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4. A rigid vessel contains 0.46 lbm of air at 80 F and 200 psia. The...
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
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 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
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)...
Consider steady flow of gas in a constant diameter pipe. Explain why the density decrease from inlet to outlet. (2pts) 15 lbm of Trichlorofluoromethane at 50 Psia and-10 °F held in a rigid contai...
Consider steady flow of gas in a constant diameter pipe. Explain why the density decrease from inlet to outlet. (2pts) 15 lbm of Trichlorofluoromethane at 50 Psia and-10 °F held in a rigid container is heated to 50 F. Determine the final pressure and volume of the container. (ALL WORK MUST BE IN ENGLISH UNITS). (4 pts) .
Consider steady flow of gas in a constant diameter pipe. Explain why the density decrease from inlet to outlet. (2pts) 15 lbm...
Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion...
Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion to 2,340 deg.F at constant pressure, then expanded in an 89% efficient turbine to atmospheric (14.7 psia) pressure. Part of the work of the turbine is used to compress ambient air at 70 deg.F and 14.7 psia to store it underground with an 85% efficient compressor. The air that is stored underground loses heat to the surroundings. The turbine powers an electric generator that...
. A small rigid vessel contains air and is fitted with a pressure gage. When the vessel is outside where the temperature is 100 F, the pressure gage reads 17.4 psig. When the vessel is placed in the...
. A small rigid vessel contains air and is fitted with a pressure gage. When the vessel is outside where the temperature is 100 F, the pressure gage reads 17.4 psig. When the vessel is placed in the freezer, the pressure gage reads 10.8 psig. What is the temperature in the freezer? a. -15 F b. 0F d. 7 F
. A small rigid vessel contains air and is fitted with a pressure gage. When the vessel is outside where...
1. An industrial plant needs 20,000 lbm of saturated steam at 280°F per hour for heating...
1. An industrial plant needs 20,000 lbm of saturated steam at 280°F per hour for heating purposes and ten MW of electrical power. A small turbine system is to be designed to handle both of these needs. Steam is supplied to a turbine at 400 psia pressure from a boiler and expanded until 280°F saturated steam is obtained whereupon the steam needed for heating is extracted. The rest of the steam is expanded in a second turbine to a condenser...
An insulated 1.7 m3 rigid tank contains air at 500 kPa and 50oC. A valve connected...
An insulated 1.7 m3 rigid tank contains air at 500 kPa and 50oC. A valve connected to the tank is now opened and air is allowed to escape until the pressure inside drops to 200 kPa. The air temperature during this process is maintained constant by an electric resistance heater placed in the tank. a. Determine the mass of air initially, m1 in kg. b. How much air escaped from the tank, mout in kg. c. Determine the electrical work...
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
Consider steady flow of gas in a constant diameter pipe. Explain why the density decrease from inlet to outlet. (2pts) 15 lbm of Trichlorofluoromethane at 50 Psia and-10 °F held in a rigid container is heated to 50 F. Determine the final pressure and volume of the container. (ALL WORK MUST BE IN ENGLISH UNITS). (4 pts) .
Consider steady flow of gas in a constant diameter pipe. Explain why the density decrease from inlet to outlet. (2pts) 15 lbm...
. A small rigid vessel contains air and is fitted with a pressure gage. When the vessel is outside where the temperature is 100 F, the pressure gage reads 17.4 psig. When the vessel is placed in the freezer, the pressure gage reads 10.8 psig. What is the temperature in the freezer? a. -15 F b. 0F d. 7 F
. A small rigid vessel contains air and is fitted with a pressure gage. When the vessel is outside where...
1. An industrial plant needs 20,000 lbm of saturated steam at 280°F per hour for heating purposes and ten MW of electrical power. A small turbine system is to be designed to handle both of these needs. Steam is supplied to a turbine at 400 psia pressure from a boiler and expanded until 280°F saturated steam is obtained whereupon the steam needed for heating is extracted. The rest of the steam is expanded in a second turbine to a condenser...
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