
Concept explainers
The net rate of radiation heat transfer between two surfaces and the horizontal surface and the surroundings.

Explanation of Solution
Given:
The length of edge
The width of horizontal surface
The width of vertical surface
The emissivity of horizontal surface
The emissivity of vertical surface is
The emissivity of surrounding
The temperature of horizontal surface
The temperature of vertical surface
The temperature of surrounding
Calculation:
Calculate the ratio of length to width of horizontal surface
Calculate the ratio of length to width of vertical surface
Refer Table 21-35 “View factor between coaxial parallel disks.”.
Obtain the following values of view factors of different surfaces corresponding to the ratio
Calculate the surface area of horizontal surface
Calculate the surface area of vertical surface
Calculate the surface area of third connecting surface
Calculate the view factor from surface
Calculate the view factor from surface
Calculate the view factor from surface
Calculate the view factor from surface
Calculate the view factor from surface
Calculate the radiosity of vertical surface
Calculate the radiosity of horizontal surface
Calculate the radiosity for third surface
Calculate the radiosity for horizontal surface
Calculate the net rate of heat transfer between two surfaces
Calculate the net rate of heat transfer between horizontal surface and surrounding
Thus, the net rate of radiation heat transfer between two surfaces is
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Chapter 21 Solutions
Fundamentals of Thermal-Fluid Sciences
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