鉛直流入ディフューザを有する温度成層型蓄熱槽におけるCFD解析による性能予測手法の検討

摘要

本報では,鉛直流入ディフューザを有する温度成層型蓄熱槽の基本的な実験を行い,そのCFD解析結果と比較することによりCFD解析の妥当性を検証した.その上で,鉛直流入ディフューザを有する温度成層型蓄熱槽の設計資料を作成することを目的として,すでに提案している定流量•温度ステップ入力条件に対応した槽内混合モデルを適用し,槽の規模や流入条件が様々に変化した場合のCFD解析を行い,その計算結果から槽内鉛直温度分布を抽出し,モデルのパラメータ同定を行い,水平流入方式の場合と同様に蓄熱性能が予測できる可能性を示した。%A thermal energy storage (TES) air-conditioning system has been introduced into many buildings in Japan. The tank of water TES is classified into two types: a labyrinth type and a temperature-stratified type, according to the water-mixing conditions. This study focuses on the temperature-stratified water TES tank, where water with a different temperature is stored by the density difference without mixing. First, a series of experiments was conducted in order to examine the fundamental performance of the temperature-stratified thermal storage tank with a vertical-inflow inlet. Second, we verified the validity by comparing the transient temperature changes/distributions in the TES tank obtained by computational fluid dynamics (CFD) with some experiments. Third, on the basis of the above-mentioned results, a parameter required to predict the performance of the temperature-stratified thermal storage tank with a vertical-inflow inlet was identified from the CFD analysis results under various conditions. From the above, it was clarified that the parameter estimation equation/curve for predicting the performance of the temperature-stratified thermal storage tank with a vertical-inflow inlet is able to be created using a series of CFD analysis results.