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In: Mechanical Engineering
Air enters a duct operating at steady state with a mass flow rate of 3 kg/s...
Air enters a duct operating at steady state with a mass flow rate of 3 kg/s a pressure of 1.2 bar and a temperature of 320 K the air exits at a pressure of .8 bar and a temperature of 360 K and there is a heat loss of 20 kW to the surroundings which are at a temperature of 300 K modeling air as an ideal gas determine the entropy production of the process in kilowatts per
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samet mamat answered 14 hours agoRelated Solutions
At steady state, air at 200 kPa, 330 K, and mass flow rate of 0.5 kg/s...
At steady state, air at 200 kPa, 330 K, and mass flow rate of
0.5 kg/s enters an insulated duct having differing inlet and exit
cross-sectional areas. The inlet cross-sectional area is 6
cm2. At the duct exit, the pressure of the air is 100
kPa and the velocity is 250 m/s.
Neglecting potential energy effects and modeling air as an ideal
gas with constant cp = 1.008 kJ/kg · K,
determine:
(a) the velocity of the air at the...
Methane (CH4) enters a compressor operating at steady state with a mass flow rate of 170...
Methane (CH4) enters a compressor operating at steady state with
a mass flow rate of 170 lbm/hr. The methane enters the compressor
at p1 = 15 lbf/in2 , T1 = 80F and exits at p2 = 100 lbf/in2 . The
work input to the compressor is 15 hp. Assume ideal gas behavior
for the methane with constant specific heats (cp = 0.538 Btu/lbm·R,
cv = 0.414 Btu/lbm·R). Kinetic and potential energy effects are
negligible and the compressor is insulated
1)Determine...
Hot air flows with a mass flow rate of 0.05 kg/s through an insulated square duct...
Hot air flows with a mass flow rate of 0.05 kg/s through an
insulated square duct with side of 0.15m, the hot air enters at 103
oC and after a distance of 5m, cools to 85
oC. The heat transfer coefficient between the duct outer
surface and the ambient air (Tair = 0 oC) is
6 W/m2 K.
Calculate the heat transfer coefficient between hot air and duct
inner wall.
Air Cp = 1.011 KJ/kg K; air k = 0.0306...
Consider the following combined cycle. The mass flow rate of air is 73 kg/s. Air enters...
Consider the following combined cycle. The mass flow rate of air
is 73 kg/s. Air enters the compressor at state 1 with Patm =1 atm
and Tamb = 20°C. The compressor has a pressure ratio of 7.5 and an
efficiency ?c = 0.85. Air enters the combustor and is heated to a
temperature TH = 1250°C. The turbine has an efficiency of ?t,1 =
0.87. The air leaving the turbine enters the steam boiler where it
transfers heat to the...
An air compressor is operating at a steady state. The air enters at with a volumetric...
An air compressor is operating at a steady state. The air enters
at with a volumetric flow rate 1.2 m^3/s at 170 kPa and 22 degrees
celsius with negligible velocity and leaves at 1500 kPa with
velocity of 200 m/s. The power to the compressor is 60 kW and the
compressor is cooled at a rate of 15 kJ/kg. Determine the exit
area.
Air enters a horizontal, constant-diameter heating duct operating at steady state at 280 K, 1 bar,...
Air enters a horizontal, constant-diameter heating duct
operating at steady state at 280 K, 1 bar, with a volumetric flow
rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The
flow area is 0.05 m2.
Assuming the ideal gas model with k = 1.4 for the air,
determine:
(a) the mass flow rate, in kg/s,
(b) the velocity at the inlet and exit, each in m/s, and
(c) the rate of heat transfer to the air, in kW
Saturated water vapor at 300F enters a compressor operating at steady state with a mass flow...
Saturated water vapor at 300F enters a compressor operating at
steady state with a mass flow rate of 5 lb/s and is compressed
adiabatically to 750 psi.
Determine:
a) The percent isentropic compressor efficiency.
b) The rate of entropy production, in hp/R.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow...
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 750 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.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow...
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 650 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.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow...
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 650 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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