A vapour compression refrigeration system with ammonia as the working fluid is to operate between 2 6 6 K and 3 0 0 K Determine the following ( i ) COP , given that the enthalpy of saturated vapour at 2 6 6 K 6 5 6 k J k g and enthalpy of superheated vapour leaving the compressor 7 2 4 k J k g , enthalpy of saturated liquid at 3 0 0 K 1 4 4 k J k g ( ii ) COP, if a temperature approach of 5 K is necessary in the evaporator and condenser and the efficiency of the compressor is 7 5 Enthalpy of saturated vapour at 2 6 1 K 6 5 2 k J k g and the enthalpy of superheated vapour entering the condenser 7 5 8 k J k g , enthalpy of saturated liquid at 3 0 5 K 1 5 9 k J k g

Question

A vapour compression refrigeration system with ammonia as the working fluid is to operate between 2 6 6 K and 3 0 0 K   Determine the following  ( i ) COP , given that the enthalpy of saturated vapour at 2 6 6 K   6 5 6 k J k g and enthalpy of superheated vapour leaving the compressor   7 2 4 k J k g , enthalpy of saturated liquid at 3 0 0 K   1 4 4 k J k g   ( ii ) COP, if a temperature approach of 5 K is necessary in the evaporator and condenser and the efficiency of the compressor is 7 5     Enthalpy of saturated vapour at 2 6 1 K   6 5 2 k J k g and the enthalpy of superheated vapour entering the condenser   7 5 8 k J k g , enthalpy of saturated liquid at 3 0 5 K   1 5 9 k J k g

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Question: A vapour compression refrigeration system with ammonia as the working fluid is to operate between 2 6 6 K and 3 0 0 K .

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