Answer: Refrigerant 134a enters the compressor of a
Chapter 10, Problem 41P(choose chapter or problem)
Refrigerant 134a enters the compressor of a vapor compression heat pump at \(15 \mathrm{\ lbf} / \mathrm{in} .^{2}, \ 0^{\circ} \mathrm{F}\) and is compressed adiabatically to \(160 \mathrm{\ lbf} / \mathrm{in.}^{2}, \ 160^{\circ} \mathrm{F}\). Liquid enters the expansion valve at \(160 \mathrm{\ lbf} / \mathrm{in} .^{2}, \ 95^{\circ} \mathrm{F}\). At the valve exit, the pressure is \(15 \text { lbf/in. }{ }^{2}\)
(a) Determine the isentropic compressor efficiency.
(b) Determine the coefficient of performance.
(c) Perform a full exergy accounting of the compressor power input, in Btu per lb of refrigerant flowing. Discuss.
Let \(T_{0}=480^{\circ} \mathrm{R}\).
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