FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Air at 1bar, 290K enters a compressor operating at steady state and is compressed adiabatically to 3bar. The isentropic
compressor efficiency is 80%. ignore kinetic and potential energy effects. Air can be modeled as ideal gas and k can be
chosen as 1.4, determine for the compressor
(a) the power input, in kJ/kg of air flowing. 134.26
(b) the amount of entropy produced, in kJ/kg-K of air flowing. 0.06564
Air modeled as an ideal gas enters a turbine operating at steady state at 1040 K, 278 kPa andexits at 120 kPa. The mass flow rate is 5.5 kg/s, and the power developed is 1200 kW. Stray heattransfer and kinetic and potential energy effects are negligible.Assuming k = 1.4, determine:(a) the temperature of the air at the turbine exit, in K.(b) the percent isentropic turbine efficiency.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 500 lbf/in.2
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.
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