• # question_answer Upto the critical radius of insulation: A) Added insulation increases heat loss.B) Added insulation decreases heat loss.C) Convection heat loss is less than conduction heat loss.D) Heat flux decreases.

$Q=\frac{2\pi L({{t}_{1}}-{{t}_{0}})}{\left[ \frac{In\,\left( \frac{{{r}_{2}}}{{{r}_{1}}} \right)}{k}+\frac{1}{{{h}_{0}}{{r}_{2}}} \right]}$ Conductive thermal resistance increases with increasing ${{r}_{2}}$ and convective thermal resistance decreases with increasing${{r}_{2}}$. $Thus\,\,{{Q}_{convective}}<{{Q}_{conductive}}$