Q9. Ammonia (R717) is used as the refrigerant in a simple vapour compression cycle to maintain the contents of a container at a temperature of 8°C. The temperature of the surroundings is 34°C. To achieve the required heat transfer, the temperature difference between the cold container and the evaporating refrigerant should be 6 K and the temperature difference between the condensing refrigerant and the surroundings should be 10 K. The refrigerant enters the compressor dry and saturated, and there is no undercooling in the condenser. The isentropic efficiency of the compressor is 0.85.
(a) Sketch the cycle on p-h and T-s diagrams.
(b) Determine EACH of the following:
(i) The evaporating and condensing pressures
(ii) The temperature at compressor outlet
(iii) The coefficient of performance of the cycle.
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