The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV₂ = 3600 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb-ºR and ignore kinetic and potential energy effects.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and
the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV₂ = 3600 ft3/min. Assume the ideal gas
model for air with cp = 0.24 Btu/lb-ºR and ignore kinetic and potential energy effects.
(AV)₁ = 5000 ft³/min Air, Cp=0.24 Btu/lb R
T₁ = 80°F
p=1 atm
2
(AV)₂
T₂ = 40°F
ft³/min
3 V3 = 400 ft/min
T3 = ?
-Insulation
Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min.°R.
Transcribed Image Text:The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV₂ = 3600 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb-ºR and ignore kinetic and potential energy effects. (AV)₁ = 5000 ft³/min Air, Cp=0.24 Btu/lb R T₁ = 80°F p=1 atm 2 (AV)₂ T₂ = 40°F ft³/min 3 V3 = 400 ft/min T3 = ? -Insulation Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min.°R.
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