FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Refrigerant 134a enters an insulated compressor operating at steady state as saturated
vapor at -12 °C at a rate of 18 kgm/min. At the compressor exit, the pressure of the
refrigerant is 5 bar. If the rate of entropy production must be kept less than 0.4842 kJ/K-
min, determine the possible range of values for isentropie compressor efficiency.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 Ib/s and is compressed
adiabatically to 650 lbf/in.?
If the power input is 2150 hp, determine for the compressor:
(a) the percent isentropic compressor efficiency and
(b) the rate of entropy production, in hp/ R.
Ignore kinetic and potential energy effects.
Consider 4.8 pounds per minute of water vapor at 100 lb/in², 500°F, and a velocity of 100 ft/s entering a nozzle operating at steady
state and expanding adiabatically to the exit, where the pressure is 40 lb/in². The isentropic nozzle efficiency is 95.0%.
Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min-°R.
Step 1
Determine the velocity of the steam at the exit, in ft/s.
Your answer is correct.
V₂- 2022.75
Hint
Step 2
* Your answer is incorrect.
G12
ft/s
Determine the rate of entropy production, in Btu/min-°R.
0.0052
Btu/min-R
Attempts: 2 of 4 used
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- Consider 4.8 pounds per minute of water vapor at 100 lb/in², 500°F, and a velocity of 100 ft/s entering a nozzle operating at steady state and expanding adiabatically to the exit, where the pressure is 40 lb/in². The isentropic nozzle efficiency is 95.0%. Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min.°R. Step 1 Determine the velocity of the steam at the exit, in ft/s. Your answer is correct. V₂ = 2022.75 Hint Step 2 * Your answer is incorrect. 012 ft/s Determine the rate of entropy production, in Btu/min.°R. i 0.0052 Btu/min.°R Attempts: 2 of 4 usedarrow_forwardAir at 200 kPa, 52°C, and a velocity of 305 m/s enters an insulated duct of varying cross-sectional area. The air exits at 100 kPa, 82°C. At the inlet, the cross-sectional area is 6.57 cm?. Assuming the ideal gas model for the air, determine: (a) the exit velocity, in m/s. (b) the rate of entropy production within the duct, in kW/K.arrow_forwardSteam enters a turbine operating at a steady state at a pressure of 4 MPa, at temperature of 400 degrees Celcius, and a velocity of 200m/s . Saturated vapor exits at 100 degrees Celcius with a velocity of 100 m/s. Heat transfer from the turbine to its surroundings takes place at the rate of 20 kJ/kg of steam at a location where the average surface temperature is 350K. (a) Write the energy and entropy balance equations for a control volume the includes only the turbine and its contents (b) Determine the work produced, in kJ/kg of steam flowing. (c) For a control volume that includes only the turbine and its contents, calculate the rate of entropy production in kJ/kg*K (d) Assume the turbine described above is located in a factory where the ambient temperature is 27 degrees Celcius. Determine the rate of entropy production in kj/kg*Kof steam, for an inlarged control volume that included the turbine and enough of its immediate surroundings so that heat transfer takes place from the…arrow_forward
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