期刊
RENEWABLE ENERGY
卷 174, 期 -, 页码 573-589出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.04.061
关键词
Heat transfer enhancement; Gradient metal foam; Thermal energy storage; Multiple PCMs; Melting
资金
- National Natural Science Foundation of China [51641608]
- Fundamental Research Funds for the Central Universities of China [022019058, xzy022020026]
This study investigates the use of multiple phase change materials and gradient copper foam to accelerate the melting of phase change materials and improve heat transfer effectiveness. Results indicate that the utilization of single PCM shows better heat transfer effectiveness compared to radial multiple PCMs. Additionally, the negative gradient type of copper foam offers the best heat transfer effectiveness.
Most phase change materials employed in latent heat thermal energy storage suffer from poor thermal conductivity both in liquid and solid phases, leading to low heat transfer effectiveness. To overcome this limitation, multiple PCMs and gradient copper foam have been used to accelerate the melting of phase change materials and improve the heat transfer effectiveness. The heat transfer performance of shell-and-tube thermal energy storage unit consisting of radial multiple PCMs and single PCM was numeri-cally investigated. The utilization of single PCM showed better heat transfer effectiveness compared to that using radial multiple PCMs. The time saving for complete melting was up to 87.5%. The results implied that the radial multiple PCMs have no advantage in thermal storage compared to single PCM. Based on single PCM system, three types of gradients of copper foam, named positive gradient, non -gradient and negative gradient were designed in this study. The results indicated that the negative gradient type offers better heat transfer effectiveness than the non-gradient and positive gradient types. However, the temperature distribution of non-gradient type was more uniform compared to positive and negative types. Besides, an optimal configuration 0.99-0.97-0.89 of negative gradient was recommended to further reduce the complete melting time by 23.7%. (c) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据