A-C line Liquid R-134a A rigid container containing 6.6 kg of saturated liquid R-134a at 24°C is used to fill an air-conditioning system. A valve is opened and allows liquid R-134a to escape the tank into the A-C line until only 0.49 kg of R-134a remains in the tank, at which point the valve is closed. During the process, heat transfer is allowed to occur maintain the tank temperature at 24°C. What is the quality of the refrigerant inside the tank at the end of the process? What is the total heat transfer for this process? KJ

Two different piston – cylinder devices each contain 1 kg of air. Initially, the temperature T = 300 K and %3D pressure P= 100 kPa of the gases are both the same in both cylinders. However, one of the cylinders is insulated and the other is not. Now, both of these gases inside the cylinders are let to expand in quasi- equilibrium processes until their pressures reach to 50 kPa. The expansion process takes place isentropically in the cylinder 1 and in the cylinder 2 the expansion process takes place reversible and isothermally. a) Plot in Excel the P-V diagrams of both processes. (Take k = cp / cv = 1.4) %3D b) Calculate the work done by the gases.

Refrigerant-134a (R-134a) enters the expansion valve of a refrigeration system at 650 kPa with a quality of 20%. The pressure of R-134a at the outlet is 200 kPa. a)Determine the temperature of R-134a at the outlet in oC. Calculate the difference of internal energy between the outlet and inlet in kJ/kg

A 0.78 m³ tank initially contains water at 260°C and a quality of 0.81. A valve at the top of the tank is opened and allows for saturated vapor at 260°C to leave the tank. The tank is maintained isothermally during this process until the tank is filled with only saturated vapor at 260⁰ C. What is the mass of steam that leaves the tank during this process? How much heated is added to the tank during this process. KJ kg