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Applying the Energy BalanceThree lb of water is contained
Chapter 3, Problem 74P(choose chapter or problem)
Three lb of water is contained in a piston-cylinder assembly, initially occupying a volume \(V_1=30 \mathrm{ft}^3\) at \(T_1=300^{\circ} \mathrm{F}\). The water undergoes two processes in series:
Process 1-2: Constant-temperature compression to \(V_2=11.19 \mathrm{ft}^3\) during which there is an energy transfer by heat from the water of \(1275 \mathrm{Btu}\).
Process 2-3: Constant-volume heating to \(p_3=120 \mathrm{lbf} / \mathrm{in.}^2\)
Sketch the two processes in series on a T–y diagram. Neglecting kinetic and potential energy effects, determine the work in Process 1–2 and the heat transfer in Process 2–3, each in Btu.
Questions & Answers
QUESTION:
Three lb of water is contained in a piston-cylinder assembly, initially occupying a volume \(V_1=30 \mathrm{ft}^3\) at \(T_1=300^{\circ} \mathrm{F}\). The water undergoes two processes in series:
Process 1-2: Constant-temperature compression to \(V_2=11.19 \mathrm{ft}^3\) during which there is an energy transfer by heat from the water of \(1275 \mathrm{Btu}\).
Process 2-3: Constant-volume heating to \(p_3=120 \mathrm{lbf} / \mathrm{in.}^2\)
Sketch the two processes in series on a T–y diagram. Neglecting kinetic and potential energy effects, determine the work in Process 1–2 and the heat transfer in Process 2–3, each in Btu.
ANSWER:Solution
Step 1 of 4
In this problem, we have to determine the work in Process 1−2 and the heat transfer in Process 2−3, each in Btu and sketch the process in series on T-V diagram and find and
