Posted: March 1st, 2017

. Determine (1) the final pressure (b) the change in the volume of the cylinder and (c) the change in the enthalpy of the refrigerant.

A piston –cylinder device contains 0.85 kg of refrigerant 134a at -10 oC. The piston that is free to move has a mass of 12 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, the heat is transferred to the refrigerant until the temperature is 15 oC. Determine (1) the final pressure (b) the change in the volume of the cylinder and (c) the change in the enthalpy of the refrigerant.