A rigid tank contains 20 lbm of air at 50 psia and 80 F. The air...
A rigid tank contains 20 lbm of air at 50 psia and 80 F. The air is now heated until its pressure doubles. Determine (a) the volume of the tank and (b) the amount of heat transfer.
Answers: 80 ft^3, 1898 Btu
Homework Answers
4. A rigid vessel contains 0.46 lbm of air at 80 F and 200 psia. The...
4. A rigid vessel contains 0.46 lbm of air at 80 F and 200 psia. The air is heated to 160 F with an electric resistance heater. How much energy is added? a. 2.7 Btu b. 6.3 Btu c. 3.9 Btu d. 8.8 Btu 5. What is the final pressure of the air in problem 4? a. 200 psia b. 400 psia c. 230 psia d. 318 psia
4. A rigid vessel contains 0.46 lbm of air at 80 F...
A rigid tank initially contains 29 lbm of air at 83 ∘ ∘ F and 16.8...
A rigid tank initially contains 29 lbm of air at 83 ∘ ∘ F and 16.8 psia. Additional air is added to the tank and now the temperature is 99.6 ∘ ∘ F and the pressure is now 27.72 psia. a) What is the volume of the tank ____________ft 3 ft3 b) How much mass was added to the tank? _____________lbm
A rigid tank contains a partition that divides the tank into two sections, each having a...
A rigid tank contains a partition that divides the tank into two sections, each having a volume of 2 ft3 . The left side contains 1.5 lbm of refrigerant R-134a at a pressure of 50 psia, and the right side contains 4 lbm of refrigerant R-134a at 30 psia. The partition is removed and the contents are allowed to mix. Heat transfer occurs with the surroundings until the entire tank contents reach a new equilibrium temperature of 60 °F. For...
A 17-ft3 rigid tank initially contains saturated refrigerant-134a vapor at 160 psia. As a result of...
A 17-ft3 rigid tank initially contains saturated refrigerant-134a vapor at 160 psia. As a result of heat transfer from the refrigerant, the pressure drops to 50 psia. a.) Determine the final temperature. Use data from refrigerant tables. (Please provide an answer before moving on to the next part.) b.) Determine the amount of refrigerant that has condensed.(lbm) (Please provide an answer before moving on to the next part.) c.) Determine the heat transfer. (Btu)
A frictionless cylinder-plunger device contains 0.88 lbm of carbon dioxide initially at 20 psia and 40...
A frictionless cylinder-plunger device contains 0.88 lbm of carbon dioxide initially at 20 psia and 40 ° F. Heat is supplied from a heat source at 740 ° F until the volume occupied by the gas doubles. Determine, in Btu, (a) the quantity of heat supplied, (b) the exergy of the final state, and (c) the reversible useful work associated with the global process if the process is at constant pressure, To = 60 ° F and Po = 14.7...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then doubles in a polytropic process to a final pressure of 200 psia. How much heat was added, in units of Btu. Use a negative sign if heat actually removed instead of added. Selected Answer: 753.48 Correct Answer: 1,293.8 - 1096
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and...
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and a quality of 0.92. The water is heated until its pressure has increased to 120 psia. Calculate the following quantities: (a) the mass of liquid water in the tank at the initial state (b) the mass of the water vapor in the tank at the initial state (c) the initial temperature of the water in the tank (d) the volume of the tank (e)...
A rigid tank contains a two-phase mixture of water and steam at a quality of 0.65...
A rigid tank contains a two-phase mixture of water and steam at a quality of 0.65 and a pressure of 20 psia. The mass of the mixture is 0.26 lbm. The mixture is heated until the final quality is 0.95. Compute the final pressure and the heat added. Please show formulas. This will help tremendously.
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia...
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia and 200* F. Assuming air can be treated as an ideal gas and has variable specific heat. a) Determine the specific work output of the actual turbine (Btu/lbm). b) Determine the amount of specific entropy generation during the irreversible process (Btu/lbm R). c) Determine the isentropic efficiency of this turbine (%). d) Suppose the turbine now operates as an ideal compressor (reversible and adiabatic)...
Problem 5(25 points) A rigid tank initially contains a partition that separates water at two different...
Problem 5(25 points) A rigid tank initially contains a partition that separates water at two different states. One side of the partition initially contains 4.5 lbm of steam at 150 psia and 600°F. The other side of the partition contains 7 lbm of saturated liquid 25 percent. The pressure at the final state is 50 psia. -vapor mixture at 300°F with a vapor mass fraction of partition is removed, and mixing occurs until equilibrium is established. The a) b) Determine...
4. A rigid vessel contains 0.46 lbm of air at 80 F and 200 psia. The air is heated to 160 F with an electric resistance heater. How much energy is added? a. 2.7 Btu b. 6.3 Btu c. 3.9 Btu d. 8.8 Btu 5. What is the final pressure of the air in problem 4? a. 200 psia b. 400 psia c. 230 psia d. 318 psia
4. A rigid vessel contains 0.46 lbm of air at 80 F...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then doubles in a polytropic process to a final pressure of 200 psia. How much heat was added, in units of Btu. Use a negative sign if heat actually removed instead of added. Selected Answer: 753.48 Correct Answer: 1,293.8 - 1096
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and a quality of 0.92. The water is heated until its pressure has increased to 120 psia. Calculate the following quantities: (a) the mass of liquid water in the tank at the initial state (b) the mass of the water vapor in the tank at the initial state (c) the initial temperature of the water in the tank (d) the volume of the tank (e)...
Problem 5(25 points) A rigid tank initially contains a partition that separates water at two different states. One side of the partition initially contains 4.5 lbm of steam at 150 psia and 600°F. The other side of the partition contains 7 lbm of saturated liquid 25 percent. The pressure at the final state is 50 psia. -vapor mixture at 300°F with a vapor mass fraction of partition is removed, and mixing occurs until equilibrium is established. The a) b) Determine...
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