Critical radius of insulation

  1. 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?
  2. jcsd
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