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Determine: i) Actual COP, ii) Actual power input to the compressor.

A refrigeration machine using R-12 as refrigerant operates between the pressures 2.5 bar and 9 bar. The vapor entering the compressor is dry saturated and there is no sub-cooling in the condenser. If the capacity of the plant is 20 TR and the relative COP is 6.5%. Determine: i) Actual COP, ii) Actual power input to the compressor.

Properties of the refrigerant are given below:

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Take sp. Heat of refrigerant vapour as 0.67 kJ/kg-K

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