Natural convection heat transfer coefficients in phase change material (PCM) modules with external vertical fins

被引：159

作者：

Castell, Albert ^{[1
]}

Sole, Cristian ^{[1
]}

Medrano, Marc ^{[1
]}

Roca, Joan ^{[1
]}

Cabeza, Luisa F. ^{[1
]}

Garcia, Daniel ^{[2
]}

机构：

[1] Univ Lleida, Dept Informat & Engn Ind, Lleida 25001, Spain

[2] Univ Politecn Cataluna, Dept Projectes Engn, Terrassa 08222, Spain

来源：

APPLIED THERMAL ENGINEERING | 2008年 / 28卷 / 13期

关键词：

Nusselt number; Rayleigh number; experimental correlation; heat transfer enhancement; phase change material (PCM);

D O I：

10.1016/j.applthermaleng.2007.11.004

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

To determine the heat transfer coefficient by natural convection for specific geometries, experimental correlations are used. No correlations were found in the literature for the geometries studied in this work. These geometries consisted of a cylindrical module of 88 mm of diameter and 315 mm height with external vertical fins of 310 min height and 20 and 40 min length. To determine the heat transfer coefficient by natural convection, experimental work was done. This module, containing PCM (sodium acetate trihydrate), was situated in the middle upper part of a cylindrical water tank of 440 mm of diameter and 450 mm height. The calculated heat transfer coefficient changed by using external fins, as the heat transfer surface was increased. The temperature variation of the PCM and the water are presented as a function of time, and the heat transfer coefficient for different fins is presented as a function of the temperature difference. Experimental correlations were obtained, presenting the Nusselt number as a function of different dimensionless numbers. Different correlations were analysed to find which one fit better to the experimental data. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1676 / 1686

页数：11

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