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مکانیک::
راندمان آیزنتروپی (آنتالپی ثابت)، راندمان آیزنتروپی (هم آنتالپی)
The pump has an isentropic efficiency of 70%.
Figure 2.6 demonstrates that the energy effi- ciency and the isentropic efficiency of the pump do not change with ambient temperature, while the exergy efficiency decreases with increasing ambient tem- perature.
It can be seen that, while energy efficiency and isentropic efficiency of the pump do not change, exergy efficiency increases as the pump inlet temperature with increases.
Compression isentropic efficiency (ηs) considers only what occurs within the compression volume and is a measure of the deviation of actual compression from isentropic compression.
Figure 2.10 demonstrates that the energy and isentropic efficiencies of the compressor do not vary with changing ambient temperature but that the exergy efficiency increases as ambi- ent temperature rises.،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
For ex- ample, we know that the costs of purchasing the gas turbine and the air compressor increase with increasing pressure ratio and increasing values of the respective isentropic efficiencies; moreover, the costs of purchasing the gas turbine and the combustion chamber increase ex- ponentially with increasing temperature
According to assumption 4 of the cost model, the capital investment costs of the gas turbine depend on temperature pressure ratio and isentropic efficiency To reduce the high Z value associated with the gas turbine, we should consider a reduction in the value of at least one of these variables.
This may be achieved by reducing the pressure ratio and/or the isentropic efficiency
Decrease the pressure ratio (and thus and the isentropic efficiencies and as suggested by the evaluation of the air com- pressor and gas turbine.
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