By Hugo Hens
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Extra resources for Building physics : heat, air and moister : fundamentals and engineering methods with examples and exercises
A parabolic temperature curve. 7). 22) Opposite to the case with no heat dissipation, now the heat flow rate changes from point to point in the assembly. The boundary conditions give as value for the integration constants: C1 s2 s1 Φ d , 2 d C2 s1 Composite assembly with local heat source or sink If condensate is deposited in the interface between two layers in an assembly, heat of evaporation is released there. Drying afterwards causes the heat of evaporation to be absorbed again.
In forced convection, work exerted by an exterior source may compel heat to flow from low to high temperatures. Convection needs a medium. Actually, in liquids and gases, convection always includes conduction. Also in convection mode, heat transfer between molecules occurs by conduction. Radiation. Heat transfer, caused by the emission and absorption of electromagnetic waves. At temperatures above 0 K, each surface emits electromagnetic energy. Between surfaces at different temperatures, that emission results in heat exchanges.
10)? 11). To study steady state heat transfer in these cases, we have to return to: 2 2 2 Φ 2 2 2 x y z or, without dissipation: 2 2 2 0 x 2 y 2 z 2 For some very simple cases (single material, easy geometry, simple boundary conditions), this partial differential equation can be solved analytically. For the majority of building details, however, a numerical solution is the only option left. 10. Construction details where heat transfer develops in two and three dimensions.
Building physics : heat, air and moister : fundamentals and engineering methods with examples and exercises by Hugo Hens