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首页> 外文期刊>Energy Conversion & Management >EFFECT OF BAFFLE PLATE ON THE PERFORMANCE OF A TRIANGULAR BUILT-IN-STORAGE SOLAR WATER HEATER
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EFFECT OF BAFFLE PLATE ON THE PERFORMANCE OF A TRIANGULAR BUILT-IN-STORAGE SOLAR WATER HEATER

机译：挡板对三角形内置式太阳能热水器性能的影响

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摘要

The triangular design of a solar water heater not only enhances the overall gain to the system but also improves the natural convection between the absorbing plate and the water, leading to better performance of the system. A night insulation cover is used at the top surface of the heater to reduce the losses from the system during the off-sunshine hours. Another way to reduce the losses from the system is by using an insulating baffle plate in the tank. This plate divides the tank water into two portions, the water above this plate is known as the upper column and below is known as the lower column. The water of the two columns is in contact with each other with the help of the incoming and outgoing vents provided in the baffle plate. This plate also suppresses losses from the lower column during the off-sunshine hours. In this paper, we have studied the effect of a baffle plate on the performance of a triangular built-in-storage solar water heater. To obtain the thermal behavior of the system, the energy balance equations are written at the different nodes, and the well-known finite difference forward time step marching technique is used for their solution. The proposed system is studied by varying the vent area, the water mass in the two columns and under a constant flow rate for different durations. The effects of the thermal conductivity and thickness of the baffle plate on the water temperature are also investigated. It is found that the presence of the baffle plate greatly improves the system performance during off-sunshine hours.
机译：太阳能热水器的三角形设计不仅增加了系统的整体收益，而且还改善了吸收板和水之间的自然对流，从而提高了系统的性能。在加热器的顶面使用了一个夜间隔热罩，以减少在阳光不足时系统的损失。减少系统损失的另一种方法是在水箱中使用隔热挡板。该板将储罐水分成两部分，该板上方的水被称为上塔，而下方的水被称为下塔。借助挡板中提供的进排气孔，两塔的水相互接触。该板还可以抑制在阳光照射下下塔的损失。在本文中，我们研究了挡板对三角形内置式太阳能热水器性能的影响。为了获得系统的热性能，将能量平衡方程写在不同的节点上，并使用众所周知的有限差分正向时间步长行进技术进行求解。通过改变排气面积，两根塔中的水量以及在恒定流速下持续不同时间来研究所提出的系统。还研究了导流板的导热系数和厚度对水温的影响。已经发现，挡板的存在极大地改善了在阳光不足时的系统性能。

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