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مکانیک::
پیش گرم کن هوا
For example, the heat-recovery steam generator (HRSG) of the cogeneration sys- tem of Figure 1.7 should not be penalized for stream 7 leaving the overall system, particularly since the exergy of the combustion gases is also used in the gas turbine and the air preheater.
Air Preheater (ph)
Using Equation we obtain the values of 753, 188, 68, 753, 264, and 190 (all in levelized dollars per hour) for the air compressor, air preheater, com- bustion chamber, gas turbine, heat-recovery steam generator, and other plant equipment, respectively.
The following decision variables are used for the cogeneration system: The pressure ratio the isentropic efficiencies of the air compressor and gas turbine the temperature of the preheated air at the outlet of the air preheater, and the combustion gas temperature at the
The temperature is a key design variable for it affects both the performance of the entire system (exergy destruction in the combustion chamber, gas turbine, air preheater, and HRSG, and exergy loss associated with stream 7) and the investment costs of the components.
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