A piston/cylinder shown in Fig. P3.169 contains 0.5 m 3 of R-410a at 2 MPa, 150C. The

Question:

A piston/cylinder shown in Fig. P3.169 contains 0.5 m³ of R-410a at 2 MPa, 150◦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◦C. Find the heat transfer and show the P–v diagram for the process when T₂ =−20◦C.A