Calculate the total clear sky irradiation of a surface tilted at an angle of 60° from the horizontal located atCaribou, ME, on July 21 at 2:00 P.M. solar time. The latitude for the given location is 68.02° N. The surfacefaces the southwest. Neglect reflected radiation. Use Gae = CGND Fws for diffuse solar radiation.Answer: G, = 252 Btu/hr-ft', Gae = 26.58 Btu/hr-ft', Total irradiation = 278.58 Btu/hr-ft%3D

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the total clear sky irradiation of a surface tilted at an angle of 60° from the horizontal located at ME, on July 21 at 2:00 P.M. solar time. The latitude for the given location is 68.02° N. The surface outhwest. Neglect reflected radiation. Use Gae = CGND Fws for diffuse solar radiation. o = 252 Btu/hr-ft", Gae = 26.58 Btu/hr-ft", Total irradiation = 278.58 Btu/hr-ft

the total clear sky irradiation of a surface tilted at an angle of 60° from the horizontal located at ME, on July 21 at 2:00 P.M. solar time. The latitude for the given location is 68.02° N. The surface outhwest. Neglect reflected radiation. Use Gae = CGND Fws for diffuse solar radiation. o = 252 Btu/hr-ft", Gae = 26.58 Btu/hr-ft", Total irradiation = 278.58 Btu/hr-ft

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.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.66P

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11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure. The gas mixture consists of by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K, calculate (a) the effective emissivity of the gas at its temperature, (b) the effective absorptivity of the gas to radiation from the 1390 K surface, (c) the effective absorptivity of the gas to radiation from the 278 K surface, and (d) the net rate of heat transfer to the gas per square meter of surface area.
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