Question

A "R-12" refrigerating machine works on standard vapor-
compression cycle. The temperature of refrigerant in evaporator
is -20°. The vapor is dry saturated when it enters the
compresor. The condenser temp is 30°C assuming specific heat
at constant pressure for R-12 in the superheated condition as
1.884kJ/kg k, determine;
a) condition of vapor at the entrance to the evaporator
b) C.O.P of the machine
Temp. Enthalpy, kJ/kg
Liquid Vapor
Entropy, kJ/kg K
Liquid
Vapor
-20
17.82
178.73
0.0731
0.7087
30
64.59
199.62
0.2400
0.6843​

Answer 1

Answer:

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