This paper aims to determine the calorific power of a heating source and to establish an experimental procedure to measure heat transmission coefficients in low heat conductive materials. In our case, the source is a laterally isolated aluminum cylinder, which incorporates an internal electrical resistance for controlling the heat, adjusted to a preset temperature. We describe a simple model, based on the resolution of the differential equation for the heat balance, incorporating two gain and loss coefficients and its application to the steady response achieved, when a disk shaped plastic sample is placed between the heating element and a glass vessel with water, treating the set as a composite wall. In this way the calorific power values and the thermal conductivities of the plastic disk sample are obtained for temperatures ranging from 30 to 70°C.
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