An air-conditioning system is to be filled from a rigid container that initially contains m1 kg of liquid R-134a at T°C. The valve connecting this container to the airconditioning system is now opened until the mass in the container is m2 kg, at which time the valve is closed. During this time, only liquid R-134a flows from the container. Presuming that the process is isothermal while the valve is open, determine the final quality of the R-134a in the container and the total heat transfer.

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 contains 1.25 kg water at 25°C with a constant load on the piston such that the pressure is 300 kPa. A nozzle in a line to the cylinder is opened to enable flow to the outside atmosphere at 100 kPa and 25°C. The process continues until 85% of the initial mass has flowed out. At this point, the temperature of water increased by 10°C. Assume that the process is done in an Water isobaric manner. Write the mass and energy balance equations and calculate the work (kJ) and heat (kJ) involved in the process if the exit velocity is 40 m/s. For compressed liquid, assume the substance is a saturated liquid at the given temperature.

An insulated piston-cylinder device contains 4.5 L of saturated liquid water at a constant pressure of 200 kPa. Water is stirred by a paddle wheel while a current of 20 A flows for 42 min through a resistor placed in the water. If 36% of the liquid is evaporated during this constant pressure process and the paddle-wheel work amounts to 280 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. H₂O = constant W P= Wh 4 Activate Wini