日射を考慮した非定常温熱気流解析手法の開発
非定常熱伝導解析機能の組み込みと住宅への適用
筆者等は，これまで，定常状態を仮定した日射・放射・対流連成解析手法を開発し，屋外の温熱環境解析に適用してきたが，更に表面温度の解析精度を向上させ，壁体等の蓄熱効果を考慮していくためには，非定常熱伝導を同時に解析する必要がある。また，建築における省エネルギーや快適性向上のためには断熱性・気密性能の評価が重要であり，壁体への蓄熱を伴う住宅内の非定常な熱的挙動の評価が重要となる。
以上のような背景から，本報では，屋外の温熱環境解析手法に新たに非定常解析機能を組み込むと共に，住宅への適用を試みた結果を報告する。
| キーワード： | 外断熱，ＣＦＤ，非定常解析，シミュレーション |
＊１ 技術センター 建築技術開発部 ニューフロンティア技術開発室
＊２ 技術センター 建築技術研究所 環境研究室
Development of Unsteady CFD Analysis in Consideration of Solar Radiation
Inclusion of Unsteady Conduction Analysis and Simulation of a Residential House
Authors have developed coupled computational fluid dynamics (CFD) analysis system, which includes solar radiation, thermal radiation and conduction and carried out outdoor thermal environment analysis under steady state conditions. It is obvious that further development is needed for more accurate analysis in consideration of thermal storage in walls. Also energy conservation in and thermal comfort in buildings depends greatly on thermal insulation and air-tightness. Unsteady CFD analysis is needed in consideration of unsteady conduction in walls.
In this paper, inclusion of unsteady conduction in walls into the coupled analysis is described. The thermal performance in a concrete house is evaluated by using the unsteady coupled analysis and the differences between exterior insulation and interior insulation are discussed.
| Keywords: | outside insulation, CFD, unsteady analysis, simulation |
*1 Advanced Technology Development Section, Building Technology Development Department, Technology Center
*2 Environmental Engineering Research Section, Building Engineering Research Institute, Technology Center
