Numerical and Experimental Investigation on a Combined Sensible and Latent Heat Storage Unit Integrated With Solar Water Heating System

被引:31
作者
Nallusamy, N. [1 ]
Velraj, R. [2 ]
机构
[1] Sri Venkateswara Coll Engn Pennalur, Dept Mech Engn, Sriperumbudur 602105, Tamil Nadu, India
[2] Anna Univ, Inst Energy Studies, Coll Engn, Chennai 600025, Tamil Nadu, India
来源
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME | 2009年 / 131卷 / 04期
关键词
finite difference methods; latent heat; phase change materials; solar absorber-convertors; solar heating; thermal energy storage; THERMAL-ENERGY STORAGE; PHASE-CHANGE MATERIALS; PACKED-BED; PERFORMANCE; DESIGN;
D O I
10.1115/1.3197600
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The present work investigates, theoretically and experimentally, the thermal performance of a packed bed combined sensible and latent heat storage unit, integrated with the solar water heating system. A one-dimensional porous medium approach with the finite difference technique is used to develop the numerical model to obtain the temperature profiles of both the phase change material (PCM) and heat transfer fluid (HTF), and the molten mass fraction of the PCM at any axial location of the cylindrical storage tank during the charging process. The model also incorporates the effect of the varying fluid inlet temperature to accommodate the actual conditions that prevails in the solar collector. Experimental apparatus utilizing paraffin as PCM, which is filled in high-density polyethylene spherical capsules, is constructed and integrated with a solar flat plate collector to conduct the experiments. The water used as HTF to transfer heat from the solar collector to the storage tank also acts as a sensible heat storage (SHS) material. The results of the numerical model are compared into the experimental results of the temperature profile for various porosities and HTF flow rates. It is found that the results of the numerical model are in good agreement with the experimental results. The performance parameters, such as instantaneous heat stored, cumulative heat stored, and charging rate are also studied in detail.
引用
收藏
页码:0410021 / 0410028
页数:8
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