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# Calculation of percentage heat reduction

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Water at 90 C flows through a 50mm bore steel pipe of wall thickness 8 mm. Ambient temperature is 18 C. Calculate the heat loss per metre length of pipe. Assuming that the surface heat transfer coefficients remain the same when a layer of hair felt 25mm thick is wrapped around the outside of the pipe, calculate the percentage reduction in heat loss for the pipe when insulated in such a manner.
Data:
a) the thermal conductivity of steel is 45 W/mK.
b) the thermal conductivity of felt is 0.05 W/mK.
c) the outside surface heat transfer coefficient is 20.0 W/m2K.
d) the inside surface heat transfer coefficient is 2500 W/m2K.

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Calculation of percentage heat reduction
Water at 90 C flows through a 50mm bore steel pipe of wall thickness 8 mm. Ambient temperature is 18 C. Calculate the heat loss per meter length of pipe. Assuming that the surface heat transfer coefficients remain the same when a layer of hair felt 25mm ...

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This solution helps with calculations of percentage heat reduction.

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