A two-stage compression refrigeration system operates with refrigerant-134a between the pressure limits of 1.4 and 0.10 MPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.6 MPa. The refrigerant leaving the low-pressure compressor at 0.4 MPa is also routed to the flash
A two-stage compression refrigeration system operates with refrigerant-134a between
the pressure limits of 1.4 and 0.10 MPa. The refrigerant leaves the condenser as a
saturated liquid and is throttled to a flash chamber operating at 0.6 MPa. The
refrigerant leaving the low-pressure compressor at 0.4 MPa is also routed to the flash
chamber. The vapour in the flash chamber is then compressed to the condenser
pressure by the high-pressure compressor, and the liquid is throttled to the evaporator
pressure. Assuming the refrigerant leaves the evaporator as saturated vapour and
both compressors are isentropic,
Determine:
4.1 The fraction of the refrigerant that evaporates as it is throttled to the flash
chamber
4.2 The rate of heat removed from the refrigerated space for a mass flow rate of
0.25 kg/s through the condenser, and
4.3 The coefficient of performance.
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