Numerical study on comprehensive performances of pipe-embedded building envelope integrated with arc-finned heat charging system

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
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Abstract

In the context of accelerating toward carbon neutrality, building envelopes are gradually regarded as multifunctional units with structural and energy attributes. To address the capacity mismatch between heat injection and thermal diffusion processes that hinder performance improvement of pipe-embedded energy walls, the arc-finned pipe-embedded energy walls (i.e., Arc-finPEWs) with directional heat-charging capacity are put forward. Subsequently, a validated mathematical model is established to explore the transient thermal behaviors of Arc-finPEWs as well as the impacts of 7 key parameters on its energy-saving potentials. Results showed that the directional heat-charging measures could improve the heat-charging capacity in specified directions, and the enhancement effect was more obvious as pipe spacing increased. Besides, the fin number (FN), shank length (SL), and fin angle (FA) were the top three influencing parameters in auxiliary-heating mode, whereas impacts of FA, FN, and arc angle (AA) ranked the top three in load-reduction mode. Furthermore, a larger FN and SL contributed to reducing total primary energy consumption and creating more robust invisible thermal barriers in auxiliary-heating mode, while left-facing fins or SL settings that are too high or too low were unfavorable in load-reduction mode. Meanwhile, the arc-fin designs with SL=0.6, FA=150° and AA=30° in auxiliary-heating mode and FA=30°, SL≤0.4 and AA≤15° in load-reduction mode are suggested. Compared to conventional energy-saving walls, the proposed arc-finned heat-charging system could reduce physical thermal insulation material usage with high embodied carbon features by over 60 %.

Abstract Image

管道嵌入式建筑围护结构与弧形翅片充热系统集成的综合性能数值研究
在加速实现碳中和的背景下,建筑围护结构逐渐被视为具有结构和能源属性的多功能单元。针对热量注入和热扩散过程之间的能力不匹配阻碍了管道嵌入式节能墙性能的提高,提出了具有定向充热能力的弧形翅片管嵌入式节能墙(即 Arc-finPEW)。随后,建立了一个经过验证的数学模型,以探讨弧翅式能源墙的瞬态热行为以及 7 个关键参数对其节能潜力的影响。结果表明,定向充热措施可提高特定方向的充热能力,且随着管间距的增大,增强效果更加明显。此外,在辅助加热模式下,翅片数(FN)、翅片柄长(SL)和翅片角(FA)是影响最大的三个参数,而在减载模式下,FA、FN 和弧角(AA)的影响排在前三位。此外,在辅助加热模式下,较大的 FN 和 SL 有助于降低总一次能耗,并形成更坚固的隐形热障,而过高或过低的左向鳍片或 SL 设置则不利于减载模式。同时,建议在辅助加热模式下采用 SL=0.6、FA=150°、AA=30° 的弧形翅片设计,在减载模式下采用 FA=30°、SL≤0.4、AA≤15° 的弧形翅片设计。与传统的节能墙相比,所提出的弧翅式充热系统可减少 60% 以上具有高体现碳特征的物理保温材料用量。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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