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HEAT AND POWER PRODUCTION Electrical Power Generation SRI/USEPA-GHG-VR-27 September 2003 Heat Recovery Total Performance CHP Gross Power Output (kWe) Gross Efficiency (%) Net Power Delivered (kWe) Net Efficiency (%) Heat Recovery (103Btu/hr) Thermal Efficiency (%) Test Condition 75-percent load, heat recovery maximized 50-percent load, heat recovery maximized 25-percent load, heat recovery maximized Full load, normal operation 50-percent load, normal operation 44.5 27.0 29.5 23.8 14.4 19.3 59.6 28.4 29.5 23.7 39.9 24.2 24.8 20.0 9.8 13.1 54.9 26.2 24.9 20.0 317.0 239.6 148.5 51.4 68.6 System Efficiency (%) 56.4 80.7 56.7 76.7 58.0 71.1 7.2 33.3 16.2 36.2 • Total CHP efficiency during the controlled test periods with operation configured to maximize heat recovery ranged from 71.1 percent at 25-percent load to 80.7 percent at 75-percent load. CHP efficiency was 33.3 percent at full load during normal heat recovery controlled tests because of low space heating and dehumidification demand during testing. • Electrical, thermal, and CHP efficiencies during the 14-day extended monitoring period averaged 25.7, 8.0, and 33.7 percent, respectively. Low space heating and dehumidification demand was evident throughout the period. Emissions Performance • NOX emissions at full load were 0.00015 lb/kWh and increased as power output decreased. Changes in operation of the heat exchanger did not produce a significant impact on NOX emissions. • Emissions of CO, THC, and CH4 were also lower at full load and increased slightly as power output was reduced. Changes in operation of the heat exchanger did not produce a significant impact on emissions of these pollutants. • NOX emissions per unit electrical power output at full load were 0.00015 lb/kWh, well below the average levels reported for the regional grid (0.0024 lb/kWh). The average CO2 emissions for the regional grid are estimated at 1.53 lb/kWh which is nearly identical to the emission rate for the Capstone 60 (which had 1.54 lb/kWhe). These values, along with emission reductions attributed to the CHP system heat recovery performance, yield an average annual emission reduction of 1,064 lbs (17 percent) for NOX and 328,478 lbs (8 percent) for CO2. S-5PDF Image | Environmental Technology Verification Report
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