(A)
Interpretation:
The maximum attainable coefficient of performance for Freon.
Concept Introduction:
The energy balance equation of the reversible compressor is,
Here, total mass is
The expression to obtain the actual shaft work
Here, rate of reversible shaft work is
The expression to obtain the coefficient of performance for Freon 22
Here, rate of heat exchange with low temperature reservoir is
(B)
Interpretation:
The maximum attainable coefficient of performance for refrigerant HFC-134a.
Concept Introduction:
The generalized entropy balance for the reversible compressor is,
Here, mass of the system is M, specific entropy of the system is
The expression to obtain the actual shaft work
The expression of the coefficient of performance
(C)
Interpretation:
Research Freon 22 and HFC-134a and comment on their suitability as refrigerants.
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Chapter 5 Solutions
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