室内温熱環境形成寄与率CRIの自然対流が支配する室内の熱輸送性状への適用

摘要

従来、建物内の熱や物質の輸送（移動）は設備系、建物躯体系などrnを1次元に近似し、ネットワーク化したモデルで解析されることがrn多かった。TRNSYS、HASP／ACLD、EnergyPlus等のソフトウェアrnが、その代表例として挙げられる。この場合、3次元的様相を示すrn室内空間の状態量は、空調される室内では熱や物質がよく混合されrnることを仮定し、空間積分平均値などで代表される。そのため、こrnれらのモデル（以下、マクロモデルと記載）によるシミュレーションrnにおいては室内の空間分布は考慮されない。%The contribution ratio of indoor climate (CRI) based on CFD was developed to estimate the individual contribution of heat factors to any location inside a room. With the index of CRI, a more precise building energy simulation or real-time systematic control can be expected, within the defined accuracy by means of CFD but with a much reduced calculation load. However most of the studies related to CRI involve forced convection airflow fields. Thus the purpose of this study is to use the CRI to analyze the characteristics of heat transfer in natural convection air flow fields. In this study, A CFD simulation coupled with convection and radiation has been performed in an atrium without air conditioning or ventilation. Based on the fixed air flow field, the CRI of all heat sources are calculated by the new definition of CRI. As an application of CRI, an approximation method is proposed in this study to discuss the sensitivity of each heat source and the heat transfer by convection and radiation respectively. The accuracy of predicting air temperature by CRI is examined by comparing with CFD analysis.