In A Refrigerator Using R134a Evaporation Takes Place At 0 14 Mpa And The Result

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In a refrigerator using R134a, evaporation takes place at 0.14 MPa, and the resulting vapour enters the compressor at -10. The vapour is then compressed to 1.2MPa, and the temperature of the vapour leaving the compressor is 80.

i. Sketch the two processes on sketches of the T-S and P-h diagrams

ii. What state is the refrigerant when it enters the compressor?

iii. Calculate the isentropic efficiency of the compressor, stating all your assumptions clearly. 

 
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