vrf systems for school applications - fefpa in... · · 2017-03-12vrf systems for school...

VRF Systems forSchool Applications

name

title– Lennox Industries

1005B065A

• What is VRF?

• Why VRF in Schools?

Energy Efficiency

Design Flexibility

Cost Effective Installation

Occupant Environment

Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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VRF Technology

HVAC Parallel Efficiency Progress

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• VRF – Variable Refrigerant Flow

• System Components:

What is VRF?

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Condensing Units

Mode Selection Box

Indoor Units

Controls & Acc.

What is VRF?

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Variable Speed Capacity • All-inverter compressors

• No Locked Rotor Amps or Maximum Starting Current

• Reduced wear and tear extends life

• Reduced sound levels

• Energy efficiency

VRF Heat Pump

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Cooling or Heating

Cooling Mode

Heating Mode

VRF Heat Recovery

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Simultaneous Cooling AND Heating

The MS Box

Hot Gas

Liquid

Suction

Suction

Liquid

Hot Gas

Liquid

SuctionLiquid

Hot Gas

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What is VRF?

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Three Pipe Refrigerant Circuit

Two Pipe Refrigerant

Circuit

Large Conference

Open Office PlanOffice Office

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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• Inverter compressor

• Simultaneous cooling and heating

• No water circulating pumps

Energy Savings

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Four-Pipe Application

VRF Application

• System Diversity

VRF Energy Efficiency

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• Heat Recovery


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• VRF energy model simulation for school

o Single Story

o 82,000 square feet

o Comparison: VRF, WSHP, VAV Rooftop, 4-Pipe Hydronic

o Classrooms, Administrative, Labs, Gym, Locker Rooms, Labs and Theater

o Various Climate Regions

oAtlanta, Miami, Boston, New York, Chicago, Dallas, Los Angeles, Seattle

o Utility rates were used based on historic data per region


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Source: EnergySoft Building Analysis – Energy Pro Modeler


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$0

$50,000

$100,000

$150,000

$200,000

$250,000

Atlanta Miami Boston NYC Chicago Dallas L.A. Seattle

VRF VAV WSHP 4-Pipe

Total Energy Cost ComparisonUp to 33% less

Source: EnergySoft Building Analysis – Energy Pro Modeler

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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Design Flexibility

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Design Flexibility

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Indoor Units

Wall Mount 2x2 Ceiling Cassette

3x3 Ceiling Cassette Ceiling/Floor Mounted

Medium Static High StaticVertical/Horizontal

Non Ducted

Ducted

• Modular system design approach

Design Flexibility

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07 09 12 15 18 24 30 36 48 54 72 96

6 8 10 12 14 16 18 20 22 24 26 28 36

HR

HP

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VRF and Existing Buildings

• Less intrusive to existing architecture

• Small refrigerant piping instead of large ductwork

• Outdoor installation flexibility

Design Flexibility

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Existing Hydronic Piping

Abandoned in place

New VRF

System Piping

• Traditional systems require space for pumps, boilers, chillers, ducts, piping, heat exchangers

• VRF systems free up space and modular design are easily blended into design

Reclaimed Design Space

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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• Equipment handling – no cranes (fits in standard freight elevator), less weight on roof

• Small footprint/modular – eliminate need for equipment room (more usable space)


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Scalable system capacity

Smaller wire sizes and disconnects


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2 amps

• R410A Vs Water

8.9 Btu/h per lb vs. 85 Btu/h per lb -> 10x more effective

• R410A Vs Air

0.48 Btu/h per lb vs. 85 Btu/h per lb -> 170x more effective


30Cross sectional area. Does not include duct or pipe insulation

Typical 20 Ton System

28.27 in2

10 X Larger

8.9 Btu/h per LB

2.82 in2

85.4 Btu/h per LB

800 in2

284 X Larger

0.48 Btu/h per LB

40” X 20”

Rectangular Duct

24”

4-Pipe Chiller/Boiler

(Four 3” Pipes)

3-Pipe VRF

Heat Recovery

(Suct.-1.25”,

Disch.-1.125”,

Liq.-.875”)

• Average equipment weight per ton for VRF is 70 lbs per ton (outdoor unit only)

• Average equipment weight per ton for water-cooled chiller is 101 lbs per ton

VRF Equipment Weight Savings

31% reduction in equipment weight80 Ton System

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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• Each VRF Indoor Unit has its own electronic expansion valve (EXV)

• Each IDU makes a system capacity demand based setpoint/room temp differential


Independent Operating

Mode per Port

Similar Load Profiles Can

Share A Port

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• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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1. IDU filter cleaning

2. Annual ODU coil cleaning

-----------That’s it!------------

• NO belt maintenance - Direct drive

• Single 6/8/10 ton compressor SKU – in stock

• Single manufacturer, single source responsibility

• Self-diagnostic, alpha numeric error code generation

• Emailed and/or text message error alerts to maintenance staff

Virtually No Maintenance

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Life-cycle Costs

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Four-Pipe System

0 1 2 3Life of System

VRF System

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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Ease of Control

Local / Remote CentralizedGateways /

BMS

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Comfort Controls

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Total comfort control by each individual/zone

Comfort Controls

Centralized Controller

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On/Off

Fan Speed

Setpoint

Mode

BACnet LON Works

Multiple Buildings on Campus

• What is VRF?


Energy Efficiency

Design Flexibility



Ease of Maintenance

Ease of Control

• Wrap up

VRF in Schools

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• VRF is the most comfortable technology on the market, due to variable capacity indoor units, variable speed outdoor units

• Systems are available as Heat Pump and Heat Recovery

• VRF is a globally proven technology for 30+ years

• Highly energy efficient – Energy can recovered and recycled

• Application flexibility

• Maintain consistent space temperature for better felt comfort

• Low sound levels – great for classrooms

• Local and centralized control – campus wide control, local lockouts

Wrap Up

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vrf systems for school applications - fefpa in... · · 2017-03-12vrf systems for school...

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