Studies on the Internal Characteristics of a Temperature Stratification-type Thermal Storage Water Tank : Part 2-The Thermal Characteristics for the Case of Hot Water Input

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  • 温度成層型蓄熱水槽の内部特性に関する研究 : 第2報-温水入力の場合の熱的特性
  • 温度成層型蓄熱水槽の内部特性に関する研究-2-温水入力の場合の熱的特性
  • オンド セイソウガタ チクネツ スイソウ ノ ナイブ トクセイ ニ カンスル

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Abstract

The thermal characteristics of a rectangular thermal storage tank was investigated experimentally by measuring the transient response of liquid temperature, for the case in which hot water was discharged through a rectangular duct into the upper part of the tank filled with cold water. Experimental parameters varied included the width of duct, the horizontal length of tank, the hot-cold water temperature difference and the flow rate of liquid. From the experimental results, the semi-empirical equation suitable for predicting the thermal storage efficiency in the arbitrary region of the tank, ηV', was finally deduced as the function of the Archimedes number based on inflow conditions, Ar_0, the Peclet number of liquid, Pe, and two dimensionless geometric parameters, φ_1 and φ_2. It was realized for the case (d_e/b)^2Ar_0<44, the occurrence of shortcut flow brought about a rapid decrease in the thermal storage efficiency.

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