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 = 4000 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb·°R and ignore kinetic and potential energy effects. Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min·°R.
