PGE Wireless Pneumatic Thermostat ET Final Report.pdf

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PG&E’s Emerging Technologies Program ET11PGE3171 ASSESSMENT OBJECTIVES The three main objectives of this report are to: Test the reliability and functionality of WPT retrofit technology for building HVAC systems with existing pneumatic zone controls; Collect operational information and data to develop energy use simulation models for such projects; Determine the feasibility of offering a hybrid deemed rebate program for this technology. To this end, we selected four pilot sites to monitor the installation of WPTs. We conducted measurement and verification (M&V) at each site before and after the WPT installation. We collected data from both the central plant and sample zones at each site. We also conducted interviews with site staff at each location. The M&V data was used to develop energy savings calculations and temperature bin simulations (spreadsheet models) to model and quantify the energy savings. Methodology is discussed further in the Technical Approach section of this report. 10
PG&E’s Emerging Technologies Program ET11PGE3171 TECHNOLOGY/PRODUCT EVALUATION PRODUCT AND SITE SELECTION There are two manufacturers of WPTs and both were included in our study: three pilot sites with WPTs from one manufacturer and a single site with WPTs from the second. We opted to assess the technology in the field rather than the lab because the enabled energy savings measures are varied and site dependent. A controlled lab approach would have been more appropriate if the energy savings means were straightforward and broadly applicable. However, WPTs enable a variety of measures and we wanted to include in our study how sites select and implement various measures through the retrofit process. We chose to include test sites that were proceeding with a WPT retrofit on their own means, rather than to control the entire retrofit ourselves, so that we could assess the market opportunity and adoption of WPTs. We identified and selected sites based on leads from WPT manufacturers and third party incentive programs. We sought sites that would represent as many geographical areas in PG&E territory as possible. However, we had a limited number of choices to select from based on the leads from manufacturers. We had originally intended to monitor five pilot sites, but did not find a fifth site that offered any substantial differentiation in geography or planned measures. Of the four pilot sites, two were in Oakland, one was in San Mateo (San Francisco Peninsula), and one was in Sacramento. It should be noted that all pilot sites had some form of financial assistance for project costs. Two of the four pilot sites selected received ARRA funding for the retrofits. The third site had applied for On Bill Financing through PG&E and the fourth site was part of a Smart Grip Investment Project through Sacramento Municipal Utility District (SMUD) which covered 50% of project implementation costs. All four sites had applied for an incentive through PG&E’s CRI program. (The Sacramento site is eligible for a natural gas incentive through PG&E). All four sites selected had a hybrid DDC/pneumatic controls system in which the central plant is controlled digitally and the zones are controlled pneumatically. However WPTs can also be applied to all-pneumatic systems using the central WPT hub controller. kW Engineering was not directly involved in the installation at any site. The installations were handled through either site staff or a controls contractor. The table below lists some key parameters for the pilot sites studied. 11
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