28 tonnes of ice from and at 0C is produced per day in an ammonia refrigerator....

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28 tonnes of ice from and at 0°C is produced per day in an ammonia refrigerator. The temperature range in the compressor is from 25°C to - 15°C. The vapour is dry and saturated at the end of compression and an expansion valve is used. Assuming a co-efficient of performance of 62% of the theoretical, calculate the power required to drive the compressor. Enthalpy (kJ/kg) Temp. °C 25 - 15 Liquid 100.04 - 54.56 Vapour 1319.22 1304.99 Entropy of liquid (kJ/kg K) 0.3473 -2.1338 Entropy of vapour kJ/kg K 4.4852 5.0585 28 tonnes of ice from and at 0°C is produced per day in an ammonia refrigerator. The temperature range in the compressor is from 25°C to - 15°C. The vapour is dry and saturated at the end of compression and an expansion valve is used. Assuming a co-efficient of performance of 62% of the theoretical, calculate the power required to drive the compressor. Enthalpy (kJ/kg) Temp. °C 25 - 15 Liquid 100.04 - 54.56 Vapour 1319.22 1304.99 Entropy of liquid (kJ/kg K) 0.3473 -2.1338 Entropy of vapour kJ/kg K 4.4852 5.0585

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