Question

Which of the following is the correct relationship between thermal resistance and thermal conductivity?

(a) R = k/L

(b) R = k.L

(c) R = L/k

(d) R = L^2/k

I had been asked this question by my college professor while I was bunking the class.

My question is based upon Thermal Insulation in section Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

Answer 1

The correct answer is:

(c) R = L / k

The thermal resistance $R$ of a material is given by the formula $R=L/k$, where $L$ is the thickness of the material and $k$ is the thermal conductivity. This formula indicates that thermal resistance increases with material thickness and decreases with higher thermal conductivity.