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?

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.

A cylinder with a moveable piston on top, free to move up and down, contains one mole of an ideal gas initially at a temperature of Ti = 4.8°C. The cylinder is heated at a constant pressure of 1.00 atm, and it expands to eight times its original volume.(a)Calculate the new temperature Tf of the gas (in K). K(b)Calculate the work done (in kJ) on the gas during the expansion. kJ

8.Question 8Water is compressed in a piston/cylinder system with specific heat transfer into the system of 150 kJ/kg. Determine the specific work that occurs if the water is initially a superheated vapor at 2000 kPa and 300°C and the final state is 2500 kPa and 350°C.

15.Question 15A piston/cylinder system has an initial volume of 0.1 m^3 and contains nitrogen initially at 150 kPa, 25 °C. The piston compresses the nitrogen until the pressure reaches 1 MPa and the temperature is 150°C. During the compression process, heat is transferred from the nitrogen, and the work done on the nitrogen is 20 kJ. Determine the heat transfer of the process. The gas constant R for nitrogen is 0.2968 kJ/(kgK) and the specific heat c_v is 0.745 kJ/(kgK).1 point-8.4 kJ-4.2 kJ-3.7 kJ8.4 kJ

A sample of gas, initially with a volume of 1.0 L, undergoes a thermodynamic cycle. Find the work done by the gas on its environment during each stage of the cycle described below. (Enter your answers in J.)(a)First, the gas expands from a volume of 1.0 L to 6.5 L at a constant pressure of 6.0 atm. J(b)Second, the gas is cooled at constant volume until the pressure falls to 1.5 atm. J(c)Third, the gas is compressed at a constant pressure of 1.5 atm from a volume of 6.5 L to 1.0 L. (Note: Be careful of signs.) J(d)Finally, the gas is heated until its pressure increases from 1.5 atm to 6.0 atm at a constant volume. J(e)What is the net work done by the gas on its environment during the complete cycle described above? J