Required information A piston-cylinder device contains 0.82 kg of refrigerant-134a at -10°C. 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°C. Use data from the tables. R-134a -10°C Determine the change in the enthalpy of the refrigerant-134a. The change in the enthalpy is 21.3 kJ.

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