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CHAPTER 7 Capstone PERFORMANCE Calculate Nominal Net Power and Fuel Input The net power output can be estimated from previous steps by multiplying the inlet and exhaust back pressure correction factors times the estimated power output from Figure 7-2. For example, using Figure 7-2 for 30 C (86 F) temperature and 1,500 ft elevation, the estimated nominal power output is 176 kW. If the inlet pressure loss is 2 inches of water column, then the power correction factor from Table 7-4 is .987. For a 3 inch water column back pressure drop, the correction factor from Table 7-4 is .988. Use the following equation to estimate the net power: kW (net) = kW (elevation & temp) X Inlet CF X Back Pressure CF Continuing the example, the 176 kW gross power output becomes a net power of 172 kW after multiplying by the inlet and exhaust backpressure correction factors. A similar calculation can be done for efficiency. Referring to Table 7-2 and using the same ambient temperature of 30 C (86 F), the efficiency is tabulated as 31.7%. For an inlet pressure loss of 2 inches of water column, the efficiency correction factor from Table 7-3 is .995. For an exhaust backpressure of 3 inches of water column, the efficiency correction factor from Table 7-4 is .993. Use the following equation to estimate the net efficiency: Efficiency (net) = Efficiency (ambient temp) X Inlet CF X Back Pressure CF Continuing the example, the 31.7% gross efficiency becomes a net efficiency of 31.3% after multiplying by the inlet and exhaust correction factors. The fuel input can now be estimated from the net power and efficiency using the following equation: Net Fuel Input [kW] = Net Power Output [kW] Net Efficiency [%] For the example given above with net output power of 172 kW and net efficiency of 31.3%, the estimated fuel input is 550 kW. To convert this to English units, multiply the kW of fuel times 3,413 BTU per kWh to get 1,880,000 BTU/hr. Parasitic Loads The impact of parasitic loads on useable power output should be considered. For the low pressure natural gas model C200, the internal fuel gas booster requires approximately 10 kW of power under most operating conditions. This is because it is always trying to maintain fuel inlet pressure to the turbine regardless of microturbine output power requirements or inlet fuel pressure. So for any estimated net power output, subtract 10 kW for a low pressure natural gas model C200. Other values may need to be provided if an external gas compressor is used, or other system parasitic loads need to be considered. Using the example above for of 30 C (86 F) ambient, 1,500 ft elevation, and inlet and back pressure correction factors applied, the 172 kW net output becomes a useable power output for customer loads of 162 kW after subtracting 10 kW for a fuel gas booster. 410066 Rev C (June 2009) 7-11 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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