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1.5: A piston-cylinder assembly undergoes a polytropic expansion from 120 lbf/in?, 2.75 ft/lb to 20 lbf/in...
Considering that 0.1 kg of gas contained within a piston-cylinder assembly undergoes a polytropic expansion process...
Considering that 0.1 kg of gas contained within a piston-cylinder assembly undergoes a polytropic expansion process with polytropic exponent n=2. The initial state has specific internal energy 10 J/kg, pressure 100 Pa, specific volume 2 m3/kg, and the final state has specific internal energy 5 J/kg and pressure 50 Pa. 1. Sketch the process on a P − V diagram 2. Determine the total heat transfer into or out of the gas during the process.
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed...
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed by an adiabatic compression. The adiabatic compression can be modeled as a polytropic process PVn constant with a volume exponent n 1.4. At state 1 the pressure of the system is P1 60 psi, the volume is Vi 8.868 ft3 and the internal energy U 1630.6 BTU. The work output during the constant pressure process is W2-75.2 BTU and the heat transfer input for...
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume...
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume relation is p. V..2=constant. The initial volume is 0.5 m², the initial temperature is 500 K and initial pressure is 600 kPa. The final pressure is 300 kPa. Determine (a) the mass of air, in kg (b) the boundary work, in kJ (c) the final temperature in K and (d) the heat transfer, in kJ.
Ammonia in a piston-cylinder assembly undergoes two processes in series. At the initial state, pi- 120...
Ammonia in a piston-cylinder assembly undergoes two processes in series. At the initial state, pi- 120 lbfin? and the quality is 100%. Process 1-2 occurs at constant volume until the temperature is 100°F. The second process, from state 2 to state 3, occurs at constant temperature, with Q23-98.9 Btu, until the quality is again 100%. Kinetic and potential energy effects are negligible. For 2.2 lb of ammonia, determine (a) the heat transfer for Process 1-2, in Btu, (b) the work...
Ammonia is contained in a piston-cylinder assembly. The ammonia undergoes a reversible, isobaric process from an...
Ammonia is contained in a piston-cylinder assembly. The ammonia undergoes a reversible, isobaric process from an initial pressure of 30 lbf/in2 and volume of 4 ft3/lb to a final temperature of 70° F. The mass of ammonia is 0.35 lb. Determine the amount of work done on the ammonia in Btu, the amount of heat transfer to the ammonia in Btu, and the temperature at which the heat transfer occurs in °F. Assume that the heat transfer occurs at a...
A piston-cylinder assembly contains air, initially at 60 lbf/in2, 900°R, and a volume of 0.05 ft3....
A piston-cylinder assembly contains air, initially at 60 lbf/in2, 900°R, and a volume of 0.05 ft3. The air undergoes a process to a state where the final volume is 0.10 ft3. The process is polytropic with n=1.4. Assuming ideal gas behavior for the air: a. Draw the process in the p-V diagram and write the engineering model. a. Clearly label the states and indicate the direction of the process. b. Determine the mass of the air, in lb
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is...
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is pv1.1 = constant. The mass of the gas is 0.4 lb and the following data are known: p1 = 160 lbf/in.2, V1 = 1 ft3, and p2 = 390 lbf/in.2 During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb.
Problem 3.052 A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 450°F....
Problem 3.052 A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 450°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.
Problem 3.052 A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 450°F....
Problem 3.052 A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 450°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 50%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu
A piston-cylinder assembly contains air modeled as an ideal gas. The air undergoes a power cycle...
A piston-cylinder assembly contains air modeled as an ideal gas. The air undergoes a power cycle consisting of four processes in series: • Process 1-2: Constant-temperature expansion at 600 K from p1 = 0.5 MPa to p2 = 0.4 MPa. • Process 2-3: Polytropic expansion with n = 1.3 to p3 = 0.3 MPa. • Process 3-4: Constant-pressure compression to ν4 = ν1. • Process 4-1: Constant-volume heating. a) Sketch the cycle on a p-ν diagram. b) Calculate the work...
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed by an adiabatic compression. The adiabatic compression can be modeled as a polytropic process PVn constant with a volume exponent n 1.4. At state 1 the pressure of the system is P1 60 psi, the volume is Vi 8.868 ft3 and the internal energy U 1630.6 BTU. The work output during the constant pressure process is W2-75.2 BTU and the heat transfer input for...
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume relation is p. V..2=constant. The initial volume is 0.5 m², the initial temperature is 500 K and initial pressure is 600 kPa. The final pressure is 300 kPa. Determine (a) the mass of air, in kg (b) the boundary work, in kJ (c) the final temperature in K and (d) the heat transfer, in kJ.
Ammonia in a piston-cylinder assembly undergoes two processes in series. At the initial state, pi- 120 lbfin? and the quality is 100%. Process 1-2 occurs at constant volume until the temperature is 100°F. The second process, from state 2 to state 3, occurs at constant temperature, with Q23-98.9 Btu, until the quality is again 100%. Kinetic and potential energy effects are negligible. For 2.2 lb of ammonia, determine (a) the heat transfer for Process 1-2, in Btu, (b) the work...
Problem 3.052 A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.2 and 450°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 50%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu
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