The critical radius of insulation for cylindrical pipe is (where hi...

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The critical radius of insulation for cylindrical pipe is (where, h_i = heat transfer coefficient at inside of the pipe )

A. $$\frac{{\text{K}}}{{{{\text{h}}_0}}}$$

B. $$\frac{{2{\text{K}}}}{{{{\text{h}}_0}}}$$

C. $$\frac{{{{\text{h}}_{\text{i}}}}}{{\text{K}}}$$

D. $$\frac{{2{{\text{h}}_{\text{i}}}}}{{\text{K}}}$$

Answer: Option A

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