Computational Modeling of an Earth-Air Heat Exchanger Integrated with Phase Change Materials: A Case Study Performed for the Viamão City, Rio Grande do Sul State, Brazil

Q4 Physics and Astronomy Defect and Diffusion Forum Pub Date : 2023-07-14 DOI:10.4028/p-n7qBvb

Giovanni Antonio Vielma Vivas, M. K. Rodrigues, L. Rocha, E. D. dos Santos, R. Brum, L. Isoldi

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Abstract

The earth-air heat exchanger (EAHE) is a sustainable option that allows the electrical energy consumption reduction in buildings. The objective of this study is to evaluate the influence of the incorporation of the thermal energy storage principle based on phase change materials (PCM) into the EAHE on its thermal potential. For this, a three-dimensional numerical model of the PCM coupled to the EAHE (EAHE-PCM) was developed based on the effective heat capacity method and adapted to the climatic conditions and soil characteristics of the Viamão city, Rio Grande do Sul State, Brazil. It was found that for a duct diameter and length of 0.11 m and 25.77 m, the incorporation of PCM to EAHE improved by 8.90% and 3.97% in the average annual thermal potential of heating and cooling, respectively. In addition, the average monthly thermal potential increased 19.70% (heating) and 8.48%(cooling), for the months of May and December, respectively, when the PCM was integrated into the system.

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结合相变材料的地球-空气热交换器的计算建模:以巴西南格兰德州viam市为例

地-空气换热器（EAHE）是一种可持续的选择，可以减少建筑物的电能消耗。本研究的目的是评估将基于相变材料（PCM）的热能存储原理引入EAHE对其热势的影响。为此，基于有效热容法，开发了一个PCM与EAHE耦合的三维数值模型（EAHE-PCM），该模型适用于巴西南里奥格兰德州维亚芒市的气候条件和土壤特征。研究发现，对于0.11m和25.77m的管道直径和长度，将PCM加入EAHE中，加热和冷却的年均热势分别提高了8.90%和3.97%。此外，当PCM集成到系统中时，5月和12月的平均月热潜力分别增加了19.70%（供暖）和8.48%（制冷）。

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来源期刊

Defect and Diffusion Forum Physics and Astronomy-Radiation

CiteScore

1.20

自引率

0.00%

发文量

127

期刊介绍： Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.