As shown in the Figure, in a vapor compression refrigeration cycle using R134a with 175 kW cooling capacity, the output of the evaporator is saturated vapor. The main compressor is isentropic and compresses the R134a vapor up to a 1.2 MPa pressure. Some of the saturated vapor is taken at the exit of the condenser (State 3) and is expanded to an intermediate pressure (State 6) by a throttling valve. Thus, a subcooling is provided. The compressor that provides compression from intermediate pressure to condensing pressure is also isentropic.

a) Draw the T-s diagram of the cycle.

b) Draw the lnP-h diagram of the cycle.

c) Calculate the coefficient of performance (COP)?

 

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Here are the stepbystep workings a Ts diagram State 1 Saturated vapor at evaporator exit T1 ... View the full answer