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Presented by:Ken Gilbert, LEED APRegional Technical ConsultantAutomated Logic Corporation

April 9, 2020

ASHRAE Guideline 36High Performance Sequences of Operations

for HVAC Systems

CONTINUING EDUCATION CREDITS

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HIGH PERFORMANCE SEQUENCESObjectives:What is ASHRAE Guideline 36

What are High Performance Sequences of Operations (HPSOO)

What are the benefits of high performance sequences of operation?

How to specify high performance sequences of operation for ASHRAE Guideline 36

The future of ASHRAE Guideline 36

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ASHRAE GUIDELINE 36 High Performance Sequences of Operation(HPSOO)

The purpose is to provide uniform SOO for HVAC systems

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ASHRAE GUIDELINE 36 ASHRAE Guideline 36 Scope Goals of ASHRAE Guideline 36 The Guideline is organized into Five Main Sections

1. Purpose2. Scope3. Setpoints, Design, and Field Determined4. List Hardwired Points5. Sequences of Operations

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ASHRAE GUIDELINE 36 ASHRAE Guideline 36-2018 only includes air side HVAC equipment The Air Side HPSOO include single zone VAV AHUs, multi-zone VAV

AHUs, and VAV terminal units including single duct, dual duct, and fan powered

Chilled Water and Hot Water Systems coming The Chilled water side HPSOO will include chilled water distribution,

chiller configuration, chiller types, waterside economizers, pump configurations, and heat rejection

Hot water side HPSOO will include hot water distribution, boiler types, and primary pump configuration

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ASHRAE GUIDELINE 36 ASHRAE Guideline 36 desired implementation includes:

- The committee continues to create and update HPSOOs

- Engineers specify ASHRAE Guideline 36 HPSOOs

- Controls Vendors preprogram, test, and debug sequences

- Controls Technicians use the tested programs

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WHAT ARE HPSOO Sequences developed for both air side and water side applications

Standardized sequences to be implemented in both heating and cooling systems

HPSOO are standardized sequences that are repeatable

Sequences implemented to maximize energy efficiency and performance by defining relationships

These sequences leverage the capability of today’s DDC systems

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AIR SIDE HPSOO

Requires VAV Zones to be put into groups that then determine a mode

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AIR SIDE HPSOO

Zone Mode Set Points

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AIR SIDE HPSOO Provide detailed SOO on how to implement “dual maximum” VAV

logic

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AIR SIDE HPSOO

Implementation of a dynamic demand control ventilation sequence

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AIR SIDE HPSOO

Terminal Unit Schedule

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Without DCV

Tag

Inlet

Airflow Setpoints(CFM)

Cooling Heating Minimum

VAV-1 6 385 265 75

VAV-2 8 770 340 155

VAV-3 5 295 95 110

With DCV

Tag

Inlet

Airflow Setpoints(CFM) Ventilation Parameters Sensors

Cooling Heating CFM/FT2 Area CFM/Person People CO2 Occupancy

VAV-1 6 385 265 0.06 367 5 2 N Y

VAV-2 8 770 340 0.06 400 5 3 N Y

VAV-3 5 295 95 0.06 267 5 14 Y N

AIR SIDE HPSOO

Typical Single Duct VAV with Reheat Flow Diagram

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AIR SIDE HPSOO

Allows the use of time-averaged ventilation(TAV)

Implementation of trim and respond(T&R) logic for AHU static pressure reset

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Trim & Respond VariablesVariable Definition

Device Fan, Pump, Etc.SP0 Initial SetpointSpmin Minimum SetpointSpmax Maximum SetpointTd Delay TimerT Time StepI Number of Ignored RequestsR Number of RequestsSPtrim Trim AmountSPres Respond AmountSPres-max Maximum response per time interval

AIR SIDE HPSOO

Use of T&R logic for AHU discharge air temperature reset

Alarming and hierarchical alarm suppressionFour Alarm Levels- Level 1: Life Safety Message- Level 2: Critical Equipment Message- Level 3: Urgent Message- Level 4: Normal Message

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AIR SIDE HPSOO Hierarchical Alarm Suppression

- Important to define relationships of equipment in terms of source and dependent

- Each relationship must be defined separately for heating, cooling, and air flow

Automatic Fault Detection and Diagnostics (AFDD)

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AIR SIDE HPSOO AHU Performance Assessment Rules (APAR)

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AIR SIDE HPSOO There are fifteen Fault Conditions (FC)

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AIR SIDE HPSOO The purpose of AFDD is to minimize false alarms

- Assumes typical sensor error

- Uses rolling averages to smooth spikes

- Suspends evaluation with change in operating state

- Condition must be true for a specified time period before an alarm is reported

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BENEFITS OF HPSOO

Benefits to Engineer- Pre-written and tested sequences of operations- Since ASHRAE Guideline 36 is under continuous monitoring, engineers

can be sure the latest, greatest HPSOOs are implemented as well as compliance with the most current standards and codes.

Benefits to Owner- Building operates with better energy efficiency and IAQ- Improves reliability and ease of operation- Reduced installation costs

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BENEFITS OF HPSOO

Benefits to Controls Contractor- Improves collaboration between engineer, installer, and operator - Reduces engineering and programming time- Reduces errors and misinterpretations of HPSOOs- Reduces commissioning time

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HOW TO SPECIFY Building owners/operators and controls contractors need to demand

HPSOOs as outlined in ASHRAE Guideline 36 Engineer needs to state “control sequences shall fully implement and

be in accordance with ASHRAE Guideline 36 per section 5.7”. One other specification suggestion is the requirement to furnish

documentation the HPSOOs have been preprogrammed and tested by the Controls Vendor to meet ASHRAE GL36.

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FUTURE OF ASHRAE GUIDELINE 36 Implementation of RP-1711 to include HPSOOs for hydronic systems

GL36 will eventually include functional performance tests(FPTs)

Inclusion of RP-1587 Control Loop Performance Assessment

TRP-1865 Optimizing Supply Air Temperature Control for DOAS

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KEY TAKEAWAYS The current ASHRAE Guideline 36 only includes HPSOOs for VAV

Air Systems

The primary benefits include- SOOs that are Easier to specify for Engineer-Improved energy efficiency and building operation for owner-Easier implementation for controls contractor

ASHRAE GL36 is not static and will always be improving by adding additional systems, and requirements to enhance the HPSOOs

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WRAP UP

Questions?

Feedback?

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