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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Spectral framework for geothermal borehole heat exchangers
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Spectral framework for geothermal borehole heat exchangers

机译：地热钻孔换热器的光谱框架

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摘要

Purpose - This paper aims to present a framework for deriving analytical and semi-numericalrnmodels for coupled conductive-convective heat transfer processes in a borehole heat exchangerrnsubjected to general initial and boundary conditions.rnDesign/methodology/approach - The discrete Fourier transform and the spectral element methodrnhave been utilized for deriving two spectral models for a single U-tube borehole heat exchanger inrncontact with a soil mass.rnFindings - Verification and numerical examples have shown that the developed models are accuraternand computationally very efficient. It is illustrated that one spectral element is capable of producingrnresults which are more accurate than those produced by 200 finite elements.rnPractical implications - The gained computational efficiency and accuracy will boostrnconsiderably the possibilities for more insight into geothermal analysis, which will improve thernprocedure for designing competitive energy extraction systems.rnOriginality/value - The models are capable of calculating exactly the temperature distribution inrnall involved borehole heat exchanger components and their thermal interactions.
机译：目的-本文旨在提供一个框架，用于推导受一般初始和边界条件影响的换热器耦合传导-对流换热过程的解析模型和半数值模型。设计/方法/方法-离散傅里叶变换和光谱元素方法已被用于推导与土壤团块不接触的单个U型管井筒换热器的两个光谱模型。研究结果-验证和数值实例表明，所开发的模型准确且计算效率高。说明了一个光谱元素能够产生比200个有限元素产生的结果更精确的结果。实用意义-获得的计算效率和准确性将极大地提高对地热分析的深入了解的可能性，这将改善设计竞争性设计的过程原始值/值-该模型能够精确计算井下热交换器组件及其热相互作用中的温度分布。

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