Q5. The roof of a house consists of a 15-cm-thick concrete slab (k = 2 W/m C) that is 15 m wide and 20 m long. The convection heat transfer coefficients on the inner and outer surfaces of the roof are 5 and 12 W/m² C, respectively. On a clear winter night, the ambient air is reported to be at 10 °C, while the night sky temperature is 100 K. The house and the interior surfaces of the wall are maintained at a constant temperature of 20 °C. The emissivity of both surfaces of the concrete roof is 0.9. Considering both radiation and convection heat transfers, determine the rate of heat transfer through the roof, and the inner surface temperature of the roof Ans: Q-37,440 W.-7.3°C, and 7,-2.1°C
Q5. The roof of a house consists of a 15-cm-thick concrete slab (k = 2 W/m C) that is 15 m wide and 20 m long. The convection heat transfer coefficients on the inner and outer surfaces of the roof are 5 and 12 W/m² C, respectively. On a clear winter night, the ambient air is reported to be at 10 °C, while the night sky temperature is 100 K. The house and the interior surfaces of the wall are maintained at a constant temperature of 20 °C. The emissivity of both surfaces of the concrete roof is 0.9. Considering both radiation and convection heat transfers, determine the rate of heat transfer through the roof, and the inner surface temperature of the roof Ans: Q-37,440 W.-7.3°C, and 7,-2.1°C
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter8: Natural Convection
Section: Chapter Questions
Problem 8.9P
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