Question: Brine at 16 o C circulating through copper pipes with walls 1.5 mm thick is used to keep a cold room at 0 o C.

Brine at –16^oC circulating through copper pipes with walls 1.5 mm thick is used to keep a cold room at 0^oC. The diameter of each pipe is very large compared to the thickness of its walls. By what fraction is the transfer of heat reduced when the pipes are coated with a 5-mm layer of ice?

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