Refrigerant 22 undergoes a constant-pressure process within a piston-cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 30°C. Kinetic and potential energy effects are negligible. Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.

Calculate the energy requirement to raise the temperature of 1 kg of water from 60 ° C of water to 100 ° C using the following approach; a. Use of mean specific heat = .... kJ. b. Enthalpy change in water - vapor saturation table  = .... kJ.

-Gas supply line- Gas A 1.5 m3 tank initially contains a gas at 140 kPa, 340 K. The tank is connected a line carrying same gas at 1400 kPa and 340 K. What should be heat transfer during this process, in kJ, so that the final pressure and temperature are 1400 kPa and 340 K, respectively. (cp=0.72 kJ/kg.K, cv=0.48 kJ/kg.K).