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Efficiency = 3,413 btu/kw.hr 10,000 btu/kw.hr 400,000,000 btu/hr Heat Rate = = 10,000 btu/kw.hr The efficiency of this same package at these operating conditions can be found by use of the conversion factor 1 kW = 3,413 btu/hr, for example: 40,000 kW = 34.1 % In the above general example, we have actually left out two (2) very important factors which must always be included when discussing heat rate, efficiency and fuel consumption: a) was the power output expressed on net or gross basis? b) was the fuel consumption expressed in lower heating value (LHV) terms or in higher heating value (HHV) terms? If we assume that the above GTG package had a Gross Power output of 40 MW and an Auxiliary Loss of 250 kW, the net power output would be: Net Power Output = Gross Power Output - Auxiliary Losses = 40,000 - 250 kW = 39,750 kW. Similarly, if the previously stated 400 x 106 btu/hr fuel input was the LHV fuel consumption, the corresponding fuel input in HHV terms (assuming natural gas) would be: HHV Fuel Consumption = 400 x 106 btu/hrLHV x 1.11 = 444 x 106 btu/hrHHV The corresponding gross and net power outputs, heat rates and efficiencies for this GTG package, at this operating condition, expressed in both LHV and HHV terms, is summarized as follows: Gross Power Output = Net Power Output = LHV Fuel Consumption = HHV Fuel Consumption = Gross Heat Rate - HHV = Gross Heat Rate - LHV = Net Heat Rate - HHV = Net Heat Rate - LHV = 40,000 39,750 400 x 106 444 x 106 11,100 10,000 11,170 10,063 kW kW btu/hrLHV btu/hrHHV (natural gas) btu/kw.hrHHV btu/kw.hrLHV btu/kw.hrHHV btu/kw.hrLHV UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 11PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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