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A vertical piston-cylinder contains 1.5 lbm of air. The piston has a mass of 6 Ibm and a face area of 10 in2. The air initially occupies a volume of 30.6 in3 and has a specific internal energy of 225 BTU/lbm. The atmosphere exerts a pressure of 1 atm on the top of the piston. Heat transfer occurs slowly during the process between the air in the piston and the surroundings, and the volume of the air decreases to 15.0 in3. Friction between the piston and the cylinder wall can be neglected. Assume the atmospheric pressure remains constant. The local acceleration of gravity is 32.2 ft/s2. For the air in the cylinder determine (a) the pressure of the air in the cylinder in psi, and (b) the heat transfer, Q, during the process in BTU, if the final specific internal energy is 125 BTU/lb . (c) Based upon your result in part (b), in which direction does the heat transfer occur? Le. does it occur from the air in the cylinder to the surroundings or from the surroundings to the inside of the cylinder?

engineering   Mechanical-Engineering   
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