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1) Consider a two-stage cascade refrigeration system operating on an ideal vapor-compression refrigeration cycle between the pressure limits of 1.2 MPa and 120 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.6 and 0.7 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet. The mass flow rate of the refrigerant through the lower cycle is 0.27 kg/s. Find: a) The mass flow rate of the upper cycle b) The Heat removed from the refrigerated space c) The COPR

1) Consider a two-stage cascade refrigeration system operating on an ideal vapor-compression refrigeration cycle between the pressure limits of 1.2 MPa and 120 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.6 and 0.7 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet. The mass flow rate of the refrigerant through the lower cycle is 0.27 kg/s. Find: a) The mass flow rate of the upper cycle b) The Heat removed from the refrigerated space c) The COPR

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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1) Consider a two-stage cascade refrigeration system operating on an ideal vapor-compression refrigeration cycle between the pressure limits of 1.2 MPa and 120 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.6 and 0.7 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet. The mass flow rate of the refrigerant through the lower cycle is 0.27 kg/s. Find: a) The mass flow rate of the upper cycle b) The Heat removed from the refrigerated space c) The COPR Notes: The pressures of the adiabatic counterflow heat exchanger are different (upper 0.6 MPa and lower 0.7 MPa). Notice that the upper pressure is greater than the lower.
Transcribed Image Text:1) Consider a two-stage cascade refrigeration system operating on an ideal vapor-compression refrigeration cycle between the pressure limits of 1.2 MPa and 120 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.6 and 0.7 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet. The mass flow rate of the refrigerant through the lower cycle is 0.27 kg/s. Find: a) The mass flow rate of the upper cycle b) The Heat removed from the refrigerated space c) The COPR Notes: The pressures of the adiabatic counterflow heat exchanger are different (upper 0.6 MPa and lower 0.7 MPa). Notice that the upper pressure is greater than the lower.
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