Problem 4.084 SI A rigid copper tank, initially containing 1.5m3 of air at 295 K, 4 bar, is connected by a valve to a largesupply line carrying air at 295 K, 15 bar. The valve is opened onlyas long as required to fill the tank with air to a pressure of 15bar. Finally, the air in the tank is at 320 K. The copper tank,which has a mass of 20 kg, is at the same temperature as the air inthe tank, initially and finally. The specific heat of the copper isc = 0.385 kJ/kg · K. Assuming ideal gas behavior for the air,determine: (a) the initial and final mass of air within the tank,each in kg, and (b) the heat transfer to the air and copper tankfrom the surroundings, in kJ, ignoring kinetic and potential energyeffects.
