A two stage compression refrigeration system uses R-134a as the working fluid. T

Question

A two stage compression refrigeration system uses R-134a as the working fluid. The System operates

between pressures of 0.14 MPa and 0.8 MPa. The flash chamber operates at 0.32 MPa. The refrigerant

enters the first compressor as a saturated vapor, and exits the condenser as a saturated liquid. After

exiting the flash chamber the two streams are saturated liquids and saturated vapors.

Find

a) the fraction of the refrigerant that exits the flash chamber as a vapor

b) The amount of heat removed from the refrigerated space (kj/kg)

c) The work required for the compressors (kj/kg)

d) The COP

Explanation / Answer

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