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Effect of different deflector structures on temperature stratification of a passive solar water heater
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects ( IF 2.9 ) Pub Date : 2021-09-14 , DOI: 10.1080/15567036.2021.1973152
Yunze Shen 1 , Zhilin Sun 1 , Leilei Fan 1
Affiliation  

ABSTRACT

This paper focuses on the optimization of the deflector structures and effect of four different deflectors within the tank on the temperature stratification. Four different deflectors inside the tank are numerically studied and analyzed through computational fluid dynamics simulation, which are: (a) A type deflector (a lamina), (b) B type deflector (a lamina with two fins 90 degree apart), (c) C type deflector (a lamina with four fins 90 degree apart) and (d) D type deflector (a lamina with four fins 120 degree apart). The comparison of the tanks with different deflectors and without deflector are proposed in terms of the temperature distribution of the tank, the flow pattern of the tank, the velocity distribution of the tube opening, Stratification number and natural convection Grashof number. The temperature stratification is enhanced by placing the different deflectors inside the tank. Results illustrate that the temperature stratification depends on the effect of different deflectors on the natural convection. The Stratification number improves with the increase of the natural convection Grashof number. Compared to the tank without the deflector, the Stratification number and natural convection Grashof number of the solar water heater improve by 18.90% and 13.95%, respectively, are reported for the tank with the B type deflector or C type deflector.



中文翻译:

不同导流板结构对被动式太阳能热水器温度分层的影响

摘要

本文重点研究了导流板结构的优化以及罐内四种不同导流板对温度分层的影响。通过计算流体动力学模拟对罐内四种不同的导流板进行了数值研究和分析,它们是:(a)A型导流板(a片),(b)B型导流片(两个翅片相距90度的片),(c ) C 型导流板(具有四个相隔 90 度的翅片的薄板)和 (d) D 型导流板(具有四个相隔 120 度的翅片的薄板)。从罐体温度分布、罐体流型、管口速度分布、分层数和自然对流格拉肖夫数等方面提出了带不同导流板和不带导流板罐的比较。通过在罐内放置不同的导流板来增强温度分层。结果表明,温度分层取决于不同偏转器对自然对流的影响。分层数随着自然对流 Grashof 数的增加而提高。与不带导流板的水箱相比,安装B型导流板或C型导流板的水箱,太阳能热水器的分层数和自然对流格拉肖夫数分别提高了18.90%和13.95%。

更新日期:2021-09-14
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