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4. Calculate the heat transfer in kJ per hour through a solid brick wall 6m long, 2.9m high and 250mm thick, when the outer surface temperature si at 5°C and the inner surface temperature is 20°C. The thermalconductivity of the brick is 0.6/W-°C. (Note: 1W̟= 1Joyle per sec). Answer: 2,255 kl/hr

4. Calculate the heat transfer in kJ per hour through a solid brick wall 6m long, 2.9m high and 250mm thick, when the outer surface temperature si at 5°C and the inner surface temperature is 20°C. The thermalconductivity of the brick is 0.6/W-°C. (Note: 1W̟= 1Joyle per sec). Answer: 2,255 kl/hr

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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4. Calculate the heat transfer in kJ per hour through a solid brick wall 6m long, 2.9m high and 250mm thick, when the outer surface temperature si at 5°C and the inner surface temperature is 20°C. The thermalconductivity of the brick is 0.6/W-°C. (Note: 1W̟= 1Joyle per sec). Answer: 2,255 kJ/hr 5. A gray body with surface temperature of 700°C and a surface area of 500cm? radiates in a large room whose surfaces are black and maintained at 100°C. If the emissivity factor is 0.6, calculate the radiative heat transfer between the hot surface and the room. Answer: 1491.6 W
Transcribed Image Text:4. Calculate the heat transfer in kJ per hour through a solid brick wall 6m long, 2.9m high and 250mm thick, when the outer surface temperature si at 5°C and the inner surface temperature is 20°C. The thermalconductivity of the brick is 0.6/W-°C. (Note: 1W̟= 1Joyle per sec). Answer: 2,255 kJ/hr 5. A gray body with surface temperature of 700°C and a surface area of 500cm? radiates in a large room whose surfaces are black and maintained at 100°C. If the emissivity factor is 0.6, calculate the radiative heat transfer between the hot surface and the room. Answer: 1491.6 W
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