电热水器内部结构优化及储能特性研究
收稿日期: 2020-06-28
修回日期: 2020-08-21
网络出版日期: 2021-07-27
基金资助
安徽省自然科学基金项目(1508085QE95);国家自然科学基金项目(51306002)
Research on internal structure optimization and energy storage characteristics of electric water heater
Received date: 2020-06-28
Revised date: 2020-08-21
Online published: 2021-07-27
吴丽 , 何杰 , 鲁进利 , 韩亚芳 , 洪泽 . 电热水器内部结构优化及储能特性研究[J]. 过程工程学报, 2021 , 21(7) : 786 -793 . DOI: 10.12034/j.issn.1009-606X.220206
The energy consumption of electric water heater in China has a large proportion of total energy consumption. Therefore, it is of great significance to optimize the energy consumption process of electric water heater. The phase change materials (PCM) have the characteristics of high energy storage density and approximately constant temperature in the process of phase transition. In addition, the thermal conductivity of phase change materials can be enhanced by adding nanometer materials such as graphite. Therefore, it has obvious advantages in heat energy storage and utilization of phase change materials. So, the phase change energy storage technology can be applied to electric water heater to adjust the energy storage process and the goal of "peak shifting" also can be achieved. In this work, the energy storage characteristic of energy storage water heater with phase change material were researched employing numerical simulation method. Four different structural models were established and the influent of inlet and outlet piping construction, electric heating tube arrangement, insulation structure on flow and heat transfer characteristics of water in water heater were discussed. And the influence of energy storage layer thickness on energy storage of electric water heater were researched. The results showed that, compared with the vertical heating tube, the water temperature distribution of horizontal heating tube was more uniform during heating process, and the heating efficiency was improved by about 2.2%. When the inlet tube diameter increased to 1.5 times, the output status of hot water can be excellent improved, and the hot water output efficiency can be increased 17.9%. The addition of phase change materials can increase the water temperature by 10.6% under the condition of same heat preservation time (36 h). The results of this study can provide data support for structural optimization of electric water heater and application of phase change energy storage technology.
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