Thermal Performance of Earth Air Heat Exchanger for Geothermal Energy Application in Hot Climate using CFD Simulation

Faeza Mahdi Hadi, Muntadher Hashim Abed, Karrar Abed Hammoodi
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Abstract

The Ground Air Heat Exchanger (GAHE) is a sustainable, environment friendly, and efficient device that can be used for both heating and cooling applications. Careful design of GAHE enables efficient exploit of the earth interior energy. The design of a GAHE relies on the constant temperature of the earth interior which allows consistent and reliable source of geothermal energy. By harnessing this renewable energy, a sustainable solution for heating and cooling needs is attained while minimizing the impact on environment. In this study, the performance of GAHE was examined using ANSYS Fluent 19 R1 and SOLID WORK 16.0 software. The efficiency and Coefficient of Performance (COP) of the ETHE have been investigated. The effect of air flow rate and operation conditions on the outlet air temperature have been studied. GAHE is made of Polyvinyl Chloride (PVC) pipe of 0.1 m diameter, 0.005 m thickness and 18 m horizontal length. Computer simulations were carried out for five different air velocities (1, 2, 3, 4, and 5 m/s) at various operation conditions. Results show that the 18 m pipe length is adequate to attain useful air outlet temperature giving COP values between 0.5 and 1.3. The length of the horizontal part of GAHE can be further increased for air velocities between 3 and 5 m/s. Comparison between the results obtained by the CFD model and experimental work demonstrated that the CFD model is capable of producing results with acceptable accuracy. This suggests that the CFD software can accurately model the performance of the GAHE under different operation conditions. Increasing the length of the horizontal part of the GAHE can improve its COP when higher air velocities are used.
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利用 CFD 模拟在炎热气候中应用地热能源的土空气热交换器的热性能
地空气热交换器(GAHE)是一种可持续、环保、高效的设备,既可用于供暖,也可用于制冷。经过精心设计的地空气热交换器能够有效利用地球内部的能量。地热交换器的设计依赖于地球内部恒定的温度,这使得地热能的来源稳定可靠。通过利用这种可再生能源,可持续地满足供热和制冷需求,同时最大限度地减少对环境的影响。本研究使用 ANSYS Fluent 19 R1 和 SOLID WORK 16.0 软件对 GAHE 的性能进行了检验。研究了 ETHE 的效率和性能系数 (COP)。研究了空气流速和运行条件对出口空气温度的影响。GAHE 由直径 0.1 米、厚度 0.005 米、水平长度 18 米的聚氯乙烯(PVC)管制成。在不同的运行条件下,对五种不同的气流速度(1、2、3、4 和 5 米/秒)进行了计算机模拟。结果表明,18 米的管道长度足以达到有用的空气出口温度,使 COP 值介于 0.5 和 1.3 之间。当气流速度在 3 至 5 米/秒之间时,GAHE 水平部分的长度可进一步增加。将 CFD 模型得出的结果与实验结果进行比较后发现,CFD 模型能够得出准确度可接受的结果。这表明 CFD 软件能够准确模拟 GAHE 在不同运行条件下的性能。当使用较高的气速时,增加 GAHE 水平部分的长度可以提高 COP。
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
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
2.40
自引率
0.00%
发文量
176
期刊介绍: This journal welcomes high-quality original contributions on experimental, computational, and physical aspects of fluid mechanics and thermal sciences relevant to engineering or the environment, multiphase and microscale flows, microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.
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