The image above represents radiosity.

To compute for radiosity, three essential parameters are needed and these parameters are **Total Emissive Power (e), Reflectivity (ρ)** and **Total Irradiation (G).**

The formula for calculating radiosity:

J = e + ρG

Where:

J = Radiation Heat Transfer

e = Total Emissive Power

ρ = Reflectivity

G = Total Irradiation

Let’s solve an example;

Find the radiation heat transfer when the total emissive power is 12, the reflectivity is 10 and the total irradiation is 20.

This implies that;

e = Total Emissive Power = 12

ρ = Reflectivity = 10

G = Total Irradiation = 20

J = e + ρG

J = 12 + (10)(20)

J = 12 + 200

J = 212

Therefore, the **radiosity **is **212 W/m².**

**Calculating the Total Emissive Power when the Radiosity, the Reflectivity and the Total Irradiation is Given.**

e = J – ρG

Where:

e = Total Emissive Power

J = Radiation Heat Transfer

ρ = Reflectivity

G = Total Irradiation

Let’s solve an example;

Find the total emissive power when the radiation heat transfer is 32, the reflectivity is 10 and the total irradiation is 2.

This implies that;

J = Radiation Heat Transfer = 32

ρ = Reflectivity = 10

G = Total Irradiation = 2

e = J – ρG

e = 32 – (10)(2)

e = 32 – 20

e = 12

Therefore, the **total emissive power **is **12.**

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