# Addition of heat and insulators

Explain the following terms;

(i) critical radius of insulation.

(ii) economic lagging thickness.

An electric wire has a diameter of 1.3 mm and is to be covered with insulation 2.5 mm thick of thermal conductivity 0.35 W/mK. If the outside surface heat transfer coefficient is 15.0 W/m2K, calculate the critical radius of insulation. Would the addition of the insulation expect to increase or decrease the rate of heat transfer from the wire? Justify your answer.

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Addition of heat:

Explain the following terms;

(i) critical radius of insulation.

(ii) economic lagging thickness.

An electric wire has a diameter of 1.3 mm and is to be covered with insulation 2.5 mm thick of thermal conductivity 0.35 W/mK. If the outside surface heat transfer coefficient is 15.0 W/m2K, calculate the critical radius of insulation. Would the addition ...

#### Solution Summary

This solution helps explain the critical radius of insulation and economic lagging thickness. It also helps calculate the increase of decrease in the rate of heat transfer would result from the addition of the insulation.