多数室換気に局所相似モデルを適用した場合の通風量予測の精度検証及び戸建住宅の通風量解析への適用: 通風時の換気量予測法に関する研究(第4報)

摘要

In the paper, the COMIS-LDSM program was developed that the COMIS code was revised to calculate the discharge coefficients and airflow rates at inflow and outflow openings for arbitrary wind direction. Wind tunnel experiments were performed to validate the prediction accuracy of ventilation flow rates using the COMIS-LDSM and the conventional method. The conventional method overestimated the ventilation flow rates compared to those by COMIS-LDSM, especially when the approaching flow was not normal to the upwind openings. The simulation study was also carried out to calculate ventilation flow rates at a typical detached house in Tokyo in the intermediate season. The cumulative air change rates in the detached house calculated by COMIS-LDSM were predicted by reduction of 4％ compared with the conventional method.%本報では，換気回路網ソフトCOMISに局所相似モデルを組み込んだCOMIS-LDSMプログラムを作成し，通風量予測の精度検証と戸建住宅の通風量解析を行った。その結果として得られた主な知見は以下の通りである。(1)局所相似モデルを用いて2室の通風模型で通風量の予測精度を検討した。局所相似モデルは，流量係数を一定とした従来法に比べて，風向角が開口部に正対しない場合に通風量の予測精度が向上した。