System boundary Evacuated space Partition H20 m = 5 kg P = 200 kPa Qin T = 25°C Р, КРа 200 3.17E 2

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 0.08-m rigid tank initially contains saturated water vapor at 180 °C. The tank is connected by a valve to a supply line that carries steam at 1400 kPa and 400 °C. Now the valve is opened, and steam is allowed to enter the tank. Heat transfer takes place with the surroundings such that the temperature in the tank remains constant at 180 °C at all times. The valve is closed when it is observed that one-third of the volume of the tank is occupied by liquid water. Find (a) the amount of steam that has entered the tank, and (b) the amount of heat transfer. 1400 kPa Steam 400°C Saturated vapor Qout V=0.08 m T, = 180°C

A piston-cylinder device initially contains 1 kg saturated liquid water at 220°C. Now heat is transferred to the water until the volume expands quadruple of its initial volume. Eventually, the cylinder contains saturated vapor only. Determine the volume at the final stage. (i) (ii) Determine the final temperature and pressure. (iii) Determine the internal energy change of the water. (iv) Sketch the T-v diagram and include all the related information.