6.74 Figure P6.74 shows an air compressor and regenerative heat exchanger in a gas turbine system operating at steady state. Air flows from the compressor through the regenerator, and a separate stream of air passes though the regenerator in counterflow. Operating data are provided on the figure. Stray heat transfer to the surroundings and kinetic and potential energy effects can be neglected. The com- pressor power input is 6700 kW. Determine the mass flow rate of air entering the compressor, in kg/s, the temperature of the air exiting the

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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problem 6.74

regenerator at state 5, in K, and the rates of entropy production in the
behaves as an ideal gas with k=
bar and
in K, and the exit area, in m². For
ser, determine the rate of entropy
n flowing.
exchanger of an air-conditioning
of 0.2. The refrigerant stream
in counterflow through the heat
6.74 Figure P6.74 shows an air compressor and regenerative heat
exchanger in a gas turbine system operating at steady state. Air flows
from the compressor through the regenerator, and a separate stream
of air passes though the regenerator in counterflow. Operating data
are provided on the figure. Stray heat transfer to the surroundings
and kinetic and potential energy effects can be neglected. The com-
pressor power input is 6700 kW. Determine the mass flow rate of air
entering the compressor, in kg/s, the temperature of the air exiting the
and
regenerator, in kW/K.
6.79 A 180-ft' tank initially filled with
uated by a device known as a vacuum
compressor
are maintained at 70°F by heat transfe
vacuum pump discharges air to the su
and pressure of the surroundings, whic
tively. Determine the minimum theoret
Air in
T = 780 K
P4 = I bar
4 mg = m,
Ps = 1 bar
Regenerator
%3D
wwww
T = 620 K
P2 = 12 bar
wwww
Using Isentropic Processes/EfF
3
6.80 Air in a piston-cylinder assembl
T = 1800°R, p, = 2000 lbf/in., to p2 =
gas model, determine the temperature
from Table A-22E, and (b) a constan
T3 = 760 K
P3 = 12 bar
%3D
%3D
Compressor
Compare the values obtained in
parts
W
comp.in = 6700 kW
6.81 Air in a piston-cylinder assembl-
from state 1, where T = 35°C, to state
is one-tenth of the specific volume at =
model and assuming variations in sped
°C, and (b) the work, in kJ/kg.
Air in
%3D
T = 300 K
PI =1 bar
FIGURE P6.74
Transcribed Image Text:regenerator at state 5, in K, and the rates of entropy production in the behaves as an ideal gas with k= bar and in K, and the exit area, in m². For ser, determine the rate of entropy n flowing. exchanger of an air-conditioning of 0.2. The refrigerant stream in counterflow through the heat 6.74 Figure P6.74 shows an air compressor and regenerative heat exchanger in a gas turbine system operating at steady state. Air flows from the compressor through the regenerator, and a separate stream of air passes though the regenerator in counterflow. Operating data are provided on the figure. Stray heat transfer to the surroundings and kinetic and potential energy effects can be neglected. The com- pressor power input is 6700 kW. Determine the mass flow rate of air entering the compressor, in kg/s, the temperature of the air exiting the and regenerator, in kW/K. 6.79 A 180-ft' tank initially filled with uated by a device known as a vacuum compressor are maintained at 70°F by heat transfe vacuum pump discharges air to the su and pressure of the surroundings, whic tively. Determine the minimum theoret Air in T = 780 K P4 = I bar 4 mg = m, Ps = 1 bar Regenerator %3D wwww T = 620 K P2 = 12 bar wwww Using Isentropic Processes/EfF 3 6.80 Air in a piston-cylinder assembl T = 1800°R, p, = 2000 lbf/in., to p2 = gas model, determine the temperature from Table A-22E, and (b) a constan T3 = 760 K P3 = 12 bar %3D %3D Compressor Compare the values obtained in parts W comp.in = 6700 kW 6.81 Air in a piston-cylinder assembl- from state 1, where T = 35°C, to state is one-tenth of the specific volume at = model and assuming variations in sped °C, and (b) the work, in kJ/kg. Air in %3D T = 300 K PI =1 bar FIGURE P6.74
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