有限要素法によるボイドスラブの非定常伝熱解析-4-空調ダクトとして利用する場合の熱性能

概要

論文の詳細を見る
The purpose of this report is to analyse the thermal characteristics of the void slab when the voids in the slab are used as air-conditioning heating and cooling ducts. A computer program has been developed for the successive calculation of the temperature variation of the void air from the inlet to outlet in the direction of void air flow. The program utilizes the two-dimensional finite element method (FEM) to compute transient heat conduction and temperature distribution of the cross section of the void slab. Using this computer prigram, the temperature variation of the void air for nine types of void slabs: uninsulated, upside of the slab insulated, the surface of the voids insulated, both upside of the slab and the surface of the voids insulated are all simulated under actual air-conditioning conditions for a commercial building. The following results are obtained based on the simulations. (1) When voids in an uninsulated roof slab are used as heating ducts, outlet air from the voids loses oveｒ 50% of supplied sensible heat. However, when the surface of the voids are insulated with 30mm thick foam polystyrene, heat loss is less than 10% of the supplied heat. (2) Even if the exterior surface of the roof void slab is pasted with 50mm thick insulation, both the rate of temperature drop of void air during heating and the temperature rise during cooling are great. To avoid the heat loss/gain from the void to the outside, insulation on the surface of the void as well as on the exterior surface of the roof should be required. (3) Even if the floor slab is uninsulated, surface condensation does not occur during cooling when the relative humidity of the room is kept under 70%.

著者

小原聡司
都城工業高等専門学校

有限要素法によるボイドスラブの非定常伝熱解析-4-空調ダクトとして利用する場合の熱性能

スポンサーリンク

概要

著者

関連論文

スポンサーリンク