A piston-cylinder device contains 0.8 m3 of Refrigerant-134a at 320 kPa and 100oC. The R-134a is now cooled at constant pressure until the temperature drops to 10oC. Determine the heat transfer. Sketch the process on a Tv diagram showing the saturation lines.
(Answer: -750.33 kJ)
An insulated, rigid tank contains 0.5 kg of water in a liquid-vapor mixture at 95oC with a specific volume of 1.1988 m3/kg. An electric heater inside the tank does work on the water, raising its pressure to 200 kPa. What is the final temperature of the water ? How much electrical work was done on the water ? Sketch the process on a Pv diagram.
(Answers: 250oC, - 531 kJ)