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Academics – Applied Heat : 2012/MAR/06
Question

Q14. A vapour compression refrigeration cycle uses ammonia (R717) and operates between pressures of 2.680 bar and 14.70 bar. The refrigerant enters the compressor at a temperature of -8°C and is compressed with an isentropic efficiency of 85%. The refrigerant leaves the condenser as saturated liquid.

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

(b) Determine EACH of the following:

(i) The temperature leaving the compressor

(ii) The coefficient of performance of the cycle.

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