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 oC Enthalpy, kJ/kg Entropy, kJ/kgK Specific Heat, 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 - -
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