Hot air at 1 bar and 80 degree Celcius enters a 8 m long uninsulated square duct of cross-section 20 cm x 20 cm that passes through the attic of a house at a rate of 150 L/s. The duct is observed to be constant surface temperature of 60 degrees Celcius. Determine (a) air film coefficient (b) the exit temperature of air (c) logarithmic mean temperature difference (d) the rate of heat loss from the duct to the attic space.From Table A-18, for air gives, density, ρ = 1.009 kg/m^3thermal conductivity, k = 0.0297 W/m degree celciusviscosity, v = 2.06 x 10^-5 m^2/sspecific heat, Cp = 1008 J/kg degree celciusPrandtl no., Pr = 0.706 hot air inair outt ?t 80°CV, 150L/mint 60°CL, 8m longa, 20 cmairt?a, 20 cmCross-section at EXIT

Answered: Image /qna-images/answer/a27c34d6-0224-4be6-a5b4-2e6671dbcff0.jpg

Answered: Hot air at 1 bar and 80 degree Celcius…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Question

Hot air at 1 bar and 80 degree Celcius enters a 8 m long uninsulated square duct of cross-section 20 cm x 20 cm that passes through the attic of a house at a rate of 150 L/s. The duct is observed to be constant surface temperature of 60 degrees Celcius. Determine (a) air film coefficient (b) the exit temperature of air (c) logarithmic mean temperature difference (d) the rate of heat loss from the duct to the attic space.

From Table A-18, for air gives,

density, ρ = 1.009 kg/m^3
thermal conductivity, k = 0.0297 W/m degree celcius
viscosity, v = 2.06 x 10^-5 m^2/s
specific heat, Cp = 1008 J/kg degree celcius
Prandtl no., Pr = 0.706