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A refrigerating system operating on reversed Brayton refrigeration cycle is used...

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A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

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Correct Answer: Option B
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be 50 kJ/kg
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Nebish Adhikari
Nebish Adhikari 7 years ago
Here ambient air will be at 350K.

Air after cooling effect = 300K (air temp inc as it act as refrigerant).

Air before cooling effect = 250K.

Cooling effect = (300-250) = 50 KJ/KG.

Total heat rejected to atm= (350-250) = 100KJ/KG.

Hence work done by compressor= thr - ce = 100-50= 50KJ/KG.
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