A furnace wall is composed of three layers, 25cm firebrick (k=1.65W/m·K), followed by 20 cm of kaolin insulating brick(k=0.078W/m·K), and finally 15 cm of masonry brick(k=1.25W/m·K). The temperature of the inner wall surface is 935°C and outside surface is at 35 °C. Assume that surface area is 1m². (1)What is the energy transfer rate q(W)? (2) What are the temperatures at the two contacting surfaces?

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Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.