An insulated heat exchanger is to be used to heat air for a building with heat from combustion products. The air enters at 10°C and exits at 25°C and has a mass flow rate of 1.5 kg/s. The air enters the heat exchanger at 130 kPa and exits at 120 kPa. The combustion products, which can be modeled as air, enter at 250°C and 105 kPa and exit at 100 kPa. Plot the required mass flow rate of the combustion products and the entropy generation rate for the heat exchanger for combustion product exit temperatures ranging from 240°C to 60°C.
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