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Critical radius of insulation 
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#1
Jun710, 10:36 AM

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In class, we were taught that the critical radius of insulation (found by differentiating thermal resistance WRT outer radius and setting to zero) gives a minimum resistance and thus and maximum heat loss i.e. it's not always productive to insulate your pipe.
but could it not also give a maximum resistance and therefore a minimum heat loss? differentiating again surely would tell you when it would be minimum and maximum? 


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