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SRI/USEPA-GHG-VR-27 September 2003 2.1.1. Electrical Power Output, Heat Recovery Rate, and Efficiency During Controlled Tests Table 2-1 summarizes the power output, heat recovery rate, and efficiency performance of the CHP system. Ambient temperature ranged from 54 to 71 oF, relative humidity ranged from 62 to 97 percent, and barometric pressure was between 14.47 and 14.74 psia during the controlled testing periods. The conditions encountered during testing were similar to standard conditions defined by the International Standards Organization (59 oF, 60 percent RH, and 14.696 psia). The results shown in Table 2-1 and the discussion that follows are representative of conditions encountered during testing and are not intended to indicate performance at other operating conditions such as cooler temperatures and different elevations. Supporting natural gas fuel input characteristics and heat recovery unit operation data corresponding to the test results are summarized in Table 2-2. The average net electrical power delivered to the supermarket was 54.9 kWe at full load. The average electrical efficiency corresponding to these measurements was 26.2 percent. The average gross power output at full load was 59.6 kW at these test conditions (corresponding gross electrical efficiency was about 28.4 percent). The gross power output would be available to potential users not needing sources of significant parasitic load such as the gas compressor and glycol circulation pump. Electric power generation heat rate, which is an industry-accepted term to characterize the ratio of heat input to electrical power output, averaged 13,025 Btu/kWhe at full power. The average heat-recovery rate at full power with heat demand maximized was 373.0 103Btu/hr, or 109.3 kWth/hr, and thermal efficiency was 52.2 percent. Results of three runs indicated that the total efficiency (electrical and thermal combined) was 78.4 percent at this condition. The net heat rate, which includes energy from heat recovery, was 4,354 Btu/kWhtot. 2-3PDF Image | Environmental Technology Verification Report
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