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SRI/USEPA-GHG-VR-27 September 2003 Annual NOX and CO2 emissions reductions for the CHP system at the test site are estimated by comparing measured lb/kWh emission rates with corresponding emission rates for the baseline power and heat- production systems (i.e., systems that would be used if the CHP system were not present). The baseline systems at this site include electricity supplied from the local utility grid and heat from the facility's natural gas-fired burners. Baseline emissions for the electrical power were determined following Ozone Transport Commission (OTC) guidelines. Baseline emissions from heat production are based on EPA emission factors for commercial-scale gas-fired burners. Electrical power quality parameters, including electrical frequency and voltage output, were also measured during the 14-day extended test. Current and voltage total harmonic distortions (THD) and power factors were also monitored to characterize the quality of electricity supplied to the end user. The guidelines listed in “The Institute of Electrical and Electronics Engineers’ (IEEE) Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems” were used to perform power quality testing. Quality Assurance (QA) oversight of the verification testing was provided following specifications in the ETV Quality Management Plan (QMP). EPA personnel conducted an on-site technical systems audit during the testing program. The GHG Center staff conducted two performance evaluation audits and an audit of data quality on at least 10 percent of the data generated during this verification. The GHG Center field team leader and project manager have reviewed the data from the verification testing and have concluded that the data have attained the data quality objectives that are specified in the Test and Quality Assurance Plan. VERIFICATION OF PERFORMANCE Heat and Power Production Performance • 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. • Considering parasitic loads from the gas compressor and glycol circulation pump, the net power delivered at full load averaged 54.9 kW. Net electrical efficiency during the controlled test periods ranged from 26.2 percent at full load to 13.1 percent at the lowest load tested (25 percent of capacity). Electrical efficiency was not impacted by changes in operation of the heat recovery system. HEAT AND POWER PRODUCTION Electrical Power Generation 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 Full load, heat recovery maximized 59.6 28.4 54.9 26.2 373.0 System Efficiency (%) 52.2 78.4 S-4PDF Image | Environmental Technology Verification Report
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