is used to superheat the vapor entering the compressor while subcooling the liquid leaving the condenser. The system uses R-134a. The evaporator operates at 15oF and the condenser operates at 100 psia. The heat exchanger provides 40oF of subcooling at the throttle valve entrance. a) Calculate the entropy generation at the throttle for the simple refrigeration cycle. Calculate also the entropy generation of the universe (throttle + surroundings) due to this operation. b) Calculate the process efficiency of the heat exchanger for the refrigeration cycle that includes the heat exchanger
is used to superheat the vapor entering the compressor while subcooling the liquid leaving the condenser. The system uses R-134a. The evaporator operates at 15oF and the condenser operates at 100 psia. The heat exchanger provides 40oF of subcooling at the throttle valve entrance. a) Calculate the entropy generation at the throttle for the simple refrigeration cycle. Calculate also the entropy generation of the universe (throttle + surroundings) due to this operation. b) Calculate the process efficiency of the heat exchanger for the refrigeration cycle that includes the heat exchanger
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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An improved refrigeration system with a heat exchanger is shown in the following picture. The heat exchanger is used to superheat the vapor entering the compressor while subcooling the liquid leaving the condenser. The system uses R-134a. The evaporator operates at 15oF and the condenser operates at 100 psia. The heat exchanger provides 40oF of subcooling at the throttle valve entrance.
a) Calculate the entropy generation at the throttle for the simple refrigeration cycle. Calculate also the entropy generation of the universe (throttle + surroundings) due to this operation.
b) Calculate the process efficiency of the heat exchanger for the refrigeration cycle that includes the heat exchanger
Transcribed Image Text:2
Compressor
Condenser
Heat exchanger
Evaporator
3
Expansion Valve
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