Numerical simulation study on optimizing charging process of the direct contact mobilized thermal energy storage
Numerical simulation study on optimizing charging process of the direct contact mobilized thermal energy storage
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DOI：
10.1016/j.apenergy.2013.01.020
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发表时间：
2013-12-01
期刊：
影响因子：
11.2
通讯作者：
Yan, Jinyue
中科院分区：
文献类型：
--
作者：
Guo, Shaopeng;Li, Hailong;Yan, Jinyue
移动式储热系统被认为是向分布式供热用户供热的一种有吸引力的替代方案，特别是在利用工业废热作为热源的情况下。从我们以往的研究得知，M-TES系统的充电时间是放电时间的四倍以上，这是M-TES应用的关键问题。为了改善系统的充填性能，进一步了解熔化过程的机理，在有限元分析软件Ansys Fluent中建立了二维数值模拟模型。通过实验测量对该模型进行了验证。结果表明，该模型可用于工程分析。利用验证后的模型，研究了增加热油流量、在充电前开辟通道以及增加壁面加热等不同方案来缩短充气时间。相应地，根据数值模拟，与热油流量为9.8 L/min的实验相比，充电时间分别减少了约25%、26%和29%。此外，如果最后两个选项可以同时应用，在不改变热油流量的情况下，可能会缩短一半以上的熔化时间。(C)2013爱思唯尔有限公司。保留所有权利。
Mobilized thermal energy storage (M-TES) system is considered as an attractive alternative to supply heat to distributed heat users, especially when the waste heat from industries is used as a heat source. From our previous study it was known that the charging time of M-TES system was more than four times of the discharging time, which was a critical issue for the application of M-TES. To improve the charging performance of the system and further understand the mechanism of melting process, a 2-dimensional (2D) numerical simulation model was developed in ANSYS FLUENT. The model was validated by the experimental measurements. The results showed that the model could be used for the engineering analysis. With the validated model, different options to shorten the charging time were investigated including increasing flow rate of thermal oil, creating channels before charging and adding wall heating. Correspondingly, around 25%, 26% and 29% of the charging time could be reduced respectively compared to the experiment with a thermal oil flow rate of 9.8 L/min, according to the numerical simulation. In addition, if the last two options could be applied simultaneously, more than half of the melting time might be shortened without changing the flow rate of thermal oil. (C) 2013 Elsevier Ltd. All rights reserved.