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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >COMPARISON OF STRATIFICATION IN A WATER TANK AND A PCM- WATER TANK
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COMPARISON OF STRATIFICATION IN A WATER TANK AND A PCM- WATER TANK

机译：水箱和PCM水箱分层的比较

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摘要

Most of the storage systems available on the market use water as storage medium. Enhancing the storage performance is necessary to increase the performance of most systems. The stratification phenomenon is employed to improve the efficiency of storage tanks. Heat at an intermediate temperature, not high enough to heat up the top layer, can still be used to heat the lower, colder layers. There are a lot of parameters to study the stratification in a water tank such as the Mix Number and the Richardson Number among others. The idea studied here was to use these stratification parameters to compare two tanks with the same dimensions during charging and discharging processes. One of them is a traditional water tank and the other is a PCM-water (a water tank with a Phase Change Material). A PCM is good because it has high energy density if there is a small temperature change, since then the latent heat is much larger than the sensible heat. On the other hand, the temperature change in the top layer of a hot water store with stratification is usually small as it is held as close as possible at or above the temperature for usage. In the system studied the Phase Change Material is placed at the top of the tank, therefore the advantages of the stratification still remain. The aim of this work is to demonstrate that the use of PCM in the upper part of a water tank holds or improves the benefit of the stratification phenomenon.
机译：市场上可用的大多数存储系统都使用水作为存储介质。必须提高存储性能才能提高大多数系统的性能。分层现象用于提高储罐的效率。中间温度的热量不足以加热顶层，仍然可以用来加热较低的较冷层。有很多参数可用于研究水箱中的分层，例如混合数和理查森数。此处研究的想法是使用这些分层参数来比较两个在充放电过程中具有相同尺寸的储罐。其中一个是传统的水箱，另一个是PCM水（带有相变材料的水箱）。 PCM之所以不错，是因为如果温度变化很小，它的能量密度就很高，因为那样的话，潜热要比显热大得多。另一方面，具有分层的热水储存器的顶层中的温度变化通常较小，这是因为其尽可能保持在等于或高于使用温度。在所研究的系统中，相变材料位于储罐的顶部，因此分层的优势仍然存在。这项工作的目的是证明在水箱上部使用PCM可以保持或改善分层现象的益处。

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