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a) The mass flow rate of the refrigerant through the upper cycle. 5) The rate of heat extraction from the cooling area. =) The Coefficient of Performance (COP) of this refrigeration system

a) The mass flow rate of the refrigerant through the upper cycle. 5) The rate of heat extraction from the cooling area. =) The Coefficient of Performance (COP) of this refrigeration system

Refrigeration and Air Conditioning Technology (MindTap Course List)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter22: Condensers
Section: Chapter Questions
Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...
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Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.4 MPa and 280 kPa using refrigerant-134a as the working fluid. The heat rejection from the lower cycle to the upper cycle occurs in an adiabatic counterflow heat exchanger where the pressures in the upper and lower cycles are 0.5 MPa and 600 kPa, respectively. In both cycles, the refrigerant exits the condenser as a saturated liquid and enters the compressor as a saturated vapor. The isentropic efficiency of the compressors is 85 percent. Given the mass flow rate of the refrigerant through the lower cycle is 0.18 kg/s, calculate: (a) The mass flow rate of the refrigerant through the upper cycle. (b) The rate of heat extraction from the cooling area. (c) The Coefficient of Performance (COP) of this refrigeration system.
Transcribed Image Text:Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.4 MPa and 280 kPa using refrigerant-134a as the working fluid. The heat rejection from the lower cycle to the upper cycle occurs in an adiabatic counterflow heat exchanger where the pressures in the upper and lower cycles are 0.5 MPa and 600 kPa, respectively. In both cycles, the refrigerant exits the condenser as a saturated liquid and enters the compressor as a saturated vapor. The isentropic efficiency of the compressors is 85 percent. Given the mass flow rate of the refrigerant through the lower cycle is 0.18 kg/s, calculate: (a) The mass flow rate of the refrigerant through the upper cycle. (b) The rate of heat extraction from the cooling area. (c) The Coefficient of Performance (COP) of this refrigeration system.
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