Evaluation of the heat transfer and energy efficiency of a solar phase change heat storage system with a novel heat transfer structure

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management Pub Date : 2025-05-29 DOI:10.1016/j.enconman.2025.120000

Yan Yan , Zepeng Liu , Liping Zeng , Wenjing Li , Hao Yang , Hongwei Gao

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Abstract

To address the intermittent and unstable characteristics of solar energy, the combination of a solar energy system and a phase change latent heat storage unit is a promising solution. In this study, a new sandwich spiral structure is designed for a solar phase change heat storage system for residential applications. First, the influence of this structure on the internal temperature field of the latent heat storage unit is studied. Second, the effects of different radiation areas and different weather factors on the solar phase change heat storage system are compared. Finally, thermodynamic analysis of the system is carried out. The experimental findings show that the melting rate of the sandwich spiral structure is 45% of that of the double spiral structure of the same size and that the melting rate is uniform without obvious melting slow phase transition region. The solar radiation area is larger, the heat storage in the constant-temperature water tank is greater, and the temperature rise is faster. Among the influences of weather factors (solar irradiance, temperature and relative humidity) on the system, when the solar radiation intensity and temperature are stable, the relative humidity influences the solar phase change heat storage system. The overall performance of the system is evaluated. The energy efficiency of the system is 38.5%, and the exergy efficiency is 8.3%. The evaluation of the thermal performance of solar phase change heat storage systems is valuable and can provide theoretical guidance and a design basis for solar water heaters in residential applications.

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一种新型传热结构的太阳能相变蓄热系统的传热与能效评价

为了解决太阳能的间歇性和不稳定特性，将太阳能系统与相变潜热储热装置相结合是一种很有前途的解决方案。在这项研究中，设计了一种新的夹层螺旋结构，用于住宅太阳能相变储热系统。首先，研究了这种结构对潜热蓄热装置内部温度场的影响。其次，比较了不同辐射面积和不同天气因素对太阳能相变蓄热系统的影响。最后，对系统进行了热力学分析。实验结果表明，夹层螺旋结构的熔化速度是相同尺寸的双螺旋结构的45%，并且熔化速度均匀，没有明显的熔化慢相变区。太阳辐射面积越大，恒温水箱内蓄热量越大，温升速度越快。在天气因素（太阳辐照度、温度和相对湿度）对系统的影响中，当太阳辐射强度和温度稳定时，相对湿度影响太阳能相变蓄热系统。对系统的整体性能进行评估。系统的能源效率为38.5%，火用效率为8.3%。对太阳能相变蓄热系统的热性能进行评价，对太阳能热水器在住宅中的应用具有一定的理论指导和设计依据。

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来源期刊

Energy Conversion and Management 工程技术-力学

CiteScore

19.00

自引率

11.50%

发文量

1304

审稿时长

17 days

期刊介绍： The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.