Thermodynamics and Heat Transfer 5. A Carnot heat engine absorbs heat at a rate of 10...

 

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Thermodynamics and Heat Transfer 5. A Carnot heat engine absorbs heat at a rate of 10 kJ/s from a source at 500°C and rejects the waste heat to the environment at 25°C. It is proposed that the heat engine will be used to drive a Carnot refrigerator that removes heat from the cooled space at -10°C and rejects it to the same environment at 25°C. i) Determine the minimum rate of heat removal from the cooled space. ii) What is the minimum rate of heat rejected by the refrigerator if the heat engine now receives heat at a rate of 10 kJ/s from a source maintained at 400°C. (4+4) Thermodynamics and Heat Transfer 5. A Carnot heat engine absorbs heat at a rate of 10 kJ/s from a source at 500°C and rejects the waste heat to the environment at 25°C. It is proposed that the heat engine will be used to drive a Carnot refrigerator that removes heat from the cooled space at -10°C and rejects it to the same environment at 25°C. i) Determine the minimum rate of heat removal from the cooled space. ii) What is the minimum rate of heat rejected by the refrigerator if the heat engine now receives heat at a rate of 10 kJ/s from a source maintained at 400°C. (4+4)

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i The minimum rate of heat removal from the cooled space can be calculated using the Carn ot efficiency equation 1 T 2 T 1 Where T 1 is the temperatur... View the full answer