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Q1. In a vapor compression refrigeration cycle Ammonia is compressed between saturation temperatures of -12ºC and +22ºC. The refrigerant is dry saturated at entry to the compressor and leaves the condenser with 4 degrees of under-cooling. The cooling load is 1.5 MW and the isentropic efficiency of the compressor is 82%.

(a) Sketch the cycle on P-h and T-s diagrams.

(b) Determine EACH of the following:

(i) The co-efficient of performance;

(ii) The compressor power in kW;

(iii) The Carnot co-efficient of performance between the same pressure limits.