A two-stage compression refrigeration system operates between the pressure limits of 1 MPa and 0.12 MPa. The refrigerant, R-134a, leaves the condenser as saturated liquid and is throttled to a flash chamber operating at 0.7 MPa. The refrigerant leaving the low-pressure compressor at 0.7 MPa is also routed to the flash chamber. The vapor 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 vapor and both the compressors are isentropic, determine (a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber, (b) the rate of heat removed from the refrigerated space for a mass flow rate of 1 kg/s through the condenser and (c) the coefficient of performance. (d) What-if Scenario: Do a parametric study of how the COP changes with the flash chamber pressure as it increases from 0.5 MPa to 0.9 MPa.