A piston cylinder device contains 0.5 kg of water at 2 MPa and 450°C. The steam loses heat to the surroundings causing the piston to make contact with some stops, at this point, we have 0.2 kg of steam. The Cooling continues until the substance is at 150°C. Determine the total heat transfer. Answer: -1225.64 kJ -

A piston-cylinder device contains 9.4 kg of refrigerant R-134a at 100 kPa and has a volume of 1.8 m3. The refrigerant is now heated at constant pressure until the temperature becomes 60 oC. Determine: (a) The initial temperature of the refrigerant (oC), (b) The final volume of the refrigerant ( in m3), (c) The amount of work done during the process (in kJ), (d) The change in the internal energy of the refrigerant (in kJ). Submit your solution by multiplying (a)*(b)*(c)*(d)/100000 = Format answer : -87.8 Submit

A piston-cylinder device contains 1.5 kg of steam at 300°C and 0.4 MPa. Steam is cooled at constant pressure until one-half of the mass condenses. 1) Draw a diagram of the piston-cylinder device. 2) Show the process on a T-v diagram.