A composite plane wall consists of a 5-in-thick layer of insulation (k, = 0.029 Btu/h ft. °R) and a 0.75-in.-thick layer of siding (k, = 0.058 Btu/h ft. °R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 8°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of surface area. Part A Determine at steady state the temperature at the interface of the two layers, in °F. T₂ = i Save for Later °F Attempts: 0 of 4 used Submit Answer

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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.