A vapor compression refrigeration cycle undergoes wet compression and maintains the temperature of the refrigerated space to -25C. The system uses R-12 refrigerant and undergoes isentropic expansion to the inlet of the evaporator. The compressor discharges the refrigerant at saturated vapor state at a condensing pressure of 1367 kPa. Determine: a) Determine the enthalpy of all states b) Determine the quality of refrigerant entering the evaporator c) Determine the quality of refrigerant leaving the evaporator
A vapor compression refrigeration cycle undergoes wet compression and maintains the temperature
of the refrigerated space to -25C. The system uses R-12 refrigerant and undergoes isentropic
expansion to the inlet of the evaporator. The compressor discharges the refrigerant at saturated
vapor state at a condensing pressure of 1367 kPa. Determine:
a) Determine the enthalpy of all states
b) Determine the quality of refrigerant entering the evaporator
c) Determine the quality of refrigerant leaving the evaporator
d) Refrigerant effect
e) Work of compression
f) COP
If a liquid to suction heat exchanger was installed to prevent wet compression such that it allows 6C
sub cooling of refrigerant and superheating to 8C. The expansion of refrigerant is no more
isentropic but isenthalpic. Therefore, determine:
g) Enthalpy at different section of the cycle
h) COP of the system compared to COP of standard vapor compression cycle.
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