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A piston/cylinder shown in Fig. P3.169. contains 0.5 m3 of
Chapter 3, Problem 169HP(choose chapter or problem)
A piston/cylinder shown in Fig. P3.169. contains \(0.5\mathrm{\ m}^3\) of R-410a at 2 MPa, \(150^{\circ} \mathrm{C}\). The piston mass and atmosphere give a pressure of 450 kPa that will float the piston. The whole setup cools in a freezer maintained at \(-20^{\circ} \mathrm{C}\). Find the heat transfer and show the P–v diagram for the process when \(T_{2}=-20^{\circ} \mathrm{C}\).
FIGURE P3.169
Questions & Answers
QUESTION:
A piston/cylinder shown in Fig. P3.169. contains \(0.5\mathrm{\ m}^3\) of R-410a at 2 MPa, \(150^{\circ} \mathrm{C}\). The piston mass and atmosphere give a pressure of 450 kPa that will float the piston. The whole setup cools in a freezer maintained at \(-20^{\circ} \mathrm{C}\). Find the heat transfer and show the P–v diagram for the process when \(T_{2}=-20^{\circ} \mathrm{C}\).
FIGURE P3.169
Step 1 of 8
We are given the following data for R-410:
\(\begin{array}{l}T_1=150^{\circ}\mathrm{C}\\ T_2=-20^{\circ}\mathrm{C}\\ P_1=2\mathrm{MPa}\\ P_a=450\mathrm{kPa}\\ n=1.5\\ V_1=0.5\mathrm{\ m}^3\end{array}\)