The image above represents total irradiation.

To compute for total irradiation, three essential parameters are needed and these parameters are **Reflectivity (ρ), Emissive Power of First Body (e)** and **Emissive Power of Second Body (e _{2}).**

The formula for calculating total irradiation:

G = ^{e2 + ρe} / _{1 – ρ}

Where:

G = Total Irradiation

ρ = Reflectivity

e = Emissive Power of First Body

e_{2} = Emissive Power of Second Body

Let’s solve an example;

Given that the reflectivity is 21, the emissive power of first body is 3 and the emissive power of second body is 9. Find the total irradiation?

This implies that;

ρ = Reflectivity = 21

e = Emissive Power of First Body = 3

e_{2} = Emissive Power of Second Body = 9

G = ^{e2 + ρe} / _{1 – ρ}

G = ^{9 + 21(3)} / _{1 – 21}

G = ^{9 + 63} / _{-20}

G = ^{72} / _{-20
}G = -3.6

Therefore, the **total irradiation **is **-3.6.**

Continue reading How to Calculate and Solve for Total Irradiation | Radiation Heat Transfer