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Q13. In a vapour compression refrigeration cycle the evaporating temperature is -10°C and the condensing temperature is 40°C. The refrigerant enters the compressor as dry saturated vapour, and leaves the condenser as saturated liquid. Compression is isentropic.

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

(b) Given that the refrigerant is Tetrafluoroethane (R 134a), determine EACH of the following:

(i) The maximum cycle pressure

(ii) The maximum cycle temperature

(iii) The coefficient of performance of the cycle.

(c) The refrigerant is replaced with Ammonia (R 717). Determine EACH of the following:

(i) The maximum cycle pressure

(ii) The maximum cycle temperature.