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SRI/USEPA-GHG-VR-27 September 2003 2.1.2. Electrical and Thermal Energy Production and Efficiencies Over the Extended Test Figure 2-3 presents a time series plot of power production and heat recovery during the 14-day extended verification period. The system was operating 24 hours per day and was producing as much electrical power as possible depending on ambient conditions. Heat recovery rates were dictated by store demand. The warm temperatures caused generally low heat demand for the unit during the period. A total of 18,447 kWhe electricity and 5,730 kWhth of thermal energy were generated over an operating period of 336 hours. All of the electricity and heat generated were used by the facility. Electrical, thermal, and total system efficiencies during the extended period averaged 25.7, 8.0, and 33.7 percent, respectively, and were consistent with the efficiencies measured during the controlled test period. The average power generated over the extended period was 55.1 kWe and the average heat recovery rate was 17.1 kWth (58.2 103Btu/hr). The power output trace shows several depressions where output dropped below 54 kW to as low as 50 kW. Review of the data indicate that each of these decreases occurred during afternoon hours when ambient temperatures were above 70 oF. The effect of ambient temperature on power output is further illustrated in Figure 2-4. The figure clearly shows that power output decreases as the ambient temperature (intake air) rises above 60 oF. This trend is consistent with industry knowledge of turbine performance (i.e., electrical power output generally decreases with increasing temperatures). 60 58 56 54 52 50 48 46 44 42 250 200 150 100 50 Power Output (kW) Heat Recovery Rate (103Btu/hr) 40 0 Extended Monitoring Period (14 days) Figure 2-3. Heat and Power Production During the Extended Monitoring Period (1-hour averages) 2-7 1 684 1367 2050 2733 3416 4099 4782 5465 6148 6831 7514 8197 8880 9563 10246 10929 11612 12295 12978 13661 14344 15027 15710 16393 17076 17759 18442 19125 19808 Power Output (kW) Heat Recovery Rate (10 3Btu/hr)PDF Image | Environmental Technology Verification Report
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