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CHAPTER 7 Capstone PERFORMANCE Example Calculations Table 7-5 provides an example calculation for a C200 low pressure natural gas microturbine operating at 30 C (86 F), 1,500 ft elevation, 2 inches WC inlet pressure loss, and 3 inches WC exhaust back pressure. Table 7-5. Example Calculation for Nominal Power, Efficiency, and Exhaust Characteristics Steps Rule Example 1. Define output power, efficiency, and exhaust characteristics at ambient temperature and sea level Use Table 7-2 For 86 F (30 C) Ambient: Output = 186 kW electric Efficiency = 31.7% Exhaust Temp = 570 F Exhaust Flow = 2.87 lbm/s 2. Estimate electric output at the given elevation 5. Calculate Nominal Net Power Output 6. Calculate Nominal Net Efficiency 7. Calculate Fuel Input 8. Consider Parasitic Loads Use Figure 7-2 kW (net) = kW (step 2) X Inlet CF X Exhaust CF Efficiency (net) = Efficiency (step 1) X Inlet CF X Exhaust CF Fuel [kW] = kW(net)/ Efficiency (net) Subtract parasitic loads, if any for 1,500ft Elevation: Output = 176 kW electric For Example Above: kWnet = 172 kW For Example Above: Efficiency (net) = 31.3% For Example Above: Fuel [kW] = 550 kW (or 1,880,000 BTU/hr) For Low Pressure NG: Parasitic = 10 kW Useable Power = 162 kW 3. Estimate Power and Efficiency Correction Factors for Inlet Pressure Loss Use Table 7-3 for 2 inch WC: Power CF = .987 Efficiency CF = .995 4. Estimate Power and Efficiency Correction Factors for Exhaust Back Pressure Use Table 7-4 for 3 inch WC: Power CF = .988 Efficiency CF = .993 9. Estimate Exhaust Characteristics Temp = Temp from step 1 Flow = Flow from step 1 times kWnet/kW step 2 less .5% per 1,000 ft Elevation Exhaust Temp = 570 F Exhaust Flow = 2.7 lbm/s 410066 Rev C (June 2009) 7-13 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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