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find only the following What is the total heat transfer to/from the building?

find only the following What is the total heat transfer to/from the building?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.57P
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find only the following

What is the total heat transfer to/from the building?

You have to do thermal analysis of a building near an arctic observatory, which has a footprint of 8-mx12-m and height of 4-m and oriented as shown. Because the wind direction and velocities are different on each side wall, the convection coefficient for each wall and roof are different. They are as follows h North 5 W/m².K, h South 24 W/m².K, 15 W/m².K, hEast hwest 12 W/m².K, and hRoof = 30 W/m².K, where the subscript indicate the corresponding wall/roof (for example, North is the convection coefficient for the North-facing wall). The ambient air temperature is -15°C. The sky temperature is -20°C. The solar irradiation is 350 W/m², which can be considered to be falling only on the roof and not on the walls. The surface temperature of the building is 10°C. Neglect heat transfer through the ground. What is the total heat transfer to/from the building? Is the building losing or gaining heat? What is the dominant mode of heat transfer? What is the ratio between the heat transfer rates through the roof and through the North wall? The solar absorptivity is 0.8, the emissivity of the wall and roof is 0.7. - = = = Total: 121463W from bldg It is losing heal Dominant & Convection Ráléo : 5.18 WEST 12 m SOUTH NORTH EAST 4m 8m
Transcribed Image Text:You have to do thermal analysis of a building near an arctic observatory, which has a footprint of 8-mx12-m and height of 4-m and oriented as shown. Because the wind direction and velocities are different on each side wall, the convection coefficient for each wall and roof are different. They are as follows h North 5 W/m².K, h South 24 W/m².K, 15 W/m².K, hEast hwest 12 W/m².K, and hRoof = 30 W/m².K, where the subscript indicate the corresponding wall/roof (for example, North is the convection coefficient for the North-facing wall). The ambient air temperature is -15°C. The sky temperature is -20°C. The solar irradiation is 350 W/m², which can be considered to be falling only on the roof and not on the walls. The surface temperature of the building is 10°C. Neglect heat transfer through the ground. What is the total heat transfer to/from the building? Is the building losing or gaining heat? What is the dominant mode of heat transfer? What is the ratio between the heat transfer rates through the roof and through the North wall? The solar absorptivity is 0.8, the emissivity of the wall and roof is 0.7. - = = = Total: 121463W from bldg It is losing heal Dominant & Convection Ráléo : 5.18 WEST 12 m SOUTH NORTH EAST 4m 8m
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