Posted: March 1st, 2017

Determine (a) the final pressure (b) the change in the volume of the cylinder and (c) the change in the enthalpy of the refrigerant-134a.

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, heat is transferred to refrigerant-134a until the temperature is 15 oC. Determine (a) the final pressure (b) the change in the volume of the cylinder and (c) the change in the enthalpy of the refrigerant-134a.

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