Thermal performance analysis of PCM-integrated structures using the resistance-capacitance model: Experiments and numerics

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-11-02 DOI:10.1016/j.tsep.2024.103019

Inzamam Ahmad , Ravinder kumar , Uddipta Ghosh , Atul Bhargav , Rachid Bennacer , Mohammed El Ganaoui

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引用次数: 0

Abstract

While holding significant potential to reduce cooling energy requirements in buildings, the incorporation of phase-change materials in building envelopes requires information regarding their diurnal and seasonal behaviour through high-fidelity simulations. However, utilizing short-term simulations and experimentation using state-of-the-art models for such a complex configuration does not accurately represent the true heat transfer dynamics of the building. To address this lacuna, we present a physics-based, low computational cost, experimentally and numerically validated resistance–capacitance (RC) model specifically tailored for PCM-encapsulated structures, designed for long-term simulations. The validation of this model is conducted through in-house experiments. Additionally, we support the credibility of our RC model by subjecting it to validation through 3D numerical simulations, emphasizing its precision and reliability. Then, we use the validated model to optimize the thermal properties of concrete roofs in hot and dry climates, taking a specific instance of a city in Western India for various geometric configurations as an illustrative example. We find that a PCM with a phase change temperature between 37 and 42 °C can reduce the peak ceiling temperature by up to 10 °C and the peak energy ingress by a factor of 2 or more, in a typical roof element subjected to the prevailing climatic conditions during peak summer. This shows the time constant of the modified roof is effective in delaying and damping the imposed solar insolation. We make specific recommendations on the selection and geometry optimization of PCM-incorporated roof elements.

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利用电阻-电容模型分析 PCM 一体化结构的热性能：实验和数值分析

虽然相变材料在降低建筑物制冷能耗方面具有巨大潜力，但在建筑物外围护结构中使用相变材料需要通过高保真模拟获得有关其昼夜和季节行为的信息。然而，对于如此复杂的配置，使用最先进的模型进行短期模拟和实验并不能准确反映建筑物的真实传热动态。针对这一缺陷，我们提出了一种基于物理学、计算成本低、经过实验和数值验证的电阻-电容（RC）模型，专门为 PCM 封装结构量身定制，用于长期模拟。该模型通过内部实验进行了验证。此外，我们还通过三维数值模拟对 RC 模型进行验证，强调其精确性和可靠性，从而为模型的可信度提供支持。然后，我们使用经过验证的模型来优化干热气候条件下混凝土屋顶的热性能，并以印度西部某城市的一个具体实例为例来说明各种几何配置。我们发现，相变温度介于 37 ℃ 和 42 ℃ 之间的 PCM 可以将顶棚的峰值温度降低 10 ℃，并将峰值能量摄入量降低 2 倍或更多。这表明改良屋顶的时间常数能有效延迟和抑制外加的太阳日照。我们对融入 PCM 的屋顶构件的选择和几何形状优化提出了具体建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.