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SRI/USEPA-GHG-VR-27 September 2003 period. The highest heat recovery rate measured during normal operations during the extended monitoring period was approximately 318,700 Btu/hr under normal site operation (approximately 370,700 Btu/hr was the maximum heat recovery rate measured during the controlled test periods with heat recovery manually maximized). Electrical efficiency averaged 26.2 percent. Thermal efficiency averaged 51.6 percent (7.1 percent under normal heat-recovery operations) at full load with forced heat recovery. Corresponding total CHP system efficiency at full load was 77.8 percent (33.3 percent under normal heat recovery operations). NOX emissions at full load were 4 ppmvd or less (corrected to 15- percent O2). NOX and CO2 emission reductions are estimated to be at least 17 and 8 percent, respectively. In support of this verification, QA staff from EPA-ORD's Technical Services Branch conducted an on-site Technical Systems Audit (TSA) of the GHG Center's testing activities and procedures. Based on the verification approaches and testing procedures specified in the Test Plan, the overall conclusion of the audit was that the GHG Center performed well during this verification. Certain deviations from planned activities and other items of concern were documented in the TSA report, and each is addressed in this report. The primary items noted are listed below along with the location in this report where each item is addressed (in parentheses). • How the "heat exchanger damper full open" test condition was conducted (Section 1.4). • The determination of the parasitic load associated with the glycol pump and its consideration for the overall heat-recovery efficiency of the CHP system (Section 1.4.1). • The actual gas pressure of the fuel gas entering the Capstone 60 (Section 1.4.2). • The absence of a true flow-through calibration of the fuel gas meter system (Section 3.2.2.3). • Calibration of the Vaisala ambient temperature and relative humidity sensor (Section 3.2.2.2). • The circumstances surrounding the expansion of the calibration ranges for the CO and THC analyzers (Section 3.2.5). • Substitution of the faulty Controlotron glycol flow meter with the Onicon turbine meter (Sections 1.4.2 and 3.2.3). • The impact that questionable insulation around the surface-mounted RTDs may have imposed on the glycol delta-temperature readings (Section 3.2.3). • The final condition of the Tedlar bags samples shipped to the analytical laboratory for determination of methane in exhaust gases (Section 3.2.5). In addition to the TSA, the GHG Center conducted two performance evaluation audits (PEAs) and an audit of data quality (ADQ) following procedures specified in the QMP. A full assessment of the quality of data collected throughout the verification period is provided in Section 3.0. The data quality assessment is then used to demonstrate whether the data quality objectives (DQOs) introduced in the Test Plan were met for this verification. 2.1. HEAT AND POWER PRODUCTION PERFORMANCE The heat and power production performance evaluation included electrical power output, heat recovery, and efficiency determination during controlled test periods. The performance evaluation also included determination of total electrical energy generated and used and thermal energy recovered over the extended test period. 2-2PDF Image | Environmental Technology Verification Report
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