Question

Consider the attic of a home located in a hot climate. The floor of the attic is characterized by a width of L1= 10 m while the roof makes an angle of theta=30 degrees from the horizontal direction. The home owner wishes to reduce the heat load tot he home by adhering bright aluminum foil (of emissivity 0.07) onto the surfaces of the attic space. Prior to installation of the foil the surfaces are of emissivity 0.85
a) consider installation on the bottom of the attic roof only. Determine the ratio of the radiation heat transfer after to before the installation of the foil.
b) installation on the top of the attic floor
c) installation on both the roof bottom and floor top

Answer 1

I have attached the solution to the question in written format

a) The ratio of the radiation heat transfer after and before the installation of the foil is 0.104

b)Installation on the top of the attic floor is 0.0451

c)Installation on both the roof bottom and top floor is 0.057

What is meant by radiation of heat transfer?

Heat waves are emitted during the radiation heat transfer process and may be absorbed, reflected, or transmitted through a colder body. Earth is warmed by the sun using electromagnetic radiation. Heat waves come from warm bodies.

Thermal radiation is electromagnetic radiation that a substance emits as a result of its heat, the properties of which are dependent on the substance's temperature. The infrared radiation produced by a typical home heater or radiator is an example of thermal radiation.

Hence to conclude the radiation heat transfer after and before the installation of foil is 0.104

at the top of attic floor is 0.0451 and at the bottom and top of the roof is 0.057

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https://brainly.com/question/16055406

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