有限要素法によるボイドスラブの非定常伝熱解析-3-スラブ内通過時における調和空気の温度変化

概要

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In the previous paper, we examined the thermal characteristics of the void slabs, based on the calculations of transient heat conduction and temperature distribution for the cross section of the slabs using the finite element method (FEM). In the present paper, we expand the capacity of the previous simulation program in order to calculate the void air temperature variation in the direction of void air flow. The temperature variations of void air are calculated when the voids are used as duct spaces of a heating or cooling air conditioning system. The following results are obtained. (1) When voids in an uninsulated floor slab are used as heating ducts, outlet air from the voids loses over 50% heat flux of the required sensible heat load. But when the inside surfaces of the voids are insulated with 30mm thick insulation material, the loss of the heat flux is only 10% of the required heat load. (2) Although the exterior surface of a roof void slab is pasted with 50mm thick insulation, both the rate of temperature drop of void air during heating and temperature rise during cooling of void air are very high. To avoid the heat loss or gain from the void to the outside, insulation on interior surface of the void as well as insulation on the exterior surface of the roof should be required.