Earth-air heat exchangers (EAHE) represent a sustainable way to explore the soil to heat or cool buildings. Due to the Earth's thermal inertia, its superficial layers can be used as a heat source or sink, respectively, in the winter or summer. Hence, the EAHE employ buried ducts where the air is forced to flow and exchange heat with the soil. Such devices demand little energy, as they can use low powered fans or passive techniques for natural convection. Recurrent issues in the literature of EAHE explore how to improve their performances by analyzing their operational parameters; soil, climate, and global economic prospects; the development and validation of complete or simplified simulation models. This paper presents parameter analysis of EAHE to increase their thermal potentials (which is also related to the efficiency and the prospects for thermal comfort) and the heat exchanges (linked with the economy) considering a Brazilian city in a subtropical climate. The research uses simulations based on a validated 1D model. It is compared with three others, including 3D ones, giving more accurate results. Unlike most works covering 1D models, the methodology proposed here allows the study of multi-layered soils. After assessing the soil temperature variations, the results point out that most of the local thermal potential is attainable at relatively low depths, with magnitude peaks of 5°C. The parameter analyses are focused on this target potential, addressing changes in the airspeed, length, and diameter of the ducts. For all cases, the goal was achieved, allowing to obtain annual efficiencies close to 90%. However, only the tests increasing the length also increased the quantity of heat exchanged (in about 20%) and, consequently, proved to be economically affordable.

地球空气热交换器（EAHE）代表了一种探索土壤以加热或冷却建筑物的可持续方式。由于地球的热惯性，其表层可以在冬季或夏季分别用作热源或热沉。因此，EAHE采用埋入式管道，迫使空气流动并与土壤进行热交换。这样的设备几乎不需要能量，因为它们可以使用低功率风扇或被动技术进行自然对流。EAHE文献中反复出现的问题探讨了如何通过分析其运行参数来改善其性能。土壤，气候和全球经济前景；完整或简化的仿真模型的开发和验证。本文介绍了EAHE的参数分析，以考虑亚热带气候下的巴西城市来提高其热潜能（这也与效率和热舒适性前景有关）和热交换（与经济相关）。该研究使用基于经过验证的一维模型的仿真。将其与包括3D图形在内的其他三个图形进行比较，可以得出更准确的结果。与大多数涉及一维模型的工作不同，这里提出的方法可以研究多层土壤。在评估了土壤温度变化之后，结果指出，大多数局部热势在相对较低的深度处即可达到，其峰值为5°C。参数分析集中在此目标电位上，解决了空速，管道长度和直径的变化。对于所有情况，该目标得以实现，每年可获得接近90％的效率。然而，只有增加长度的测试也增加了热交换的量（大约20％），因此，被证明在经济上是可以承受的。