plant are being dis- 7-81 Exhaust gases from a manufacturing charged through a 10-m-tall exhaust stack with outer diamet

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Plant Are Being Dis 7 81 Exhaust Gases From A Manufacturing Charged Through A 10 M Tall Exhaust Stack With Outer Diamet 1 (63.51 KiB) Viewed 41 times

plant are being dis- 7-81 Exhaust gases from a manufacturing charged through a 10-m-tall exhaust stack with outer diameter of 1 m. The exhaust gases are discharged at a rate of 1.2 kg/s, while temperature drop between inlet and exit of the exhaust stack is 30°C, and the constant pressure specific heat of the exhaust gasses is 1600 J/kg-K. On a particular day, wind at 27°C is blowing across the exhaust stack with a velocity of 10 m/s, while the outer surface of the exhaust stack experiences radia- tion with the surrounding at 27°C. Solar radiation is incident on the exhaust stack outer surface at a rate of 1400 W/m², and both the emissivity and solar absorptivity of the outer surface are 0.9. Determine the exhaust stack outer surface temperature. Evaluate the air properties at 80°C. Exhaust gases a₁ = ε = 0.9 L= 10 m 1==== FIGURE P7-81. Exhaust stack Tin-Tout=30°C Manufacturing plant Wind, 27°C