PGE Wireless Pneumatic Thermostat ET Final Report.pdf

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PG&E’s Emerging Technologies Program ET11PGE3171 PILOT SITE #1 LOCATION AND SITE INFORMATION: Oakland, CA 94607 Mixed office, court, and vacant holding cells 100,000 sq ft, 4 stories CEC Climate Zone 3 M-F, 4am to 6pm operation Annual kWh usage: 648,500 Annual therms usage: 45,000 Installed 42 WPT units (Manufacturer 1) MECHANICAL SYSTEMS: Cooling Source: 220-ton chiller Heating Source: Steam boiler Air Distribution: Dual duct, single fan VAV, 1 air handler Variable dual-damper terminal units PROJECT INITIATION: This project started out as part of an Automated Demand Response (ADR) project. The original objective of the project was to give the customer the ability to shut off load during demand response events. Although the ADR project costs were covered through PG&E and DOE incentive programs, the WPT portion of the project was not covered and was, therefore, paid for by the site. This site installed 42 WPTs, covering the entire building. The site had ADR controls installed concurrently with the WPT project. PLANNED EE MEASURES: The following list of planned measures is based on discussions that we had with the site staff before the installation occurred. Zone-level scheduling DSP reset Deadband Global temperature adjustment, demand response INSTALLED EE MEASURES WPT ENABLED Cold deck supply air temperature (CD SAT) Reset: A secondary input to the CD SAT was modified to include the average zone temperature from the WPTs. The primary SAT reset is determined by the outside air temperature in both the baseline and post-retrofit cases. 20
PG&E’s Emerging Technologies Program ET11PGE3171 Deadband: A deadband between separate cooling and heating zone temperature setpoints was installed. A 4°F deadband was initially installed, but the building operators adjusted the setpoints based on occupant feedback. We observed an average deadband of 2.3°F. Occupants can also override the setpoints on a temporary basis. NON-WPT ENABLED Duct static pressure (DSP) reset was programmed based on outside air temperature (OAT). The DSP reset is not based on zone data from the WPTs. MEASURE SUMMARY TABLE The following table shows the measures for this pilot site based on category and at different project stages. Table 5: Pilot Site 1 - Measures Pilot Site 1 Savings potential: good some little/none Measures: Scheduling SAT Reset DSP Reset Deadband Proposed FINDINGS Some improvement expected Some DDC w temp sensors, already SAT Installed No Already had WPT Attributable No Slight secondary, no change 1. The customer installed a slight, secondary (+1°F) adjustment to the cold deck temperature based on average of WPT zone temperatures. The primary input to the SAT reset is the outdoor air temperature; this was unchanged from the baseline to post-retrofit case. Prior to WPT installation, the secondary adjustment was based on the average of a few digital temperature sensors throughout the building. Since both pre- and post-retrofit secondary adjustment was based on building temperatures, the change in operation from this programming modification was negligible. 2. The thermostats were installed with a 4°F deadband, but the site staff adjusted both the setpoints and the range based on occupant feedback. 3. We found that the upper deadband limit varied from 69°F to 75°F, with an average of 72.7°F. The lower deadband limit varied between 67°F and 74°F, with an average of 70.4°F. The deadband amount varied between 1°F and 4°F, with an average of 2.3°F. 21 Setpoint Enforcement Yes, expected Interested in this Blank face DSP reset based on OA Based on OA, not zone information Observed average 2.3° Yes, average 70.4 to 72.7 DR: GTA (incl Pre- Cooling) Signed EnerNOC DR contract RCx Other Want to run more efficiently N/A N/A Integration issue None noted N/A Private office occupants have control Incompatable integration Future potential for MBCx N/A
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PGE Wireless Pneumatic Thermostat ET Final Report.pdf

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