# Radiation Network Analysis Study Notes for Mechanical Engineering

By Akhil Gupta|Updated : November 23rd, 2021

Irradiation (G) is defined as the total thermal radiation incident upon a surface per unit time per unit area (in W/m2)

Irradiation (G) is defined as the total thermal radiation incident upon a surface per unit time per unit area (in W/m2)

The total thermal radiation leaving a surface per unit time & per unit area is called radiosity of the surface.

J = Emitted Energy + Reflected Part of Incident energy,

The net radiation heat exchange between the surface & all of its surroundings is given by,

Radiation heat exchange between two finite surfaces:

This space resistance shall exist in the space between two surfaces exchanging heat by radiation.

Therefore,

(i) Radiation Exchange Between two Infinitely Large Plane Surfaces:

(ii) TWO INFINITELY LONG CYLINDERS:

Therefore,

F12 = 1, F21 = 1

Since surfaces are very large

A1 = A2 = A3 = 1 and F13 = 1, F32 = 1

Therefore,

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Umesh BhanageAug 5, 2018

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