Abstract Geothermal energy has a huge potential in building applications. This paper proposes the use of an Air-Source Heat Pump (ASHP) system coupled with a Horizontal Earth-To-Air Heat Exchanger (EAHX) to reduce energy consumption in buildings. The novelty is to geothermally pre-heat or pre-cool the air source of the ASHP through the EAHX, reducing the electric power needed, keeping constant heating/cooling capacity. The behaviour of ASHP-EAHX system has been investigated by a numerical model implemented in TRNSYS. A total of 54 combinations have been obtained and tested varying ground thermal properties, burial depth, air flow rate and pipe length. The model has been validated with a real case showing a good agreement between simulated and monitored data. The study is focused on the city of Turin (North of Italy), compared with Brindisi (South of Italy), and extremely cold and hot climates like Tromso (Norway) and Bechar (Algeria), respectively. The ASHP-EAXH performance has been investigated, by the comparison with the traditional ASHP, using different coefficients, such as the Coefficient of Performance (COP), the Energy Efficiency Ratio (EER), the Seasonal Coefficient of Performance (SCOP), and the Seasonal Energy Efficiency Ratio (SEER). The paper reveals how the ASHP-EAHX system show higher performance compared to the traditional ASHP, in all seasons. The overall merit is, for cold extremely climate, the reduction of the shutdown periods, when the outside temperature is below the limit operating temperature, and to allow the extension of the use of the heat pump to locations, where it is currently not convenient for the average outside temperature lower than the limit operating temperature of the heat pump.

中文翻译：

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空气源热泵（ASHP）与水平地对空气换热器（EAHX）耦合在不同气候条件下的能量性能数值和实验分析

摘要 地热能在建筑领域有着巨大的应用潜力。本文建议使用空气源热泵 (ASHP) 系统与水平地对空气热交换器 (EAHX) 相结合，以减少建筑物的能源消耗。新颖之处在于通过EAHX对ASHP的空气源进行地热预热或预冷，减少了所需的电力，保持恒定的加热/冷却能力。已经通过在 TRNSYS 中实现的数值模型研究了 ASHP-EAHX 系统的行为。总共获得了 54 种组合，并测试了不同的地热特性、埋藏深度、空气流速和管道长度。该模型已通过真实案例验证，显示模拟数据和监控数据之间具有良好的一致性。该研究的重点是都灵市（意大利北部），与布林迪西（意大利南部）相比，以及特罗姆瑟（挪威）和贝查尔（阿尔及利亚）等极端寒冷和炎热的气候。通过与传统ASHP的比较，研究了ASHP-EAXH的性能，使用不同的系数，如性能系数（COP）、能效比（EER）、季节性性能系数（SCOP）和季节性能效比 (SEER)。该论文揭示了ASHP-EAHX 系统如何在所有季节都显示出比传统ASHP 更高的性能。总体优点是，对于极端寒冷的气候，当室外温度低于极限运行温度时，减少了停机时间，并允许将热泵的使用扩展到位置，