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SRI/USEPA-GHG-VR-27 September 2003 4.0 TECHNICAL AND PERFORMANCE DATA SUPPLIED BY CDH ENERGY Note: This section provides an opportunity for CDH Energy to provide additional comments concerning the CHP System and its features not addressed elsewhere in the Report. The GHG Center has not independently verified the statement made in this section. This section compares the rated performance data from Capstone to the measured data presented in this report. Capstone provides thermal performance data on page 44 of the Installation and Start-up Manual (Part Number 511519-003). The measured performance data for the microturbine alone are compared to the published data in Figures 4-1 and 4-2 below. The measured efficiency and power data in figures below are slightly different than the values reported in Section 2, which were net values that include the impact of parasitic loads such as the gas compressor and pump. The efficiency data shown in Figure 4-1 are the 1-minute data records for Runs 1 through 6 when the turbine provided the full rated output. The lines represent rated performance. The measured efficiency is based on a measured LHV of 903 Btu/ft3. The rated ISO conditions correspond to 59 °F at sea level (a barometric pressure of 14.7 psia). The measured data were collected when the barometric pressure was 14.52 psia. Therefore, the Capstone-recommended adjustment factor of 1.0% was applied to the rated performance curves1 (shown as dotted lines on the plot). Figure 4-2 compares the measured and rated turbine power output, with and without similar barometric pressure corrections applied. 1 Capstone states that the altitude adjustment for efficiency and power is 3% for each 1000 ft of altitude above sea level, or 5.76% for each 1 psia drop in barometric pressure. Therefore, (14.7 psia – 14.52 psia) x 5.76% is equivalent to a 1.0% decrease in performance. 4-1PDF Image | Environmental Technology Verification Report
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