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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

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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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