WhatsApp? 11:41 AM 19% 0 4d797dab-9bb4-... a61dbac6c7.jpg Files 8-53 Hot air at 60°C leaving the furnace of a house ente

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Whatsapp 11 41 Am 19 0 4d797dab 9bb4 A61dbac6c7 Jpg Files 8 53 Hot Air At 60 C Leaving The Furnace Of A House Ente 1 (112.64 KiB) Viewed 22 times

WhatsApp? 11:41 AM 19% 0 4d797dab-9bb4-... a61dbac6c7.jpg Files 8-53 Hot air at 60°C leaving the furnace of a house enters a 12-m-long section of a sheet metal duct of rectangular cross section 20 cm x 20 cm at an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer sur- face of the duct, whose emissivity is 0.3, is exposed to the cold air at 10°C in the basement, with a convection heat transfer co- efficient of 10 W/m² °C. Taking the walls of the basement to be at 10°C also, determine (a) the temperature at which the hot air will leave the basement and (b) the rate of heat loss from the hot air in the duct to the basement. 10°C h = 10 W/m² °C 12 m < Air duct 20 cm x 20 cm ε = 0.3 Hot air 60°C 4 m/s FIGURE P8-53 air at 10-C in die husement, with a corection heat transfer co efficient of 10 W/m Tng the walls of the hommt to be at 10 Caber, determine (a) the temperature at which the hot that will leave the basement and (b) the rate of heat loss trout the he air in the duct to the basement! AA Adrive.google.com Ć