ASHRAE Guideline 36 Advanced HVAC Control Sequences
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1 ASHRAE Guideline 36 Advanced HVAC Control Sequences Rick Stehmeyer - Senior Engineer Matt Napolitan, P.E., CCP, CPMP, LEED AP BD+C - Principal Image Source:
2 Presentation Overview Guideline 36 is 176 pages. We will not cover EVERYTHING! GL 36 advocates for: Using technology, experience and science, even if it results in complexity, to reduce energy use. Using Closed Loop Controls Using the variable you are trying to control to inform your control system. Identifying potential problems before they become alarms.
3 Concepts in this Presentation Purpose and Scope of Guideline 36 Document Arrangement Zone Grouping and Control with Reheat Control Multizone AHU Mixing Box Control Closed Loop SAT Reset Using an Importance Multiplier and Heating and Cooling Requests SAT Trim and Respond Controls Network Architecture Smart Alarming FDD
4 4 Current State of Affairs
5 Efficiency Current State of Affairs 5 Equipment Life (Operational Hours)
6 6 Get outside the box. No really.
7 Current state of HVAC Design RAF EA RA N.C. VFD AI: RAT AO: ECON N.O. N.C. PF CC-1 SAF OA VFD AI: MAT DI: FRZ CHWS AI: SAT AO: HEAT CHWR N.O. AO: CHWV V-1 24 V-2 7
8 8 We ve always done it this way
9 9 The most dangerous phrase
10 BREAK THE CYCLE The same old thinking New thinking The same old results Different Results New Perspective 10
11 The 2030 Challenge We're a non-profit think tank transforming climate change problems into solutions through the design of the built environment
12 The 2030 Challenge
13 Energy Production in USA
14 Energy Production in USA 81% Net Carbon Emitters
15 Energy Consumption in USA
16 Energy Consumption in USA
17 The AIA Is On Board
18 ASHRAE Is On Board
19 Guideline 36
20 20 Air side systems only
21 Guideline 36 Field Verified
22 Guideline 36 Verified on the West Coast
23 Guideline 36 In New England
24 Guideline 36 In New England
25 Smart Application Minimal Additional Hardware
26 Guideline 36 Sequences are more complex and more involved than the status quo.
27 Document Arrangement Guideline 36 is a collection of sequences: Standardization is the goal Contains Definitions Point Layouts Sequences FDD
28 28 Guideline Overview and Systems
29 Designers and Implementers Working Together 29
30 30 PURPOSE!
31 31 Born out of research
32 32 Born out of research
33 33 Application
34 Starting Point AHU Zone Group Zones 34
35 35 Spaces? Zones?
36 36 Zone Control Characteristics
37 37 Zone Control Characteristics
38 38 Deviation from Status Quo
39 Simultaneous Heating and Cooling 39
40 This is what we always do, it works! 40
41 Deviation from Status Quo Cooling Set Point Deadband Room Temperature Deadband Heating Set Point Cooling Demand Heating Demand 41
42 42 Another Deviation from Status Quo
43 Grouping AHU Zone Group Zones 43
44 Grouping Zone Group 2 (Offices) Zone Group 1 (Processing) 44
45 with Reheat We are covering this because it is the most common piece of equipment The Guideline: Links the sequence to the Zone definition and zone Group definition Provides point layout
46 46 s!
47 47 s Covered
48 48 with Reheat
49 49 Important Inputs / Outputs
50 50 Here is why
51 51 Now in Color!
52 52 MAX Discharge ASHRAE 62.1
53 Logic is the beginning, not the end, of Wisdom. - Spock Room Temp Cooling Setpoint PID 0-100% Temp Demand Signal Damper Actuator Mr. Scott we need more power! Room Temp Heating Setpoint PID 0-50% Temp Demand Signal Heating Valve Damper Actuator 53
54 Grouping AHU Zone Group Zones 54
55 Multizone AHU Mixing Box Control The guideline provides some key differences that are important to know about. We will be covering mixing box control and supply air control There are other new control strategies that the guideline implements for multizone AHU s that we will not be covering today.
56 56 Mulitzone AHUs
57 57 Mulitzone AHUs
58 Deviation from Status Quo Individual Analog Outputs for each actuator on the economizer dampers! 58
59 Status Quo Mixing Box Control AHU SAT AHU SAT Set Point PID 0-100% Temp Demand Signal 25% Demand EAD 25% Open RAD 75% Open OAD 25% Open
60 Damper Position % Open Mixing Box Control Traditional 100 % RAD OAD EAD OA Minimum 0% 0% Supply Air Control Loop signal 100 %
61 GL36 Mixing Box Control AHU SAT AHU SAT Set Point PID 0-100% Temp Demand Signal 25% Demand EAD 100% Open RAD 100% Open OAD 25% Open
62 62 New Mixing Box Control
63 63 Mixing Box Control with AFMS
64 RP-1455 Supporting Data Source: 4/19/2016 Seminar at PEC 64
65 Example S.Q. Mixing box PID 0-100% 0% Temp Demand Signal 20% Open Return Fan EA 80% Open CC-1 Supply Fan OA 20% Open 65
66 Example S.Q. Mixing box PID 0-100% 60% Temp Demand Signal 60% Open Return Fan EA OA 40% Open 60% Open CC-1 Supply Fan Call for Cooling Drop in SAT 66
67 Example GL36 Mixing box PID 0-100% 60% Temp Demand Signal 100% Open Return Fan EA OA 80% Open 100% Open CC-1 Supply Fan Call for Cooling Drop in SAT 67
68 68 GL36 Building Pressure Control
69 69 No Building pressure Control?
70 Guideline 36 vs Status Quo Mixing Box Control Status Quo Dependent Damper Control
71 Guideline 36 vs Status Quo Mixing Box Control Status Quo Dependent Damper Control
72 Guideline 36 vs Status Quo Mixing Box Control Status Quo Dependent Damper Control
73 Guideline 36 vs Status Quo Mixing Box Control Status Quo Dependent Damper Control
74 Multizone AHU Supply Air Control How is GL 36 Different? We just saw changes in mixing box control The GL uses space demand to inform the AHU supply air temp. Not OAT. Space demand is weighted to better reflect the demand's potential impact on the system.
75 OAT Guideline 36 vs Status Quo SAT Control Status Quo OAT Reset (Maybe) 70 F 35 F 55 F 75 F Air Handler Discharge Air Set Point
76 Guideline 36 vs Status Quo SAT Control Status Quo OAT Reset (Maybe)
77 Guideline 36 vs Status Quo
78 Guideline 36 vs Status Quo SAT Control Status Quo
79 Guideline 36 vs Status Quo SAT Control GL 36
80 Open vs Closed Loop Control This is a key concept to bringing modern day control to life Being able to identify open / closed loop control is essential to understanding why they implemented some of these sequences Lets talk about it in terms of Supply air temperature reset
81 Status Quo Open Loop SAT Reset OAT AHU SAT SPACE TEMP
82 Open Loop No Feedback OAT AHU SAT SPACE TEMP TRYING TO CONTROL THIS
83 Open Loop No Feedback OAT AHU SAT SPACE TEMP BY RELYING ON THIS INPUT TRYING TO CONTROL THIS
84 Open Loop No Feedback OAT AHU SAT SPACE TEMP THE LOOP IS OPEN (BROKEN) BY RELYING ON THIS INPUT TRYING TO CONTROL THIS
85 Open Loop at Home Clothes Dryer is Open Loop Heat Setting plus Timer = Hopefully Dry
86 Closed Loop at Home Refrigerator is Closed Loop Too Warm Inside, Turn on the Compressor
87 Status Quo Open Loop SAT Reset OAT Determines SAT OAT AHU SAT SPACE TEMP
88 How to Close the Loop OAT AHU SAT SPACE TEMP
89 Guideline 36 Closed Loop SAT Reset SAT Control GL 36 Heating / Cooling Requests Closed Loop AHU SAT SPACE TEMP
90 Importance Multiplier SAT Control GL 36 Heating / Cooling Requests Closed Loop SPACE DMD SPACE DMD AHU SAT SPACE DMD SPACE DMD
91 Importance Multiplier SAT Control GL 36 Weighted Heating / Cooling Requests Closed Loop SPACE DMD! X AHU SAT SPACE DMD SPACE DMD! X! X SPACE DMD! X Importance Multiplier
92 Importance Multiplier SAT Control GL 36 Weighted Heating / Cooling Requests Closed Loop SPACE DMD! X AHU SAT SPACE DMD SPACE DMD! X! X SPACE DMD! X Importance Multiplier
93 Guideline 36 vs Status Quo SAT Control GL 36 Weighted Heating / Cooling Requests Closed Loop SPACE DMD! X AHU SAT SPACE DMD SPACE DMD! X! X SPACE DMD! X Importance Multiplier
94 Guideline 36 vs Status Quo SAT Control Status Quo 1) Supply air temperature will be reset proportionally based on the outside air temperature per the following schedule: OAT SAT
95 Guideline 36 vs Status Quo SAT Control GL 36 Importance Multiplier Example 1) Supply air temperature will be reset using a weighted heating and cooling request and response. A PID will handle the response portion to the summed heating and cooling requests where: 1) Heating and cooling requests cancel each other out. 2) The heating/cooling request value is calculated as the difference between room and overage of the current heating or cooling set point as seen in Figure 3 - Heating Cooling Request Graph (Zone level Logic). A pseudo logical block diagram of this can be found in ATC ) The request value is multiplied by the design CFM of the box. This multiplication is called an importance multiplier and will be referenced in other sequences. 4) The result of the multiplied value is then summed with all the other requests from all the other s. 5) The result of that summation is then divided by the discharge total CFM provided by the AHU. 6) The result of the division is then used as the input of a PID with a fixed set point of zero. This result may be multiplied by 10 or 100 if required by the specific PID being used. The PID shall be configured in such a way that the loop will output 50% when its input is equal to set point (or PID Bias will equal 50%). 7) The result of the PID is then used as the input of a linear reset. This reset shall use the PIDs output range (0-100) to reset the supply air temperature set point between SAT-min and SAT-max. 8) The calculated supply air temperature set point shall be able to be overridden at the user interface.
96 Importance Multiplier in Action SPACE DMD! X SPACE DMD SPACE DMD! X! X SPACE DMD! X Importance Multiplier
97 Importance Multiplier in Action Space Demand Importance Multiplier
98 Importance Multiplier in Action Space Demand Importance Multiplier Demand Sent to AHU
99 Importance Multiplier in Action One Step Further Include CFM Space Demand Importance Multiplier Space Design CFM
100 Importance Multiplier in Action One Step Further Include CFM Space Design CFM Space Demand Importance Multiplier
101 Importance Multiplier in Action One Step Further Include CFM Space Design CFM Space Demand Importance Multiplier Demand Sent to AHU
102 Importance Multiplier Quick Review GL 36 uses an integer importance multiplier. Requires user / designer input Allows for future modification Can default to 1 for all zones at turnover We suggest including the zone design CFM. Implementer has this information readily available Direct reflection of zone s potential demand on AHU
103 First the Zones AHU SAT SPACE TEMP
104 Now the AHU AHU SAT SPACE TEMP
105 Trim and Respond
106 Trim LOWER STATIC SETPOINT FAN SPEED DROPS CFM DROPs WAIT X MINUTES
107 Trim LOWER STATIC SETPOINT FAN SPEED DROPS CFM DROPs Damper Opens
108 Trim Requests more static LOWER STATIC SETPOINT FAN SPEED DROPS CFM DROPs WAIT X MINUTES
109 and Respond Requests more static Requests more static
110 Respond INCREASE STATIC SETPOINT FAN SPEED RAISES CFM INCREASES WAIT X MINUTES
111 Trim and Respond
112 From the Horse s Mouth
113 Guideline 36 vs Status Quo Trim and Respond Lot s O Variables
114 Network Traffic Guideline 36 is a collection of sequences, and doesn t give much guidance in terms of the controls network All these new sequences create more dependency on a fully networked control system Therefore, it s important to discuss the network architecture when talking about implementing the guideline.
115 Controls Network Architecture 115
116 Controls Network Architecture LAN / Internet / Cloud SERVER PC GLOBAL AHU-1 EXH. FAN AHU-2 116
117 Controls Network Architecture Enterprise / Campus Level Building Level Equipment Level Zone Level SERVER PC GLOBAL AHU-1 AHU-2 EXH. FAN 117
118 Controls Network Architecture Enterprise / Campus Level SERVER PC GLOBAL Has Ethernet Has RS-485 Building Level AHU-1 Has Ethernet, Has Modbus, Attached to meters AHU-2 Equipment Level Zone Level EXH. FAN End Device Sensor Actuator Relay Lights 118
119 119 Controls Network Architecture
120 120 Controls Network Architecture
121 121 Controls Network Architecture
122 122 Controls Network Architecture
123 123 Controls Network Architecture
124 Controls Network Architecture LAN / Internet / Cloud SERVER PC GLOBAL AHU-1 EXH. FAN AHU-2 124
125 Controls Network Architecture LAN / Internet / Cloud SERVER PC AHU-1 GLOBAL EXH. FAN AHU-2 125
126 126 If it ain t broke
127 Why Is this important? LAN / Internet / Cloud SERVER PC GLOBAL AHU-1 EXH. FAN AHU-2 127
128 Why Is this important? LAN / Internet / Cloud SERVER PC GLOBAL AHU-1 EXH. FAN AHU-2 128
129 Why Is this important? LAN / Internet / Cloud SERVER PC GLOBAL AHU-1 EXH. FAN AHU-2 129
130 Controls Network Architecture LAN / Internet / Cloud SERVER PC AHU-1 GLOBAL EXH. FAN AHU-2 130
131 Controls Network Architecture LAN / Internet / Cloud SERVER PC AHU-1 GLOBAL EXH. FAN AHU-2 131
132 132 You can no longer not know that
133 Network Architecture Quick Review GL 36 sequences require more network traffic that usual ASHRAE GL 13 architecture limits failure impact Easy to implement, requires planning Collaborate with your implementer (this may be new to them). Yes Traffic is increased, however, not beyond the capacity of a modern day control system using a industry standard open communications protocol.
134 Efficient Alarming
135 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
136 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
137 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
138 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
139 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
140 Traditional Alarming Alarming Status Quo Alarm Everything AHU Chiller Pump AHU
141 How do we Prevent the Unnecessary Alarms?
142 Use a Hierarchy Alarming GL 36 Hierarchical Alarming There s always a bigger fish
143 Use a Hierarchy Alarming GL 36 Hierarchical Alarming Source Load
144 Remember This? AHU Chiller Pump AHU
145 Source Alarms Suppress Load Alarms Alarming GL 36 Hierarchical Alarming AHU Chiller Pump AHU
146 Source Alarms Suppress Load Alarms Alarming GL 36 Hierarchical Alarming AHU Chiller Pump AHU
147 Source Alarms Suppress Load Alarms Alarming GL 36 Hierarchical Alarming AHU Chiller Pump AHU
148 Source Alarms Suppress Load Alarms Alarming GL 36 Hierarchical Alarming AHU Chiller Pump AHU
149 Smart Alarming Quick Review Guideline 36 provides a source / load alarm relationship Creates significantly fewer alarms in the system Makes the system more time efficient from a troubleshooting perspective Aims at using a bit more logic to inhibit alarms intelligently No more boy cried wolf alarm logs
150 Fault Detection and Diagnostics
151 Fault Detection and Diagnostics
152 Fault Detection and Diagnostics Fault Detection and Diagnostics Defined in GL 36 as: Assessing equipment performance
153 Fault Detection and Diagnostics Fault Detection and Diagnostics Defined in GL 36 as: Assessing equipment performance By comparing BAS inputs and outputs
154 Fault Detection and Diagnostics Fault Detection and Diagnostics Defined in GL 36 as: Assessing equipment performance By comparing BAS inputs and outputs To potential fault conditions
155 Fault Detection and Diagnostics Fault Detection and Diagnostics Defined in GL 36 as: Assessing equipment performance By comparing BAS inputs and outputs To potential fault conditions
156 Fault Detection and Diagnostics Fault Detection and Diagnostics A Binary Comparison PASS / FAIL
157 FDD Implementation Equipment Operating State (OS) Operating State Heating Valve Position Cooling Valve Position Outdoor Air Damper Position #1: Heating >0 =0 =MIN #2: Economizer Cooling, Modulating OA =0 =0 Min < X <100% #3: Mechanical + Economizer Cooling =0 >0 =100% #4: Mechanical Cooling + Min OA =0 >0 =MIN #5: Unknown or Dehumidification No other OS applies
158 FDD Implementation Variable Definition Variable Name Description Default Value ΔT SF Temperature rise across supply fan 2 F ΔT MIN Minimum difference between OAT and RAT to evaluate economizer error 5 F conditions θ SAT Temperature error threshold for SAT sensor 2 F θ RAT Temperature error threshold for RAT sensor 2 F θ MAT Temperature error threshold for MAT sensor 2 F θ OAT Temperature error threshold for OAT sensor 2 F θ F Airflow Error threshold 3% θ VFD SPD VFD Speed Error threshold 5% θ DSP Duct static pressure error threshold 0.2" ΔOS Max Mode Delay Maximum number of changes in Operating State Time in minutes to suspend fault condition evaluation after a change in operating state Alarm Delay Time in minutes that a fault condition must persist before triggering an alarm 60
159 FDD Implementation - AHU Example Supply Air Temperature Fault (operating state)
160 FDD Implementation - AHU Example Mixed Air Temperature Fault Equation MAT AVG - θ MAT > MAX [(RAT AVG - θ RAT ), (OAT AVG - θ OAT )] FC #3 Description MAT too high; should be between OAT and RAT RAT sensor error Possible MAT sensor error Diagnosis OAT sensor error Applies to: OS #1- #5
161 FDD Implementation - AHU Example Mixed Air Temperature Fault MAT AVG - θ MAT > MAX [(RAT AVG - θ RAT ), (OAT AVG - θ OAT )] Variable Name Example Value RAT AVG 68 F MAT AVG 52 F OAT AVG 28 F θ RAT 2 F θ MAT 1 F θ OAT 2 F
162 FDD Implementation - AHU Example Mixed Air Temperature Fault MAT AVG - θ MAT > MAX [(RAT AVG - θ RAT ), (OAT AVG - θ OAT )] Variable Name Example Value RAT AVG 68 F MAT AVG 52 F OAT AVG 28 F (52-1) > MAX [(68 2), (28-2)] θ RAT 2 F θ MAT 1 F θ OAT 2 F
163 FDD Implementation - AHU Example Mixed Air Temperature Fault MAT AVG - θ MAT > MAX [(RAT AVG - θ RAT ), (OAT AVG - θ OAT )] Variable Name Example Value RAT AVG 68 F MAT AVG 52 F OAT AVG 28 F θ RAT 2 F θ MAT 1 F θ OAT 2 F (52-1) > MAX[(68 2), (28-2)] Is (51) > (66)? No, No Fault
164 FDD Implementation - AHU Example Mixed Air Temperature Fault MAT AVG - θ MAT > MAX [(RAT AVG - θ RAT ), (OAT AVG - θ OAT )] Variable Name Example Value RAT AVG 68 F MAT AVG 71 F OAT AVG 28 F θ RAT 2 F θ MAT 1 F θ OAT 2 F (71-1) > MAX[(68 2), (28-2)] Is (70) > (66)? YES, Fault (But no Alarm!)
165 FDD Implementation Using the Inputs Average Temperatures From the GL (and in your specs) The following values must be continuously calculated by the FDD routines for each AHU: There is a LONG list. This is just a small portion of it.
166 FDD Implementation Using the Inputs Average Temperatures From the GL (and in your specs) The following values must be continuously calculated by the FDD routines for each AHU: Five minute (default) rolling averages, one minute samples of the followings point values; operator shall have the ability to adjust the averaging window and sampling rate for each point independently SAT AVG = rolling average of supply air temperature MAT AVG = rolling average of mixed air temperature RAT AVG = rolling average of return air temperature OAT AVG = rolling average of outdoor air temperature DSP AVG = rolling average of duct static pressure
167 In conclusion
168 168 Questions?
169 Thank You for attending! Rick Stehmeyer - Senior Engineer Matt Napolitan - Principal
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