Experimental study of a novel integrated heating terminal with three-fluid heat exchanger and gravity heat pipe

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Energy and Buildings Pub Date : 2025-04-08 DOI:10.1016/j.enbuild.2025.115728

Junjie Chi , Yichi Zhang , Bin Luo , Xianting Li , Baolong Wang , Zixu Yang , Wenxing Shi

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Abstract

Improving indoor thermal comfort in intermittently heated rooms while reducing the energy consumption simultaneously plays an important role in building carbon neutrality. Therefore, a novel integrated terminal with three-fluid heat exchanger and gravity heat pipe, which integrated the advantages of convective and radiant units, was proposed. A prototype was developed, and experiments was designed to investigate the heating characteristics. The findings indicate that the total heat transfer capacity of integrated terminal can be adjusted from 673 to 5753 W. System performance exhibits fluctuations within the range of 2.4 to 4.4 W/W and its thermal response time is approximately 20 min. The optimal refrigerant charge for the gravity heat pipe is identified as R1233zd, which is approximately 65 %. Additionally, the gravity heat pipe surface exhibits good uniformity, with a vertical temperature difference of up to 1 °C. In all, the aforementioned experimental results verified the benefits of this terminal in terms of heat transfer, performance, thermal response and temperature uniformity.

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一种新型三流体换热器-重力热管一体化加热终端的实验研究

提高间断式供暖房间的室内热舒适性，同时降低能耗，对建筑碳中和具有重要作用。为此，提出了一种集对流单元和辐射单元优点于一体的新型三流体换热器和重力热管集成终端。研制了原型机，并设计了实验来研究其加热特性。结果表明：综合终端的总换热容量可在673 ~ 5753 W范围内调节。系统性能波动范围为2.4 ~ 4.4 W/W，热响应时间约为20 min。确定重力热管的最佳制冷剂充注量为R1233zd，充注量约为65%。此外，重力热管表面均匀性好，垂直温差可达1℃。综上所述，上述实验结果验证了该终端在传热、性能、热响应和温度均匀性方面的优势。

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来源期刊

Energy and Buildings 工程技术-工程：土木

CiteScore

12.70

自引率

11.90%

发文量

863

审稿时长

38 days

期刊介绍： An international journal devoted to investigations of energy use and efficiency in buildings Energy and Buildings is an international journal publishing articles with explicit links to energy use in buildings. The aim is to present new research results, and new proven practice aimed at reducing the energy needs of a building and improving indoor environment quality.