3.32 WP Water, initially saturated vapor at 4 bar, fills a closed, rigid container. The water is heated until its temperature is 400°C. For the water, determine the heat transfer, in kJ per kg of water. Kinetic and potential energy effects can be ignored.

A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 500°F. The water undergoes two processes in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid–vapor mixture with a quality of 40%. Neglect kinetic and potential energy effects.Determine the work and heat transfer for each process, all in Btu.

3.25 WP As shown in Fig. P3.25, Refrigerant 134a is contained in a piston-cylinder assembly, initially as saturated vapor. The refrigerant is slowly heated until its temperature is 160°C. Dur- ing the process, the piston moves smoothly in the cylinder. For the refrigerant, evaluate the work, in kJ/kg. Patm = 1 bar Piston Refrigerant 134a m FIGURE P3.25 Weight=471.1 N D = 0.02 m Initial: Saturated vapor Final: T₂ = 160°C

Referring to the figure shown below, water contained in a piston–cylinder assembly, initially at 1.5 bar and a quality of 20%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. The initial height, L1, is 0.05 m and the change in height, L2, is 0.02 m.   For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg.Kinetic and potential effects are negligible.

A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu. Part A Determine the work for the constant-pressure process, in Btu. W12-38.05 Your answer is correct. Hint Part B Your answer is correct. Determine the heat transfer for the constant-pressure process, in Btu. Q12--300.366 Part C Hint W23- Btu Determine the work for the constant volume process, in Btu. Save for Later Btu Btu Attempts: 2 of 4 used Attempts: 1 of 4 used Attempts: 0 of 4 used Submit Answer Part D The parts of this question must be completed in order. This part will be available when you complete the part above.

A piston-cylinder assembly contains Refrigerant 22, initially a saturated vapor at 5 bar. The refrigerant undergoes a process for which the pressure-specific volume relationship is pv = constant to a final pressure of 20 bar. Kinetic and potential energy effects can be neglected. a. For your schematic, provide a rough sketch of your system, with arrows indicating direction of work and heat (i.e, in or out of the system) b. Determine the work and heat transfer for the process, each in (kJ/kg)

2. A piston-cylinder assembly with stops (see figure) contains 1.54 kg of water initially occupying a volume of 1.25 m at a pressure of 1 bar (State 1). As the water in the assembly is heated, the pressure and temperature in the system remain constant until the piston contacts the stops. In this position (State 2), the quality, x2, is determined to be 92%. Heat continues to be added to the system at a constant volume until the system reaches a pressure of 1.5 bar (State 3). Determine the following quantities: а. X b. V2 (m2) C. W13 (kJ) d. Qu (kJ) e. Plot the results on a P-v diagram, labelling relevant P, T, and v values.

A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu. Part A * Your answer is incorrect. Determine the work for the constant-pressure process, in Btu. W12= 38.65 Btu

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