PGE Wireless Pneumatic Thermostat ET Final Report.pdf

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PG&E’s Emerging Technologies Program ET11PGE3171 PILOT SITE #2 LOCATION AND SITE INFORMATION: Oakland, CA 94612 Multi-tenant office 200,000 sq ft, 9 stories CEC Climate Zone 3 M-F, 6 am to 6 pm operation Annual kWh usage: 1,891,000 Annual therms usage: 24,000 Installed 190 WPT units (Manufacturer 1) MECHANICAL SYSTEMS: Cooling Source: 100-ton air-cooled chillers, 2 units Heating Source: 3,280 kBtu/hr hot water boiler Air Distribution: 80,000 cfm VAV air handlers w/o economizers, 2 units. There is minimal return air, so the systems are essentially 100% outside air. Fan-powered boxes along perimeter of building provide additional heating at zone level. PROJECT INITIATION: The Oakland Shines program initiated this project and provided an incentive as well as project management assistance. The project intended to reduce energy consumption. The site installed 190 WPTs, replacing all of the existing pneumatic thermostats in the building’s core but left some existing digital thermostats that control perimeter reheat fan coils. The project scope also included the installation of a new BMS (Johnson Controls Facility Explorer System) for central systems. PLANNED EE MEASURES: The following list of planned measures is based on discussions that we had with the site staff before the installation occurred. Shutting down airflow to unoccupied (vacant) zones SAT reset DSP reset Deadband INSTALLED EE MEASURES WPT ENABLED DSP reset based on average zone temperatures only Cooling stage lockouts 32
PG&E’s Emerging Technologies Program ET11PGE3171 NON-WPT ENABLED Pre-Heat Temperature Reduction: The pre-heat air temperature was reduced to 67°F. Boiler Temperature Reset: A heating hot water temperature reset strategy was added with the new central BMS. MEASURE SUMMARY TABLE: The following table shows the measures for this pilot site based on category and at different project stages. Table 8: Pilot Site 2 – Measures Pilot Site 2 Savings potential: good some little/none Measures: Scheduling SAT Reset DSP Reset Deadband Proposed Installed WPT Attributable FINDINGS Set office schedule Closed unoccupied zones Closed unoccupied zones Currently fixed, plan on install Not implemented Not implemented Will implement, new DSP sensors Based on average building temperature Tenants control setpoint, 70 to 74 Yes, currently none No, single setpoint No, single setpoint 1. A DSP reset was implemented based on average building temperature. This average temperature is obtained from averaging all the zone temperatures reported by the WPTs throughout the building. It does not, however, use the detailed WPT zone demand information (pneumatic signal) to determine the level/quantity of calls for heating and cooling. 2. The new BMS integrated two cooling stage lockouts, which were previously controlled manually. These lockouts are based on both the outdoor air temperature and the average zone temperature. 3. When we conducted our post-installation monitoring, no zones had been scheduled off or unoccupied. 4. The site installed single-setpoint thermostats rather than the deadband model. 5. The occupants were given control of the thermostat setpoint, rather than it being set by the building operation staff. The occupants have control in the range of 70-74°F. According to site staff, the occupants have expressed that their comfort has improved greatly since the installation. 6. The site reduced their pre-heat supply air temperature setpoint. This adjustment remains a manual setting rather than an automated, controlled value. This is partially attributable to the installation of WPTs because the building engineer is able to observe the space temperatures of the building as he adjusts this setpoint. 33 Setpoint Enforcement Have full control, will limit Occupants have control Occupants have control DR: GTA (incl Pre- Cooling) Nothing planned N/A N/A RCx Other 1 year of proactive bldg operator Yes, generated a punchlist 40 boxes to check N/A Pre-heat setpoint reduction Could see zone response to preheat adjust
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PGE Wireless Pneumatic Thermostat ET Final Report.pdf

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