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In a 15 TR ammonia refrigeration plant for cooling a large warehouse, the

condensing temperature is 25oC and evaporating temperature -10oC. The refrigerant

ammonia is sub-cooled by 5oC before passing through the throttle valve. The vapour

leaving the evaporator is 0.97 dry. Find:

1. Coefficient of performance

2. Power required

Saturation

Temperature Enthalpy Entropy Specific Heat,

oC kJ/kg kJ/kgK kJ/kgK

Liquid Vapour Liquid Vapour Liquid Vapour

25 298.9 1465.84 1.1242 5.0391 4.6 2.8

-10 135.37 1433.05 0.5443 5.4770 - -