An inflatable bag, initially flat and empty, is connected to a supply line of saturated vapor R-22 at ambient temperature of 10C. The valve is opened, and the bag slowly inflates at constant temperature to a final diameter of 2 m. The bag is inflated at constant pressure, Po 100 kPa, until it becomes spherical at Do = 1 m. After this the pressure and diameter are related according to A maximum pressure of 500 kPa is recorded for the whole process. Find the heat transfer to the bag during the inflation process.