The temperature of the air at the exit in


6.111 Figure P6.111 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. Assuming the ideal gas model for air with cp 5
0.24 Btu/lb ? 8R, and ignoring kinetic and potential energy
effects, determine

(a) the temperature of the air at the exit, in 8F,

(b) the exit diameter, in ft, and

(c) the rate of entropy production within the duct, in Btu/min ? 8R.

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Mechanical Engineering: The temperature of the air at the exit in
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