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Air is compressed isothermally from 13 psia and 55°F to 74 psia in a reversible steadyflow...
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)...
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...
18) Nitrogen (MW-48) is isothermally compressed from 200°F and 40 psia to 100 psia. Calculate the...
18) Nitrogen (MW-48) is isothermally compressed from 200°F and 40 psia to 100 psia. Calculate the final specific volume, the change in entropy and the heat transferred in the process. 8) A steel collar is press fitted onto a steel shaft. The modulus of elasticity of steel-36 x 106 Ib/in2. The collar has an internal diameter- 2.498 in, and the shaft has an outside diameter -2.500 in. The outside diameter of the collar = 4.000 in. (a) Determine the radial...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is its final pressure? (Standard conditions of air is 68 °F or 293.15 K and 14.7 psia or 101 kPa abs)
You got this question right in the previous attempt. Check my work View previous attempt Required...
You got this question right in the previous attempt. Check my work View previous attempt Required information Part 1 of 2 An air-standard cycle with constant specific heats at room temperature is executed in a closed system and is composed of the following four processes: 1-2 v=Constant heat addition from 14.7 psia and 80°F in the amount of 300 Btu/ibm 2-3 P=Constant heat addition to 3100 R 3-4 Isentropic expansion to 14.7 psia 4-1 P=Constant heat rejection to initial state...
**PLEASE ANSWER ALL SUB-QUESTIONS AND EXPLAIN STEP BY STEP. THANK YOU!** QUESTION 6 One mole of an ideal gas is compres...
**PLEASE ANSWER ALL SUB-QUESTIONS AND EXPLAIN STEP BY STEP.
THANK YOU!**
QUESTION 6 One mole of an ideal gas is compressed isothermally but irreversibly at 130 oC from 2.5 bar to 6.5 bar in a piston/cylinder device. The work required is 30 % greater than the work of reversible, isothermal compression. The heat transferred from the gas during compression flows to a heat reservoir at 25 °C. Calculate the entropy changes of the gas, the heat reservoir, and AStotal
QUESTION...
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...
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is...
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is at 400 kPa and 300 K with a volume of 0.3 m3. Air is first expanded isothermally to 150 kPa, then compressed adiabatically to the initial pressure, and finally compressed at the constant pressure to the initial state. Accounting for the variation of specific heats with temperature, determine the work and heat transfer for each process.
Air is being compressed in a piston-cylinder device in a reversible and adiabatic manner. During the...
Air is being compressed in a piston-cylinder device in a reversible and adiabatic manner. During the process both the temperature and pressure of the gas increase, while the volume is decreasing. If the initial volume and temperature of the air are 3 m3 and 13 °C, respectively, and the final volume is measured to be 0.3 m3, the final temperature of the air is
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. Determine the compressor work per unit mass for (a) isentropic compression with k 1.4, (b) a compressor with 85% isentropic efficiency, (c) two-stage compression (100 kPa to 300 kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors. (50 points) 2.
18) Nitrogen (MW-48) is isothermally compressed from 200°F and 40 psia to 100 psia. Calculate the final specific volume, the change in entropy and the heat transferred in the process. 8) A steel collar is press fitted onto a steel shaft. The modulus of elasticity of steel-36 x 106 Ib/in2. The collar has an internal diameter- 2.498 in, and the shaft has an outside diameter -2.500 in. The outside diameter of the collar = 4.000 in. (a) Determine the radial...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is its final pressure? (Standard conditions of air is 68 °F or 293.15 K and 14.7 psia or 101 kPa abs)
You got this question right in the previous attempt. Check my work View previous attempt Required information Part 1 of 2 An air-standard cycle with constant specific heats at room temperature is executed in a closed system and is composed of the following four processes: 1-2 v=Constant heat addition from 14.7 psia and 80°F in the amount of 300 Btu/ibm 2-3 P=Constant heat addition to 3100 R 3-4 Isentropic expansion to 14.7 psia 4-1 P=Constant heat rejection to initial state...
**PLEASE ANSWER ALL SUB-QUESTIONS AND EXPLAIN STEP BY STEP.
THANK YOU!**
QUESTION 6 One mole of an ideal gas is compressed isothermally but irreversibly at 130 oC from 2.5 bar to 6.5 bar in a piston/cylinder device. The work required is 30 % greater than the work of reversible, isothermal compression. The heat transferred from the gas during compression flows to a heat reservoir at 25 °C. Calculate the entropy changes of the gas, the heat reservoir, and AStotal
QUESTION...
Air is compressed steadily by a reversible compressor from an inlet state of 100 kPa and 300 K to an exit pressure of 900 kPa. Determine the compressor work per unit mass for (a) isentropic compression with k 1.4, (b) a compressor with 85% isentropic efficiency, (c) two-stage compression (100 kPa to 300 kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors. (50 points) 2.
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