Applying the Energy Balance As shown in Fig. P3.60, a rigid, closed tank having a...

Applying the Energy Balance

As shown in Fig. P3.60, a rigid, closed tank having a volume of 20 ft³ and filled with 75 lb of Refrigerant 134a is exposed to the sun. At 9:00 a.m., the refrigerant is at a pressure of 100 lbf/in.² By 3:00 p.m., owing to solar radiation, the refrigerant is a saturated vapor at a pressure greater than 100 lbf/in.² For the refrigerant, determine (a) the initial temperature, in °F, (b) the final pressure, in lbf/in.², and (c) the heat transfer, in Btu.