The heat transfer phenomena of supercritical CO_2 porous flow based on the Darcy model

D. T. Lin, J. Hsieh, C. Wei
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Abstract

The purpose of this study is to obtain the heat transfer phenomena of the supercritical CO_2 in the porous medium. In this study, the transient heat transfer model conjugated with the model of Darcy's law employed by the finite element package is used to obtain the dynamic and thermal behavior in the porous medium. The validated results for the heat extraction are obtained from the comparison between the simulated results and previous study. The sensitivity parameter study under the various inlet velocities and porosities of the porous medium are discussed. The results show that the inlet velocity is the most important effect for the heat extraction. In addition, it proves that the operating conditions are important in the supercritical flow for the different tendency of the temperature difference and heat extraction. The reason is that the specific heat of the CO_2 supercritical characteristics. The heat extraction will increase as the velocity increases and the porosity decreases. The supercritical porous flow will apply on the enhanced geothermal system and high efficient waste heat recycle system.
基于达西模型的超临界CO_2多孔流动传热现象
本研究的目的是获得超临界CO_2在多孔介质中的传热现象。在本研究中,采用有限元包中结合达西定律模型的瞬态传热模型来获得多孔介质的动力和热行为。将模拟结果与前人的研究结果进行了比较,得到了热提取的验证结果。讨论了不同入口速度和多孔介质孔隙率下的敏感性参数研究。结果表明,进口速度是影响抽热的最重要因素。此外,还证明了在超临界流动中,操作条件对温差和抽热趋势的不同具有重要意义。其原因是CO_2的比热具有超临界特性。随着速度的增大和孔隙率的减小,抽热量增大。超临界多孔流将应用于增强型地热系统和高效余热回收系统。
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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