A box-shaped wood stove has dimensions of 0.75 mx 1.2 m x 0.4 m, an

emissivity of 0.85, and a surface temperature of 205°C. Calculate its rate of

radiation into the surrounding space.

8.4 kW

Explanation:

Using the Stefan-Boltzmann law,

P = εAσT4

Where:

P: Radiation Energy

ε: Emissivity of the Surface. Check emissivity table below of common materials.

A: Surface Area, in m^2.

σ: Stefan-Boltzmann Constant, σ=5.67 * 10-8 W/m2•K4

T: Temperature

Plugging in values,

P = 0.85 x 3.328 x 5.67 x 10^ (-8) x 205

P = 8383 W or 8.4 kW