Q3. Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and -5 C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 70 C. The refrigerant is cooled in the condenser to 44 C and 1.15 MPa, and it is throttled to 0.21 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor, and (c) the COP of the refrigerator. Solve this question using both tables and P-h chart.

Q3. Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and -5 C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 70 C. The refrigerant is cooled in the condenser to 44 C and 1.15 MPa, and it is throttled to 0.21 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor, and (c) the COP of the refrigerator. Solve this question using both tables and P-h chart.

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

Q3. Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa
and -5 C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 70 C. The refrigerant is cooled in the
condenser to 44 C and 1.15 MPa, and it is throttled to 0.21 MPa. Disregarding any heat transfer
and pressure drops in the connecting lines between the components, show the cycle on a T-s
diagram with respect to saturation lines, and determine (a) the rate of heat removal from the
refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the
compressor, and (c) the COP of the refrigerator. Solve this question using both tables and P-h chart.

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