FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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One kilogram of ammonia initially at 8.0 bar and 50oC undergoes a process to 3.7 bar, 20oC while being rapidly expanded in a piston–cylinder assembly. Heat transfer between the ammonia and its surroundings occurs at an average temperature of 40oC. The work done by the ammonia is 40 kJ. Kinetic and potential energy effects can be ignored. Determine the heat transfer, in kJ, and the entropy production, in kJ/K.
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- Pravinbhaiarrow_forwardA closed, rigid tank fitted with a paddle wheel contains 2.0 kg of air, initially at 200°C, 1 bar. During an interval of 10 minutes, the paddle wheel transfers energy to the air at a rate of 1 kW. During this time interval, the air also receives energy by heat transfer at a rate of 0.5 kW. These are the only energy transfers. Assume the ideal gas model for the air, and no overall changes in kinetic or potential energy. Do not assume specific heats are constant. Determine the change in specific internal energy for the air, in kJ/kg, and the final temperature of the air, in °C.arrow_forwardTwo kg of water is contained in a piston-cylinder assembly, initially at 10 bar and O °C. The water is slowly heated at constant pressure to a final state. If the heat ansfer for the process is 1740 kJ, determine the temperature at the final state, in °C, d the work, in kJ. Kinetic and potential energy effects are negligible. Hint: in this oblem, the transferred heat equals the enthalpy change.arrow_forward
- 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/kgarrow_forwardA closed, rigid tank is filled with only saturated vapor (water), initially at 20 bar, is cooled until the pressure is 3 bar. Determine the specific internal energy at state 1 (u1) in kJ/kg Determine the quality x at state 2 Determine the specific internal energy at state 2(u2) in kJ/kg Determine the energy transfer by heat/mass during the process (kJ/kg)arrow_forwardpiston–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.arrow_forward
- A closed, rigid tank contains Refrigerant 134a, initially at 100°C. The refrigerant is cooled until it becomes saturated vapor at 20°C. For the refrigerant, determine the initial and final pressures, each in bar, and the heat transfer, in kJ/kg. Kinetic and potential energy effects can be ignored.arrow_forwardA 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.arrow_forwardA 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 60%. Neglect kinetic and potential energy effects.Determine the work and heat transfer for each process, all in Btu.arrow_forward
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