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A cooling coil is made of steel tubing 38x2.5 mm. Its outer surface is to be covered by an acid resistant layer, 0.5 mm

A cooling coil is made of steel tubing 38x2.5 mm. Its outer surface is to be covered by an acid resistant layer, 0.5 mm thick and heat conductivity 0.6 W.m.K. What is going to be the change of the resistance of the tube wall to heat transfer?

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