Abstract Earth to air heat exchangers are preconditioning systems designed to preheat the new air of buildings in winter. This paper suggests a study of a new horizontal coaxial earth /water/air heat exchanger (EWAHE) where hot water flows in the centre of the exchanger. After an analytical study of the exchanger in steady state regime, its coupling with the surrounding earth modeled in transient regime by spatio-temporal discretization; we obtain a very good correlation of our model under MATLAB with an equivalent three-dimensional CFD model. A parametric study, shows the influence of the ratio of inner diameter/ outer diameter, thermal conductivity of the inner tube and air flow rate/ water flow rate ratio on the energy efficiency of the system. Lastly, a case study of heating a building under Trnsys in south-eastern Algerian climate proves the energy benefits of this coaxial exchanger for cooling drinking water, naturally hot, in the region and to contribute effectively to preheating the air. We ultimately show the possibility of its use in cooling mode.

中文翻译：

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新型并流同轴地球-水-空气-热交换器的能量建模。案例研究：阿尔及利亚比斯克拉的房屋供暖

摘要 地气换热器是一种预调节系统，用于在冬季对建筑物的新空气进行预热。本文建议对一种新型水平同轴地球/水/空气热交换器 (EWAHE) 进行研究，其中热水在交换器的中心流动。在对稳态状态下的交换器进行分析研究后，通过时空离散化在瞬态状态下模拟其与周围地球的耦合；我们在 MATLAB 下获得了我们的模型与等效的三维 CFD 模型的非常好的相关性。参数研究显示了内径/外径比、内管导热系数和空气流量/水流量比对系统能效的影响。最后，一个在阿尔及利亚东南部气候下在 Trnsys 下加热建筑物的案例研究证明了这种同轴交换器的能源优势，用于冷却该地区自然热的饮用水，并有效地促进空气预热。我们最终展示了它在冷却模式下使用的可能性。