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. draw the PH and TS diagram _____________ 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 70 kW, determine the volume flow rate for both cycles.
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. draw the PH and TS diagram _____________ 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 70 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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Question
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.
draw the PH and TS diagram
_____________ 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 70 kW, determine the volume flow rate for both cycles.
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