Insulating power of a wall (Fig. 10A.6), the insulating power of a wall can be measured by

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Insulating power of a wall (Fig. 10A.6), the "insulating power" of a wall can be measured by means of the arrangement shown in the figure One places a plastic panel against the wall. In the panel two thermocouples are mounted flush with the panel surfaces. The thermal conductivity and thickness of the plastic panel are known. From the measured steady-state temperatures shown in the figure, calculate: 

(a) The steady-state heat flux through the wall (and panel). 

(b) The "thermal resistance" (wall thickness divided by thermal conductivity).

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