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

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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Question

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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