Chapter 6, Problem 6.15P

A piston–cylinder assembly contains 0.9 kg of air at a temperature of 300 K and a pressure of 1 bar. The air is compressed to a state where the temperature is 470 K and the pressure is 6 bars. During the compression, there is a heat transfer from the air to the surroundings equal to 20 kJ. Using the ideal gas model for air, determine the work during the process, in kJ.

Ammonia, initially at 6 bar, 40°C undergoes a constant specific volume process to a final pressure of 2.75 bar.At the final state, determine the temperature, in °C, and the quality.

piston–cylinder assembly contains air, initially at 2.6 bar, 134 K, and a volume of 2.6 m3. The air undergoes a process to a state where the pressure is 0.8 bar, during which the pressure–volume relationship is pV = constant. Assuming ideal gas behavior for the air, determine the work for the process in kJ.

Five lbs of propane is contained in a closed, rigid tank initially at 80 lbf/in.2, 90°F. Heat transfer occurs until the final temperature in the tank is 0°F. Kinetic and potential energy effects are negligible.Determine the amount of energy transfer by heat, in Btu.

Five kg of water is contained in a piston–cylinder assembly, initially at 5 bar and 300°C. The water is slowly heated at constant pressure to a final state. The heat transfer for the process is 3260 kJ and kinetic and potential energy effects are negligible.Determine the final volume, in m3, and the work for the process, in kJ.

Current Attempt in Progress Water, initially saturated vapor at 2.5 bar, fills a closed, rigid container. The water is heated until its temperature is 440°C. For the water, determine the heat transfer, in kJ per kg of water. Kinetic and potential energy effects can be ignored. Q/m = i kJ/kg

Current Attempt in Progress A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 600°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. Part A * Your answer is incorrect. Determine the work for the constant-pressure process, in Btu. W12-104240.736 Hint Btu

Steam enters a turbine operating at steady state at 440°C and 30 bar and leaves as a saturated vapor at 0.08 bar. The turbine develops 9000 kW, and heat transfer from the turbine to the surroundings occurs at a rate of 590 kW. Neglect kinetic and potential energy changes from inlet to exit. a. Determine the exit temperature, in °C. b. Determine the volumetric flow rate of the steam at the inlet, in m³/s. T₁-440°C P₁=30 bar Qout 590 kW 2 X₂ 100%(sat.vapor) P₂=0.08 bar W turbine = 9000 kW

#1. A closed, rigid tank fitted with a fine-wire electric resistor is filled with Refrigerant 22, initially at -14 °C, a quality of 70%, and a volume of 0.01 m³. A 12-volt battery provides a 5-amp current to the resistor for 5 minutes. If the final temperature of the refrigerant is 40 °C, determine the heat transfer, in kJ, from the refrigerant to the surrounding environment. Refrigerant 22 T = -14°C x1 = 70% T2 = 40°C V = 0.01 m³ Resistor 12-volt battery provides a 5-amp current for 5 minutes. l000000000000000