6.72 WP Figure P6.72 shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well in- sulated and the pressure is very nearly 1 atm throughout. Assuming the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring kinetic and potential energy effects, determine (a) the temperature of the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of entropy production within the duct, in Btu/min· °R. %3D D = 4 ft V = 400 f/min T = 80°F page2 3 V= 400 ft/min T3 = ? 2 Insulation

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6.72 WP Figure P6.72 shows data for a portion of the ducting in
a ventilation system operating at steady state. The ducts are well in-
sulated and the pressure is very nearly 1 atm throughout. Assuming
the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring
kinetic and potential energy effects, determine (a) the temperature of
the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of
entropy production within the duct, in Btu/min· °R.
%3D
D = 4 ft
V = 400 f/min
T = 80°F
page2
3 V= 400 ft/min
T3 = ?
D3 = ?
Insulation
= 2000 ft/min
(AV)2
V2 = 600 f/min
T2 = 40°F
Transcribed Image Text:6.72 WP Figure P6.72 shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well in- sulated and the pressure is very nearly 1 atm throughout. Assuming the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring kinetic and potential energy effects, determine (a) the temperature of the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of entropy production within the duct, in Btu/min· °R. %3D D = 4 ft V = 400 f/min T = 80°F page2 3 V= 400 ft/min T3 = ? D3 = ? Insulation = 2000 ft/min (AV)2 V2 = 600 f/min T2 = 40°F
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