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Applying the Entropy Balance: Closed SystemsOne kg of air
Chapter 6, Problem 47P(choose chapter or problem)
Refrigerant 134a contained in a piston–cylinder assembly rapidly expands from an initial state where \(T_{1}=140^{\circ} \mathrm{F}, \ p_{1}=200 \mathrm{\ lbf} / \mathrm{in} .^{2}\) to a final state where \(p_{2}=5 \mathrm{\ lbf} / \mathrm{in} .^{2}\) and the quality, \(x_{2}\), is (a) 99%, (b) 95%. In each case, determine if the process can occur adiabatically. If yes, determine the work, in Btu/lb, for an adiabatic expansion between these states. If no, determine the direction of the heat transfer.
Questions & Answers
QUESTION:
Refrigerant 134a contained in a piston–cylinder assembly rapidly expands from an initial state where \(T_{1}=140^{\circ} \mathrm{F}, \ p_{1}=200 \mathrm{\ lbf} / \mathrm{in} .^{2}\) to a final state where \(p_{2}=5 \mathrm{\ lbf} / \mathrm{in} .^{2}\) and the quality, \(x_{2}\), is (a) 99%, (b) 95%. In each case, determine if the process can occur adiabatically. If yes, determine the work, in Btu/lb, for an adiabatic expansion between these states. If no, determine the direction of the heat transfer.
ANSWER:Step 1 of 2
We have to find the direction of heat transfer.