A rigid container with a volume of 2 m3 contains twenty kilograms of refrigerant 134aat an initial pressure of 240 kPa. The container is cooled until the pressure of therefrigerant is 100 kPa. Determine:a) The initial temperature of the refrigerant; (5 marks)b) The final state (i.e., compressed liquid, saturated liquid, saturated mixtureetc.) of the refrigerant, giving your reasoning; and (3 marks)c) The heat transfer associated with the process. (14 marks)d) Sketch the process on a P-v diagram. (3 marks)

A rigid, well-insulated cylinder is divided into two chambers bya fixed dividing wall. As the cylinder is well-insulated, heat transferoccurs only through the dividing wall: no heat is lost to thesurroundings. The first chamber contains 11 m3 of air at 800 kPa and0 °C. The second chamber contains 1 m3 of refrigerant R134a at 800kPa and 60 °C. The refrigerant is allowed to cool until the pressure ofthe R134a chamber reaches 600 kPa.a) Assuming air is an ideal gas, calculate the initial mass of air inthe chamber.b) Calculate the initial mass of R134a in the chamber.c) Considering the whole cylinder as the system, use the first lawof thermodynamics to derive a relationship between the internalenergy of the air and the internal energy of the refrigerant.d) Determine the temperature of the air chamber when the R134areaches 600 kPa.e) Has the system reached thermal equilibrium? Give yourreasoningHeat R134a1 m3P = 800 kPaT = 60 CAir11 m3P = 800 kPaT = 0 C

7.Question 7A rigid container holds an ideal gas with c_v = 0.75 kJ/(kgK). The container is cooled from 110 ℃ to 20 ℃. Find the specific heat transfer (kJ/kg) for the process. 1 point-96 kJ/kg96 kJ/kg67.5 kJ/kg-67.5 kJ/kg

Q1. An insulated piston-cylinder device contains 0.1 m3 of saturated R-134a vapour at a pressure of 0.75 MPa. The refrigerant is now allowed to expand at constant entropy (isentropically) until the pressure drops to 0.36 MPa. a) Sketch a diagram of the process indicating the system and direction of all relevant energy and/or mass flows. List all your assumptions. b) Determine the final temperature in the cylinder. c) How much work is done by the refrigerant?

1) A container of volume V1= 2 liters is filled with an ideal gas under the pressure P1 =0.8 Bar at the temperature T1 =300K. 1)Calculate the quantity of matter present in this container. 2) The previous container noted (1) is connected by a tube of negligible volume to a container (2) of volume V2 =V1 and initially containing the same gas at the same temperature and pressure. The container (2) is heated to the temperature T2 =360K. We neglect the thermal exchanges between the two containers via the tube. Calculate the quantities of matter and the pressure in each container at mechanical equilibrium.

A mass of 8kg gas expands within a flexible container so that p-vrelationship is of the form pv1.2=c. The initial pressure is 1000kPa and initialvolume is 1m3. The final pressure is 5kPa. If specific internal energy of gasdecreases by 40 kJ/kg, find the heat transfer.