Abstract
The thermal resistances of enclosed, concentric and eccentric cavities containing air at atmospheric pressure for the temperature range 20 to 160°C are discussed. The optimal configurations required to achieve maximum insulation for the vertical and horizontal configurations are indicated. For the latter, the optimal arrangement to achieve maximum insulation occurs with the axis of the heated inner cylinder displaced vertically upwards relative to that of the outer cylinder so that the eccentricity of the arrangement is 0·24.
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