Heat charge and release characteristics of household off-peak electricity thermal storage heating system

doi:10.16085/j.issn.1000-6613.2023-0335

Abstract

Abstract:

A household off-peak electricity thermal storage heating system (HOETSHS) based on phase change material (PCM) was proposed. Its heat storage/release characteristics and heating performance were comprehensively explored through numerical simulation and experiments. Fluent was used to numerical simulation of the heat release process of HOETSHS. The effect of inlet air velocity, inlet temperature and thermal storage materials on the heat release performance of the thermal storage heating system were studied. The correctness of the simulated working condition was verified by experimental research. The results suggested that the inlet air velocity had a significant effect on the heat release performance of the system. As the inlet air velocity increased, the average outlet temperature of the system decreased, and the immediate heating load increased. However, the effect of the inlet temperature on the heat release performance of the system was relatively weak. Composite phase change material (CPCM) was more suitable as heat storage medium for the phase change thermal storage heating system than pure ammonium aluminum sulfate dodecahydrate due to its higher thermal conductivity. The HOETSHS had good heat storage and release capacity, which can make a useful reference for the utilization of latent heat storage in off-peak power.

Key words: phase change heat storage material, household type, heating system, off-peak electricity utilization, numerical simulation

摘要：

提出基于相变材料（PCM）的分户式低谷电蓄热供暖系统，通过数值模拟及实验研究对其蓄放热特性和供暖性能做出全面评价。采用Fluent对相变蓄热供暖系统的蓄放热过程进行了数值模拟，分析了不同入口风速、不同入口风温和不同种类蓄热材料等因素对蓄热供暖系统放热性能的影响，通过实验研究验证了模拟工况的正确性。结果表明，入口风速对系统放热性能的影响较大，随着入口风速的提高，系统平均出风温度降低，瞬时供暖负荷增大；入口风温对系统放热性能的影响微弱；复合相变材料（CPCM）由于具有更高的热导率，比纯十二水硫酸铝铵更加适合作为相变蓄热供暖系统的蓄热介质。本文设计和研究的分户式低谷电相变蓄热供暖系统具有良好的蓄放热能力，可为相变蓄热在低谷电利用场景作出有益参考。

关键词: 相变蓄热材料, 分户式, 供暖系统, 低谷电利用, 数值模拟

CLC Number:

TK02

YIN Shaowu, LI Xianxian, HAN Jiawei, LU Ming, TONG Lige, WANG Li. Heat charge and release characteristics of household off-peak electricity thermal storage heating system[J]. Chemical Industry and Engineering Progress, 2024, 43(3): 1206-1213.

尹少武, 李纤纤, 韩嘉维, 路明, 童莉葛, 王立. 分户式低谷电蓄热供暖系统的蓄放热特性[J]. 化工进展, 2024, 43(3): 1206-1213.

Figures/Tables 15

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