Answer to Question #110700 in Thermal Power Engineering for Mohd Amir Hussain

Question #110700
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

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 - -
Expert's answer
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