PROBLEM 2.0: In a conventional refrigeration cycle which uses Freon-12 as the refrigerant, the temperature of the evaporating fluid is -20°C. It leaves the evaporator as saturated vapor at -20°C and enters the compressor. The pressure in the condenser is 1.40 MPa. The liquid leaves the condenser and enters the expansion valve at 40°C. It is proposed to modify this cycle by adding a heat exchanger that would superheat the suction vapor to 25°C. 2.1 Compare the coefficient of performance of these two cycles. 2.2 What is the temperature of the refrigerant entering the expansion valve with the heat exchanger? 2.3 For a load of 50 kW, determine the volume flow rate for both cycles.

PROBLEM 2.0: In a conventional refrigeration cycle which uses Freon-12 as the refrigerant, the temperature of the evaporating fluid is -20°C. It leaves the evaporator as saturated vapor at -20°C and enters the compressor. The pressure in the condenser is 1.40 MPa. The liquid leaves the condenser and enters the expansion valve at 40°C. It is proposed to modify this cycle by adding a heat exchanger that would superheat the suction vapor to 25°C. 2.1 Compare the coefficient of performance of these two cycles. 2.2 What is the temperature of the refrigerant entering the expansion valve with the heat exchanger? 2.3 For a load of 50 kW, determine the volume flow rate for both cycles.

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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PROBLEM 2.0: In a conventional refrigeration cycle which uses Freon-12 as the refrigerant, the temperature
of the evaporating fluid is -20°C. It leaves the evaporator as saturated vapor at -20°C and enters the
compressor. The pressure in the condenser is 1.40 MPa. The liquid leaves the condenser and enters the
expansion valve at 40°C. It is proposed to modify this cycle by adding a heat exchanger that would superheat
the suction vapor to 25°C.
2.1 Compare the coefficient of performance of these two cycles.
2.2 What is the temperature of the refrigerant entering the expansion valve with the heat
exchanger?
2.3 For a load of 50 kW, determine the volume flow rate for both cycles.

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