boxes
Duct static pressure must be equal to prevent backflow
Temperature control of supply air
Control of flow (CFM) of supply air
Dual Duct to Control Valve Connection for Lab Supply Air and Proper Setup
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Pneumatic Control to Direct Digital Control
Direct Digital Controls
• Do not require frequent calibration • Can perform complex sequences • Can receive instructions from a master computer • Can transmit to a master computer information such as damper
position, room temperature, supply air quantity, and supply air temperature
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Individual Exhaust Some buildings have 1 exhaust fan per fume hood, zone, or possibly multiple zones • Typically small motors • No variable frequency drives installed • No redundancy in case of failure • No static pressure control • High level of maintenance required
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Manifolded Exhaust N+1 Exhaust Fans connected to a common plenum • Premium efficient motors • Variable frequency drives installed • Control based on static pressure of the exhaust duct
responding to increase or decrease in demand • Redundancy allowing for increased safety and no lab
downtime during service
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Manifold Exhaust Duct • Use a high quality, properly braced, industrial grade isolation damper • Inspect for leaking air • Check for proper slope to avoid pooling water
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Constant Flow to Variable Flow For maximum energy savings, reliability, and turn down, convert building heating water systems to variable volume. • Add Variable Frequency drives to the pumps • Replace 3-way valves with Pressure Independent Control Valves (PIC-V)
• Valve leakage wastes energy. Do not just close the bypass the best practice is to replace the valve.
• Check each VAV box for valve leakage, replacement of 2-way valves may be necessary. Leak-by is a significant energy waste.
• Install differential pressure monitoring and reset schedule
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Heat-generating equipment placed next to thermostats wastes energy.
Location, Location, Location
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Fixing the Known
If you have known issues in your lab, you need to address them now or as part of the retrofit (Smart Lab retrofits can resolve your deferred maintenance nightmare). • Failed lab air control valves • Stuck dampers • Broken actuators • Static pressure sensors that are failed or need recommissioning • Dirty duct work • Occupant installed snorkels, ductwork taps, other interesting
“improvements” • Over ridden VFD’s
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Monitoring and Verification Capabilities
1. What level of metering do you have? 2. What level of metering do you need? 3. Where is the information you need? 4. What metrics should I trend and make decisions with?
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ZONE-LEVEL USE
BUILDING SYSTEM USE
TOTAL ENERGY USE
Look Closer … Find More Savings
BUILDING Electric and Gas Meter
EMS HVAC, pumps, chillers
EMS, CDCV Fume hood use,
IAQ, thermal demand
Submetering lighting, plug load
EMS boiler, water heater
CDCV, EMS reheat
At the zone level, measurement and verification resolution are so high That you are essentially constantly commissioning the building .
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Building Management System
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Cost-Effective Submetering Meter Specs
• 12 channels per board • Meter accuracy +/- 0.5%
(0.25% typical) • V, I, active energy, reactive
energy, power factor
Current Transformer Specs
• Sensor accuracy +/- 1% • Current transformers 60-400 amps • Clamp-on installation
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Clamp-on CTs installed
Meter installed Connected to Internet
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00 140610KWH
mel r okC o r p o r a t i o n
dangerh igh vol t age
Acquisition SW SQL Express DB
00 140610KWH
mel r okC o r p o r a t i o n
dangerh igh vol t age
Database Server
Multiple Users
EnerACQ User Interface
User PC
EnerACQ User Interface
User PC
Individual 12 Channel Meters
System Description
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Visualization of Lab Energy Use
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Total Building Load
Watts / Square Foot Therms / Square Foot
Lighting Watts / Square Foot Interior Load vs Exterior Load Daytime Load vs Nighttime Load Lighting Load per Floor
HVAC Watts / Square Foot Therms / Square foot Daytime Load vs Nighttime Load CFM per Zone
Plug Load Watts / Square Foot Daytime Load vs Nighttime Load Plug Load per Floor Fixed Load vs User Load
LEED® Energy Star® Labs 21 Benchmarks
Information that is actionable
Metrics That Can Lead to Action
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Smart Lab Characteristics
1. Building Envelope
2. Lighting
3. Mechanical System
4. Lab Equipment Selection
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Building Envelope
Building shell is No. 1 driver
HVAC system size
Lighting requirements
Environmental impact
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Building Envelope Window shades
Light-colored concrete
Shaded entry via setback and overhang elements
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Building Envelope
Light shelves
Ultra high-performance glazing
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T-24 Cool-roof material R-30 roof insulation
Building Envelope
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Building Envelope
Landscape belts at building perimeters reduce heat and reflection impacts Drought-tolerant vegetation uses minimal reclaimed water
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Right-Sized Air Handlers & Exhaust
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Increased duct size
Low-pressure drop filters
NEMA premium efficiency motors
Low-Velocity Air Handling Units 350 fpm Face Velocity
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Why use high volume ductwork? Low-Velocity Exhaust Ductwork
• Low pressure drop laboratory air system design • Low velocity air distribution system • Low velocity exhaust ductwork
Increased duct size
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Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Lighting
• Lighting should be as flexible as possible. • Provide task lighting when additional illumination • is needed. • Encourage occupants to be conscious of their
lighting needs. • Do not discount the synergistic savings from
eliminating heat produced by over-illuminated spaces.
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Lab Area LPD from 1.1 to 0.6
Lab Prep LPD from 1.0 to 0.4
Prep Room LPD from 2.0 to 1.0
Corridor LPD
from 0.6 to 0.3
What Is Your Lighting Power Density? LPD = (Watts / Area) x Occupancy Sensor x Circuiting Strategy x Day lighting
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Non Daylighting Areas
32 Watt T8
25 Watt T8
NLO Ballast .87-.90 BF
RLO Ballast .71 BF
This retrofit on a 4 lamp fixture, on 4380 hours a year, saves 170 kWh per year. UC Irvine retrofitted ~15,000 fixtures campuswide, saving 2,550,000 kWh per year!
We had ZERO complaints!
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Automatic Daylighting Controls
Lab areas within 15 feet of windows and all private offices and conference rooms are equipped with automatic daylighting controls.
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Daylighting Without the Glare Perforated window blinds
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Page 50
Sequence
Auto on to 50% Manual on to 100% Auto off
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Lighting is controlled per lab bay -- not per lab -- to maximize savings.
Lighting
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Lighting
Lighting is controlled per lab bay -- not per lab -- to maximize savings.
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LED Task Lighting
Magnetically mounted LED task lighting
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Page 54
Bi-Level Lighting in Stairwells and Corridors
Corridor lighting is often on all year, 24 hours a day, and represents a good opportunity for occupancy sensing.
Bi-level lighting in stairwells is another opportunity that should not be overlooked.
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Page 55
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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PARTICIPATORY
EXERCISE
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1. Eaaaaaaa aaaa aa aaaaaaa aaa aaaaa
– 20 aaaaaaaa a a112 aaaaaa1000a a 6 aaaa a 12 aaaaa a 52 aaaaa a aa105 a a880a59 aaa aaaa
2. Caaa aa aaaaaaaaa
– a45 a 3 a a300 a a100 a 20 a a2a435
3. Naa aaaa aa aaaaaaa aaa aaaaa
– 12 Haaaa aaa aaa a a7 aaaaaaaaa aaaaaa aaaaaaa a 8a4 Haaaa aaa aaa
– 20 Faaaaaaa a a73 aaaaaa1000a a 6 aaaa a a8a4 Haaaa a a3 aaaaaaaaaaaaa aaaaaaaa
a 52 aaaaa a a0a105 a a120a53
– 20 Faaaaaaa a a38 aaaaaa1000a a 6 aaaa a a8a4 Haaaa a a7 aaaaaaaaaaaaa aaaaaaaa
a 52 aaaaa a a0a105 a a146a40
– a120a53 a a146a40 a a266a93
$880.59 – a266a93 a a613a66 a2435 a a613a66 a 3a97 aaaaa
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Page 59
The training session will resume in 10 minutes.
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Page 60
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Mechanical System
• Maximize occupant comfort • Minimize air change rates • Maintain lab safety • Provide a right-sized system that is
both variable and efficient • Make use of dashboards to review energy
consumption and indoor air quality
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What is an Air Change Rate Air Change Rate - Imperial Units Air change rate - air changes per hour - can be expressed in imperial Units as
n = 60 q / V Where n = air changes per hour q = fresh air flow through the room (Cubic Feet per Minute, cfm) V = volume of the room (Cubic Feet)
q = supply in CFM
V = Length x Width x Height
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Autoclaves Ultra-low temp freezers Refrigerators Incubators Water purification systems Microscopes Computers Shake tables
Lighting Occupants Building shell Windows
6-10 ACH
High air change rates often exceed all of the lab’s process and operational loads.
Mechanical System Balance
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Autoclaves Ultra-low temp freezers Refrigerators Incubators Water purification systems Microscopes Computers Shake tables
Lighting Occupants Building shell Windows
6-10 ACH
Balance to the room is brought about by adding varying amounts of reheat.
Mechanical System Balance
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2-4 ACH
Autoclaves Ultra-low Temp Freezers Refrigerators Incubators Water purification systems Microscopes Computers Shake tables
Lighting Occupants Building Shell Windows
Lowering the air change rate with the installation of a CDCV system swings the balance the other way.
Mechanical System Balance
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2-4 ACH
Autoclaves Ultra -low temp freezers Refrigerators Incubators Water purification systems Microscopes Computers Shake tables
Lighting Occupants Building Shell Windows
Lower air change rates more closely match the natural lab process load, reducing both fan power and reheat.
Mechanical System Balance
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Lab HVAC Load
Process heat gain from lab equipment is the primary source of internal heat gain in many facilities. • Autoclaves • Ultra-low temperature freezers • Refrigerators • Incubators • Water purification systems • Microscopes • Computers • Shake tables
You need a plan to deal with the heat!
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Dealing with the heat is the only way to reduce air change rates
Equipment corridors have slot exhaust grills to remove heat from the space.
Freezer Heat Rejection Slot exhaust diffusers
Equipment corridors with slot exhaust grills are located on each floor to reduce lab heat gain.
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Page 69
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 70
Centralized Demand Controlled Ventilation
• Monitors the indoor air quality of multiple zones through a network of structured cables and air data routers
• Analyzes the sampled air with a series of sensors • Provides the lab air control system with an input for
increased ventilation when necessary. • The system is only an input to your lab air control system,
no different than a thermostat, or sash position sensor.
Target is 4 air changes per hour in occupied labs and 2 air changes per hour in unoccupied labs.
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Demand-Controlled Ventilation Completed In Construction
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1. Room sensor mounted in general exhaust duct samples a packet of air
2. Packet of air is routed to the Sensor Suite
3. Sensors measure indoor air quality
4. Information Management System determines need for increased ventilation, commands VAV controllers, and serves data to a web server.
5. System monitoring is available via a web based interface.
CDCV
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Page 73
Lab Room 101 Lab Room 102 Classroom 103 Supply Air Reference
Probe
Web Based User Interface
BMS Connectivity
Sensor Suite with TVOC,
CO2, dewpoint & particulate
sensors
Air Data Router
Vacuum Pump
Server
Room Sampling
Port
Supply Air Duct
General Exhaust Duct
GEX Duct Probe (typ.)
Air Data Router
CDCV System Architecture
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CDCV Components Sensor Suite
Structured Cable
Duct Probe
Vacuum Pump
Air Data Router
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CDCV - Sensors
Type Sensors Activation Range
Units Low High
TVOC PID (10.63V) 0.1 1.0 ppm
TVOC Metal Oxide (MOS) 0.3 3.0 ppm
CO2 NDIR 300 3,000 ppm
Particulate Optical 500,000 5,000,000 pcf
CO Electrochem 2 20 ppm
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Smart Labs - Added Features
UC Irvine seeks to continuously update the lab air control system with safety and energy saving features. Safety • Red Buttons • Lab display unit (LDU) Energy Savings • Occupancy sensors
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Red Buttons
Red Button – In the event of a chemical spill or other event requiring increased ventilation in a lab, an emergency ventilation override button has been installed. Pressing this button will increase air change rates to maximum while maintaining negative lab pressurization.
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Lab Display Units
• Currently in use in Gross Hall • Programmed to display ACH,
occupancy status and ventilation offset information within lab
• Provide real-time feedback to lab occupants
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Smart Lab “Safety Net”
Occupant Training Describes Smart Lab features
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Laboratory is a “System”
HVAC elements must work together as a system for contaminant control: 1. Primary control − Local exhaust ventilation (at source
of contaminant generation) 2. Secondary control − Dilution of room air (ACH)
A key focus of the bench top risk assessment is to drive contaminants into primary controls whenever possible.
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Primary (Source) Control – Fume Hood
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Primary (Source) Control - Snorkel
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Primary (Source) Control - Glove Box
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Laboratory is a “System”
For contaminant control, critical to have: • All HVAC elements in balance and maintained • Fume hood commissioning & placement • Good air mixing to avoid contaminant build-up &
achieve effective dilution
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Air Mixing for Good Air Quality
• Air diffusers are key to promote better air mixing • Explore various diffuser styles • Evaluate air mixing − smoke studies or computational
fluid dynamics (CFD) • Separate air diffusers and air returns
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Good Air Mixing − Fabric Air Diffuser
Less air turbulence to fume hoods
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Air Changes per Hour (ACH) (secondary control – dilution ventilation)
• 6+ ACH 4/2 ACH setback with occupancy sensing
• CDCV senses chemical and increases ACH • Sensor failure must “fail safe” to 6 ACH
– Sensor suite does not detect all chemicals • Visual signal to occupant of ACH • Emergency exhaust red button
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Question: Is Increased ACH Safer?
“Specification of Airflow Rates in Laboratories” by Tom Smith, Exposure Control Technologies, Conclusions:
– ACH as a metric for dilution is “too simplistic”. – Must consider other factors that lead to exposure, (i.e.
contaminant generation rate, air mixing, etc.) – “Increased airflow [may increase] contaminant generation
and distribution throughout the space” – May lead to “false sense of safety”
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Answer: Not Necessarily
Alternatives to simply increasing ACH:
– Base air exchange rate on contaminant generation – Review lab practices, especially outside fume hood – Attain proper air mix ratios – Reduce overall ACH to save energy and increase ACH as
needed via “smart controls
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Page 90
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 91
Implementing CDCV
Risk Assessment of Lab Bench Top Processes to Ensure Safety in Smart Labs
• Energy savings can be achieved without compromising safety • Lab ACH determination requires:
– Active EH&S involvement in bench top risk assessment of lab operations with lab staff
– Contaminant source control – Reassessment when lab changes occur – Current/complete chemical inventories
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Step 1 - Lab Bench Top Risk Assessment Process
Conduct room-by-room hazard screening – Industrial hygienist (IH) evaluates worker exposure – Review chemicals inventory/operations – Interview lab staff – Review engineering controls – Focus is outside of fume hood
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Lab Bench Top Screening Process
• Compare screening data with risk assessment criteria
• Enter screening data in database – If follow-up needed, no ACH reduction – If no follow-up needed, reduce ACH
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Risk Assessment Criteria High-risk labs – no ventilation reduction
– Biosafety Level 3 (airborne biohazard)
– Highly toxic gases – Special ventilation requirements – Chemicals/operations identified as high risk by bench top
assessment or follow-up exposure monitoring – Fire area control limits exceeded
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Risk Assessment Criteria
• Chemicals of Concern – Acutely toxic by inhalation – Asphyxiants – Anesthetic gases – Carcinogens – Reproductive toxins – Air contaminants that have occupational exposure
limits (PELs, TLVs) – Strong odor producers
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Risk Assessment Criteria
Fire Concern – Flammables/combustibles/toxics - amounts stored over
fire control area limits – 6 ACH at all times – Reduce amounts!
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Risk Assessment Criteria
Animal Allergen Concern Airborne Allergens (proteins) from animal dander – No exposure limits for allergens – 6+ ACH at all times in 24/7 animal areas The most allergenic animals are: – Mice – Rats – Guinea pigs
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Page 98
Step 2 − Industrial Hygiene Follow-Up
Post Initial Risk Assessment • Follow-up for chemicals of concern
– Lab staff exposure monitoring studies – Work with lab staff to improve work practices
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Page 99
Step 2 − Industrial Hygiene Follow-Up Post Initial Risk Assessment
• Follow-up for chemicals of concern – Ventilation reduction possible if exposures can be
controlled (improved work practices) – ACH may be increased until work practices are
improved
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Page 100
High or Low Hazard Lab?
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Page 101
High or Low Hazard Lab?
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Page 102
High or Low Hazard Lab?
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Page 103
High or Low Hazard Lab?
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Page 105
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Page 106
CDCV and Risk − Challenges
• Lack of “universal” CDCV sensor for all chemicals • Ongoing need for risk assessments of lab operations • Changes in research operations and staff • Incomplete chemical inventories • Great variety of hazardous operations and chemicals • Uncertainty of health effects of chemicals
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Page 107
CDCV and Risk − Challenges EH&S resource demand for
– Ongoing need for hazard assessments – Exposure monitoring – Work practice corrections – Potential complaint investigations – Training
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Page 108
Risk Assessment − Next Steps
• Develop system to identify changes in lab operations • Re-assess bench top operations:
– New researchers arrive – Lab moves (notification!) – Periodic re-assessments
• Promote current/complete chemical inventories
Lowered ACH is not “sustainable” without EH&S risk assessments and management of change!
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Page 109
Lab ACH Reductions
Based on Risk Assessments Results to Date • 13 lab buildings (~250 labs) • 1540 lab rooms assessed • 1346 lab rooms - reduced ACH (~87%) • 194 lab rooms - not reduced ACH (~13%)
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Page 110
Risk Assessment Conclusions
• Energy savings can be achieved without compromising safety
• Lab ACH determination requires: – Flexibility (evolving process) – Contaminant source control – Active EH&S involvement in risk assessment of lab
operations with lab staff – Reassessment when lab changes occur
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Page 111
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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PARTICIPATORY
EXERCISE
Haaaaaa Paaaaaaa
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Page 113
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 114
Low Flow/High Performance Fume Hoods
Quick Summary • Another potential solution in the energy savings tool kit • Provides the ability to add fume hoods to buildings
with limited HVAC capacity • Designed to perform at lower face velocities • Study completed to compare low flow vs. standard
fume hoods
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Fume Hood Regulations
• Federal OSHA Standard – Face velocity not specified – 13 Carcinogens exception
• Cal-OSHA Standard – 100 fpm face velocity
• Low flow fume hoods allowed in 49 states
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Traditional Hood Design
• Components & Air Flow
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Page 117
Low Flow Fume Hood Design
• Components & Air Flow
Sash
UniqueAirfoil Design Deeper
Work Surface
Exhaust Plenum
Baffle
Increased Hood Depth
Advanced Baffle Design
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Page 118
Study Objectives
1. Can low flow fume hoods operating at less than 100 fpm provide equal or better protection than a traditional fume hood operating at 100 fpm?
2. What is the minimum velocity and operating conditions where satisfactory performance can be confidently provided?
3. What factors affect performance? • average face velocity • turbulence of face velocity • cross draft velocity • pedestrian walk-bys
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Page 119
Low-Flow Fume Hood Study Conclusions
• All hoods - performed best at 18” sash height – All tracer gas results were well under 0.1ppm “as used”
ASHRAE criteria – At 100, 80, and 60 fpm
• All low flow hoods performed better than standard hood at 80 & 100 fpm full open sash
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Low-Flow vs. Standard Fume Hood Study Results Highest Average Concentration for Tracer Gas Tests
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Factors Affecting Performance
• Continuous cross draft (50 fpm) most impactful at 45
to hood • Walk-by drafts were less impactful • Hood placement critical to avoid cross drafts
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Page 122
Low-Flow Fume Hood Next Steps
• Cal OSHA - granted UC Irvine permanent variance for use with conditions – 80 fpm average face velocity – ASHRAE 110 testing annually for 3 years, then every 3rd year
thereafter • Requesting modification to variance to allow use campus-
wide, then UC wide • Creating decision tree for use!
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Page 123
Decision Tree for Low Flow Fume Hood Retrofits or Replacements
1 Does the room have more than one fume hood? Yes = potential candidate No = potential candidate— Go to question six.
2 Can the lab space accommodate the deeper footprint of a low flow hood?
Yes = potential candidate No = not a candidate— END
3 Is the building Constant Volume?
Yes = potential candidate. No = potential candidate— However, the existing hoods should have hood occupancy sensors and a control system already (such as setback or sash closers) which reduce potential savings of Low Flow Hood as a replacement for an existing hood.
4 Is the hood served by a single fan? Yes = potential candidate— Skip to question five. No = potential candidate— Skip to question eleven.
5 Is the fan belt driven? Yes = potential candidate— Go to question ten. No = Go to question seven.
6 Does the hood serve as the minimum ventilation system for the space? Yes = not a candidate— END No = potential candidate— Return to question two.
7 Does the direct drive fan have a variable speed drive? Yes = potential candidate—Skip to question nine. No = potential candidate
8 Does the direct drive fan have a throttling valve at the inlet? Yes = potential candidate No = not a candidate—END
9 Is the variable speed drive already running at minimum? Yes = not a candidate— END No = potential candidate
10 Will reducing flow adversely affect the stack discharge velocity? Yes = not a candidate— END No = candidate— END
11 Does the manifolded system have a bypass? Yes = candidate— END No = not a candidate— END
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Page 124
The training session will resume in 10 minutes.
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Page 125
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 126
JUST SAY NO TO BYPASS AIR Exhaust Stack Discharge Volume Reduction
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Page 127
Exhaust Stack Discharge Volume Reduction (ESDVR)
What is bypass and how much energy is wasted? If so much energy is wasted, what can we do about it? Steps in the wind-tunnel study process Stack extensions Other implementation results Next steps: wind-responsive controls Participatory exercise
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Page 128
What is a bypass?
The bypass brings outside air from the roof through the fan to ensure design velocity out the top of the stack regardless of flow through the building, thus creating a constant-volume system out of a variable-volume system and wasting energy.
This is a High-Plume Discharge Fan. Bypasses are also fitted to systems with other types of fans.
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Page 129
Why have a bypass?
• Allows the system to operate safely and maintain a minimum velocity of discharge to ensure that the plume of air rises up sufficiently to avoid re-entrainment to the building or contamination of adjacent buildings.
• Allows constant-speed and volume fans to work with variable-volume flow from the building
• Provide a simple means of controlling static pressure in the exhaust ducting
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Lab Exhaust Diagram
Peak Wind
Exhaust Fan Bypass Damper Plenum
Fume Hood Building Air Intake
Balcony
3500
FPM
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Page 131
How much energy is wasted?
• If building flow is 25,000 cfm and required flow from the stack to attain 3,500 fpm is 50,000 cfm, the energy wasted is 50% at a minimum.
• By reducing the flow in the stack one also reduces the pressure drop in the stack and therefore the effect on energy savings is compounded.
• Each situation is specific to the site.
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Page 132
If so much energy is wasted, what can we do about it?
• Detailed modeling in a wind tunnel to determine the minimum exhaust velocity required as opposed to standard practice
• Install variable-speed drives to reduce fan flow • Program control system to run multiple fans in parallel with a goal of 0%
bypass
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One can’t just close bypass and turn down exhaust volume. Re-entrainment at balcony
2000
-250
0 FP
M
What about closing bypass and letting fans “ride the curve”?
Peak Wind
Building air intake
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Increase stack height
2000-2500 FPM
What about raising stack height?
Peak Wind
2000-2500 FPM Bypass closed
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Page 135
Steps in the wind-tunnel study process 1. Build model of campus
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Page 136
Steps in the wind-tunnel study process
1. Build model of campus 2. Install model stacks
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Steps in the wind-tunnel study process
1. Build model of campus 2. Install model stacks
3. Install air sampling points (“receptors”)
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Page 138
Flow Visualization | Natural Sciences 1
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Page 139
Flow Visualization | Natural Sciences 1
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Stack Extensions
1. Extraordinary savings 1. Small costs up front 2. Passive system that has no maintenance costs 3. Reduced fan energy in one case by 78%
2. But what about the “ugliness” factor?
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Page 141
The Ugliness Non-Factor: Before
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Page 142
The Ugliness Non-Factor: After
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Page 143
Implementation
• Install variable frequency drives (VFD)
• Close bypass dampers • No stack extension needed • Annual energy savings: 581,749 kWh
Sprague Hall
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Page 144
Implementation
• Install variable frequency drives (VFD)
• Static pressure reset • 4’ stack extensions • Annual energy savings: 928,722 kWh
Natural Sciences II
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Page 145
Implementation
• No stack extensions • Install variable frequency
drives (VFD) • Static pressure reset • Annual energy savings: 286,594 kWh
Hewitt Hall
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Page 146
Install anemometer 2000-2500 FPM
Peak Wind
Can we do better?
2000-2500 FPM
Bypass closed or open If building flow insufficient to provide velocity needed
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Page 147
No Wind Install anemometer
1500-2000 FPM
Can we do better?
Bypass closed until fans at minimum speed, then throttle As needed to maintain static pressure
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0102030405060708090
1 3 5 7 9 11 13 15 17 19 21 23
CFM
x 1
000
Time
Typical Design
1% Design
Required by Dispersion
Required by High Air Change Rate
Required by Low Air Change Rate
ESDVR Savings Without Wind Sensing ESDVR Energy Savings With Wind Sensing
Typical Timeline Exit Velocity Requirements
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Page 149
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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PARTICIPATORY
EXERCISE
Haaaaaa Paaaaaaa
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Page 151
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 152
Plug Load
• Outside the direct control of the facility manager • Growing rapidly with increases in automated lab
equipment • Control or containment? • What is your experience?
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Page 153
A Pristine (Unassigned) Lab
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Page 154
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Page 155
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Page 156
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Page 157
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Page 158
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Page 159
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Page 160
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Page 161
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Page 162
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Page 163
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Page 164
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Haa aaaa aaa
aaaaaaaaa aaaa aaaaa
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Page 166
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Page 167
• Air change rates (ACR) • Internal air quality (IAQ) • Sash position of each fume hood • Occupancy • Relative humidity • Temperature • Total supply • Total exhaust
CDCV System Dashboard and Data Trends for Each Zone
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Visualization of lab HVAC use
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• Fume hood usage range • This hood shows usage between 0%
open and 65% open.
• Change in average sash position from the month prior • Red indicates poorer average green indicates improved
average sash management
Monitoring Fume Hood Usage
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Page 170
Smart Labs are not just controls and sensors. Smart Labs provide real time feedback as well as monthly reporting data that is actionable. Return on investment is directly affected by lab practices.
How many hoods are in use right now in your lab and how far open are the sashes?
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0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
Sun
day
4/3
/11
18
:11
Mo
nd
ay 4
/4/1
1 2
:24
Mo
nd
ay 4
/4/1
1 1
0:5
0
Mo
nd
ay 4
/4/1
1 1
9:0
0
Tue
sday
4/5
/11
3:1
3
Tue
sday
4/5
/11
12
:38
Tue
sday
4/5
/11
20
:45
We
dn
esd
ay 4
/6/1
1 4
:55
We
dn
esd
ay 4
/6/1
1 1
4:5
6
Thu
rsd
ay 4
/7/1
1 0
:46
Thu
rsd
ay 4
/7/1
1 1
1:0
9
Thu
rsd
ay 4
/7/1
1 2
1:0
4
Frid
ay 4
/8/1
1 7
:55
Frid
ay 4
/8/1
1 1
8:2
6
Satu
rday
4/9
/11
2:3
7
Satu
rday
4/9
/11
10
:47
AC
H
CFM
Total Flow & ACHAll labs, Sunday to Saturday
Total Supply
Total ACH
Total Flow and ACH Profile Six-Day Period
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Page 172
0
2
4
6
8
10
12
14
Sund
ay 4
/3/1
1 18
:11
Mon
day
4/4/
11 2
:24
Mon
day
4/4/
11 1
0:50
Mon
day
4/4/
11 1
9:00
Tues
day
4/5/
11 3
:13
Tues
day
4/5/
11 1
2:38
Tues
day
4/5/
11 2
0:45
Wed
nesd
ay 4
/6/1
1 4:
55
Wed
nesd
ay 4
/6/1
1 14
:56
Thur
sday
4/7
/11
0:46
Thur
sday
4/7
/11
11:0
9
Thur
sday
4/7
/11
21:0
4
Frid
ay 4
/8/1
1 7:
55
Frid
ay 4
/8/1
1 18
:26
Satu
rday
4/9
/11
2:37
Satu
rday
4/9
/11
10:4
7
ACH
Typical Lab flow profileSingle Lab, Sunday to Saturday
RM 1200B.RM 1200 ACH
Air Change Rates for Room 1200 Graphed Over Six Days
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Page 173
The delta between 6 air changes per hour in previous labs designs and the 4/2 ACH of Gross Hall is yielding ~$58,000 per year in energy savings.
What does energy savings look like?
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HDP1 is a distribution board on the 1st floor. It is responsible for feeding several equipment loads, autoclave units EQ2, EQ3, and EQ4. HDP1 is fed directly from the main switchboard at 480/277 volts. The board maximum current rating is 225 amps. The largest load on HDP1 is the medium autoclave EQ2, which is rated at 75kVA.
Auto
clav
e In
Gro
ss H
all
60 kW peak
Zone-Level Resolution Can Lead to Peak Demand Savings
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Gross Hall average site demand ranges from a baseline of 148kW to an average peak of 205 kW
Autoclave EQ2
Did running the autoclave on peak just cost you $600 in demand charges?
Zone-Level Resolution Can Lead to Peak Demand Savings
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Page 176
Hewitt Hall vs. Gross Hall
Designed in 2001 • Exceeded Title 24 by 23.7% • Biomedical research • Lighting upgrade in 2009 • Exhaust stack discharge velocity
Reduction in 2009 • Re-commissioned in 2010 • 76,905 square feet
Designed in 2009 • Exceeded Title 24 by 50.4% • Biomedical research • Designated LEED Platinum - NC • 94,705 square feet
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Gross Hall’s Lab Utilization Nearly Twice Hewitt Hall’s
0%
20%
40%
60%
80%
100%
Gross Hall Hewitt Hall
58% 27%
Percent Occupied by Building (7 days)
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-
1.00
2.00
3.00
4.00
5.00
6.000:
15
1:00
1:45
2:30
3:15
4:00
4:45
5:30
6:15
7:00
7:45
8:30
9:15
10:0
0
10:4
5
11:3
0
12:1
5
13:0
0
13:4
5
14:3
0
15:1
5
16:0
0
16:4
5
17:3
0
18:1
5
19:0
0
19:4
5
20:3
0
21:1
5
22:0
0
22:4
5
23:3
0
Wat
ts p
er S
quar
e Fo
ot
Time of Day
Watts / Gross Square Foot
Hewitt Hall
Gross Hall
Building Load Per Square Foot
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Previous Best Practice
Space Type Gross Hall
0.9 watts/sqft
Offices 0.49 watts/sqft
1.1 watts/sqft
Labs
0.66 watts/sqft
1 watts/sqft
Overall Conditioned Space 0.61 watts/sqft
00.10.20.30.40.50.60.70.80.9
1
0:15
1:30
2:45
4:00
5:15
6:30
7:45
9:00
10:1
511
:30
12:4
514
:00
15:1
516
:30
17:4
519
:00
20:1
521
:30
22:4
50:
00
Wat
ts P
er S
quar
e Fo
ot
24 Hour Actual Watts Per SQFT
Hewitt Hall Watts Per Sqft Gross Hall Watts Per Sqft
02468
101214161820
0:15
1:15
2:15
3:15
4:15
5:15
6:15
7:15
8:15
9:15
10:1
511
:15
12:1
513
:15
14:1
515
:15
16:1
517
:15
18:1
519
:15
20:1
521
:15
22:1
523
:15
kW
24 Hour Demand Curves
Hewitt Hall 2nd Floor Lighting Demand
Gross Hall 2nd Floor Lighting Demand
0.3W/1000 x 8760 x$0.105kWh= $0.2759 /SqFt
Lighting
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Page 180
Benchmarking It is easy to see how campus labs compare to each other but what about across the country?
http://labs21benchmarking.lbl.gov/CompareData.php
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Adding Hewitt and Gross Halls
• Hewitt is right at the average • Gross Hall beats the most efficient lab
benchmarked by 18%
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Lab Air Flow vs. Time • The HVAC savings of 1 CFM/ft2 at $4-5 per CFM can reduce
operational significantly. • A 1 CFM reduction at Hewitt Hall in just the open lab bays
would reduce operational cost by $83,250 per year
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
8/17
/11
13:4
1
8/17
/11
21:4
1
8/18
/11
5:41
8/18
/11
13:4
1
8/18
/11
21:4
1
8/19
/11
5:41
8/19
/11
13:4
1
8/19
/11
21:4
1
8/20
/11
5:42
8/20
/11
13:4
2
8/20
/11
21:4
2
8/21
/11
5:44
8/21
/11
13:4
4
8/21
/11
21:4
4
8/22
/11
5:46
8/22
/11
13:4
6
8/22
/11
21:4
6
8/23
/11
5:48
8/23
/11
13:4
8
8/23
/11
21:4
8
8/24
/11
5:49
8/24
/11
13:4
9
8/24
/11
21:4
9
8/25
/11
5:50
8/25
/11
13:5
0
8/25
/11
21:5
0
8/26
/11
5:52
8/26
/11
13:5
2
8/26
/11
21:5
2
8/27
/11
5:53
8/27
/11
13:5
3
8/27
/11
21:5
3
8/28
/11
5:55
8/28
/11
13:5
6
8/28
/11
21:5
6
8/29
/11
5:57
8/29
/11
13:5
7
8/29
/11
21:5
7
8/30
/11
5:59
CFM
/ Sq
. Ft.
CFM / Square Foot ComparisonGross Hall vs. Hewitt Hall
Gross CFM/ Sq. Ft.
Hewitt CFM / Sq. Ft.
1.53 CFM/ ft2 average.
0.52 CFM/ ft2 average.
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AHU + EF + Pumps + Chilled Water Building Square Feet
0
1
2
3
4
5
6
0:15
0:45
1:15
1:45
2:15
2:45
3:15
3:45
4:15
4:45
5:15
5:45
6:15
6:45
7:15
7:45
8:15
8:45
9:15
9:45
10:1
510
:45
11:1
511
:45
12:1
512
:45
13:1
513
:45
14:1
514
:45
15:1
515
:45
16:1
516
:45
17:1
517
:45
18:1
518
:45
19:1
519
:45
20:1
520
:45
21:1
521
:45
22:1
522
:45
23:1
523
:45
Wat
ts p
er S
quar
e fo
ot
Hewitt Hall Gross Hall Gross Total Building Hewitt Hall Total Building
1 Watt /1000 x 8760 hours x $0.105kWh= $0.92 /SqFt
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Page 184
Comparing Two Similar Floors
Hewitt Hall – 2nd floor Gross Hall – 2nd floor
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Lab Air Supply and Exhaust Hewitt Hall – 2nd floor • 6 Air changes per hour minimum • No set back during unoccupied periods • Zone presence sensors on fume hoods
Gross Hall – 2nd floor • 4 Air changes per hour minimum occupied • 2 Air Changes per hour minimum unoccupied • Zone presence sensors on fume hoods • Centralized Demand Controlled Ventilation
system adjusting ACH for indoor air quality.
Lab 2501 Lab 2200
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Evidence of Where Building’s HVAC Energy Savings are Achieved
• Air change rates are dynamic responding to occupancy, IAQ, sash position, and thermal demands
• Lab 2200 averages 4 air changes per hour
• Air change rates are dependent on sash position and thermal demand.
• Lab 2501 averages 8 air changes per hour Hewitt Hall
Lab 2501
Gross Hall Lab 2200
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Page 187
Continuous Commissioning
-- Meaningful analysis and reports -- Actionable information -- Verification of actions taken:
physical and behavioral
CDCV • Find failed lab air control
valves • Review of fume hood sash
management • Ensure safe lab air quality • Find excessive air flows
due to point sources of heat
Submetering • Monitoring of fans, pumps,
and lighting control systems
• Verification of energy retrofits
• Reduce demand charges by modifying operations
BMS • Locate simultaneous
heating and cooling • Reset of static pressure to
minimum required • Control run times of office
areas
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Page 188
Troubleshooting a CO2 leak With the CDCV System
• Researcher connects 4 tanks of CO2 to the lab distribution system and within 8 hours they are empty.
• To find the leak the research staff could have spent hours soaping lines and connections and wasting additional gas listening for the leak.
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Suspected location of CO2 leak
Researcher first plotted all rooms for CO2
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The leak was quickly located and repaired!
Researcher Then Plotted the Room with the Suspected CO2 Leak
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Page 191
The Knowledge Center has been used to locate lab equipment placed too close or under thermostats.
Discovery of Lab Equipment Driving Thermal Demand
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The training session will resume in 10 minutes.
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Page 193
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Return on Investment Commissioning
– Cx, Rx, MBCx is approximately $2 per SqFt – Hewitt Hall MBCx $131,309 – Net present value for 10 years (MBCx every 5 years) Hewitt Hall
$113,590
$(100,000.00)
$(50,000.00)
$-
$50,000.00
$100,000.00
$150,000.00
$200,000.00
$250,000.00
1 2 3 4 5 6 7 8 9 10 11
Cumulative Cash Flow MBCx Project
MBCx Cumulative Cash Flow MBCx Net Savings
MBCx
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$(200,000.00) $-
$200,000.00 $400,000.00 $600,000.00 $800,000.00
$1,000,000.00 $1,200,000.00 $1,400,000.00
1 2 3 4 5 6 7 8 9 10 11
Cumulative Cash Flow
Smart CCx Cumulative Cash Flow Smart CCx Net Savings
Sub metering and monitoring your lab can be very competitive with the cost of a single commissioning effort.
CDCV ~$3.12 per SqFt Sub metering $0.20 per SqFt Hewitt Hall Sub Metering and CDCV $302,888 Net present value for Hewitt Hall continuous commissioning (10 years) $665,903
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Return on Investment Smart CCx − although a larger initial investment − provides for greater long-term savings as well as strategic analysis, monitoring, and savings that cannot be accomplished with traditional MBCx.
$(200,000.00)
$-
$200,000.00
$400,000.00
$600,000.00
$800,000.00
$1,000,000.00
$1,200,000.00
$1,400,000.00
1 2 3 4 5 6 7 8 9 10 11
Cumulative Cash Flow MBCx vs. SMART CCx
Smart CCx Cumulative Cash Flow Smart CCx Net Savings MBCx Cumulative Cash Flow MBCx Net Savings
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Results:
Laboratory Building BEFORE Smart Lab Retrofit
Name Type1
Estimated Average
ACH
VAV or CV
More efficient
than code?
Croul Hall P 6.6 VAV ~ 20%
McGaugh Hall B 9.4 CV No
Reines Hall P 11.3 CV No
Natural Sciences 2 P,B 9.1 VAV ~20%
Biological Sciences 3 B 9.0 VAV ~30%
Calit2 E 6.0 VAV ~20%
Gillespie Neurosciences M 6.8 CV ~20%
Sprague Hall M 7.2 VAV ~20%
Hewitt Hall M 8.7 VAV ~20%
Engineering Hall E 8.0 VAV ~30%
Averages 8.2 VAV ~20%
AFTER Smart Lab Retrofit
kWh Savings
Therm Savings
Total Savings
41% 60% 55%
40% 66% 47%
70% 76% 72%
48% 62% 50%
45% 81% 60%
46% 78% 62%
58% 81% 61%
58% 82% 71%
58% 77% 69%
59% 78% 61%
55% 76% 58%
Type: P = Physical Sciences, B = Biological Sciences, E = Engineering, M = Medical Sciences
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Page 198
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Future of Smart Labs at UC Irvine
Research and development of Smart Labs is an ongoing process that will continue to make our labs more energy efficient and safer. • Minimum Fume Hood Flow Study • LED Lighting System • New Lab Display Units
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Minimum Fume Hood Flow Study
• UC Irvine desires to reduce energy use in labs by minimizing the exhaust flow through VAV fume hoods when the sash is closed
• Evaluate whether exhaust flow can be safely reduced below current design flow of 25 cfm/ft2 of work surface
• Determine the min recommended exhaust flow for VAV hoods located throughout the UCI campus.
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AIHA/ANSI Z9.5 Laboratory Standard
• The new ANSI Z9.5 Standard recommends basing the minimum flow on the internal volume of the fume hood and internal air change per hour(ACH) where a range of 375 ACH to as low as 150 ACH is proposed
• 375 ACH is roughly equivalent to 25 cfm/ft2 and150 ACH is roughly equivalent to 10 cfm/ft2
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AIHA/ANSI Z9.5 Laboratory Standard
Safety Considerations: • The processes and materials generated within the
hoods • Hood containment and dilution of hazardous
concentrations within the hood • Potential for increased corrosion • The ability to measure and control flow • Effect on duct transport and stack discharge velocities
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Preliminary Test Results New Safe Flow Set Points
Current flow set point is 375 ACH
Minimum ACH for safe containment – ACH min
Flow reduction from design from 375 ACH
6 ft Hood A
5 ft Hood B
6 ft Hood C
5 ft Hood D
ACH Min 165 230 200 220
Flow Reduction - ACH 210 145 175 155
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Energy Savings
• To be determined over the next 6 to 12 months
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Implementation Plan
• Implement in one building • Full campus roll-out
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LED Lighting System • LED lights with integrated smart controls • Precisely control lighting levels • Occupancy, daylighting, and temperature sensors at
each fixture • Real-time energy management and reporting • Real-time monitoring of each fixture and group • Demand response capable
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LED lighting fixtures • Pendant Mount
• 2x2 or 2x4 • Can
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LED Lighting System
• Real time and historic monitoring
• Trend energy use • Failure Notfication
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Lab Display Units
UCI working with CalIT2 are developing a new LDU that displays – Ventilation Data – Environmental Health and Safety Hazard and Emergency Information – Energy Saving Tutorial
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Lab Display Units
Touchscreen Android based display Graphical output of any Bacnet point Capable of showing • Training videos • Chemical
inventories • Scheduling • Contact
information
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Page 211
Today’s Agenda
• Welcome and Introductions • UC Irvine’s Smart Labs Initiative • Introduction to Smart Labs • Prerequisites for Smart Labs • Submetering • Smart Labs Characteristics
– Building Envelope – Lighting
Participatory Exercise • BREAK
– Mechanical System • Centralized Demand
Controlled Ventilation • Lab Bench Top Risk
Assessment • Participatory Exercise
• Low-Flow Fume Hoods • BREAK • Exhaust Stack Discharge Volume
Reduction – Participatory Exercise
• Plug Load • Dashboards and Energy Savings • BREAK • Return on Investment and
Commissioning • The Future of Smart Labs • Conclusion and Wrap-Up
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Smart Lab Energy Design Parameters Parameters/Features Recent Best Practices Smart Lab
Air-handler/filtration airspeeds 400 ft./min. max. 350 ft./min. max.
Total system (supply + exhaust) pressure-drop ~6 in.w.g. <5 in.w.g.
Duct noise attenuators Few None
Occupied lab air-changes/hr. (ACH) 6 ACH 4 ACH w/contaminant sensing
Unoccupied air-change setback No setback 2 ACH w/contaminant sensing + reduced
thermal inputs while building “coasts” during setback
Low-flow/high-performance fume hoods and/or automatic sash-closers No Yes, where hood density warrants
Exhaust stack discharge velocity ~3,000 FPM
No fixed standard; building-by-building analysis typical
1,000-1,500 FPM >1,500 FPM only if/when necessary to
avoid re-entrainment
Lab illumination power-density ~.9 watt/SF <.6 watt/SF w/LED task lighting where needed
Fixtures near windows on daylight sensors No Yes
ENERGY STAR freezers and refrigerators Some Most
Outperform CA Title 24 20-25% >50%
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Smart Labs Summary
Reduce building energy consumption by ~50% Reduce air changes with CDCV Reduce illumination power density Reduce building exhaust discharge air speeds Increased staff oversight Increased mechanical repairs to more complex systems Increased software updates/adjustments to control
systems Increased EH&S oversight of labs Significant energy $avings
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Revisiting the Learning Outcomes
1. Why focus on laboratories? 2. Can we afford a “smart lab” retrofit? 3. Are savings greater than 50% really possible? 4. Can these savings only be realized with new
construction? 5. Can we afford to keep a “smart lab” smart? 6. What if our energy costs differ from those in
California?
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QUESTIONS? Wendell Brase Matt Gudorf Marc Gomez David Kang Fred Bockmiller
[email protected] [email protected] [email protected] [email protected] [email protected]