報告書番号

T62

タイトル（和文）

放射冷房空間における熱放射環境の数値評価手法

タイトル（英文）

A numerical analysis method for evaluating thermal environment in the radiant cooled space

概要 （図表や脚注は「報告書全文」に掲載しております）

省エネで快適な放射冷房空間の熱放射環境の解析・評価手法を新たに開発した。具体的な成果を以下に示す。（1）室内の壁面や居室者などの表面における放射、対流および伝導による伝熱現象を模擬し、気温や物体表面の温度分布などの熱環境を、少ない計算メモリ・計算時間で適切に予測できるプログラムを開発した。本プログラムの特長は、放射冷房空間におけるもっとも重要な要素である放射伝熱現象を正確に扱えるようにした点にある。（2）放射冷房された室内を適切に評価するため、居室者のモデルを新たに開発した。（3）放射冷房された室内の居室者の温熱感覚を的確に評価するために、上記で開発した居室者モデルを用いて計算される放熱量をもとに、従来すでに提案されているPMV指標を修正する方法を考案した。

概要 （英文）

An analytical method for evaluating a thermal radiant environment in a radiant-cooled space was developed and verified to be suitable for practical design of a comfortable radiant-cooled space. The main results are as follows:(1) The calculation method of view factors considering a complicated obstacle was developed for analyzing radiation heat transfer in the radiant-cooled space. View factors between elements are calculated by a method that combines a line-integrating method and a unique technique that enables us to understand the visibility between elements by geometrical considerations. View factors calculated by the above method were applied to analyze the thermal radiant environment in a radiant-cooled room. The mutual thermal influence between various objects was evaluated quantitatively. (2) A simplified body model was developed for evaluating heat exchange on the human body surface. The model was constructed by combining cylindrical and rectangular parts to simulate the shape of the human body accurately. The body temperature and thermal resistance of clothing were defined respectively on the basis of measured values. They were incorporated in the model as thermal properties. The validity of the model was verified by comparing analyzed body temperatures of the model with measured temperatures of real subjects.(3) A modified PMV index was proposed for evaluating the thermal sensation of occupants in the radiant-cooled space. To modify the PMV index, a new calculation process for radiation heat exchange of the human body was introduced by using the body model developed previously, and was incorporated into the original calculation process of the PMV index. The modified PMV index predicted the thermal sensation of real subjects more accurately than the PMV index. The practical validity of the modified PMV index was examined. (4) A composite evaluation method was developed by integrating the series of methods and models developed in this study. By applying the method to an actual radiant-cooled space, the influences of various building characteristics on the indoor thermal radiant environment and the thermal sensation of occupants were analyzed using the composite method. On the basis of the analysis results, some plans for improving the present situation were recommended.

報告者

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