Underground buildings are one of the most effective old and modern techniques, at the same time to meet the trade-off between thermal comfort and low energy consumption in hot and arid climates, through the soil thermal properties, which can be applied as a heat capacitor for moderating indoor temperatures. This research aims to improve the thermal comfort and energy efficiency of underground buildings compared to aboveground buildings in hot and arid climates based on yearly energy consumption. The experimental measurements of soil temperatures at different depths were compared to the numerical results of the Kasuda equation. Furthermore, TRNSYS software simulation findings were validated by monitoring the temperature of an underground room in Ouargla, Algeria, using digital temperature sensors. The findings revealed that an underground structure with a depth of 2.34 m decreases cooling energy demand considerably during the summer season. Furthermore, with and without state support, the investment return time was predicted from 6.5 to 3.25 years, respectively.

地下建筑是最有效的古老和现代技术之一，同时通过土壤热特性满足炎热干旱气候下热舒适性和低能耗之间的权衡，可用作蓄热器用于调节室内温度。本研究旨在根据年能源消耗量，在炎热和干旱气候下，与地上建筑相比，提高地下建筑的热舒适性和能源效率。将不同深度土壤温度的实验测量值与 Kasuda 方程的数值结果进行了比较。此外，通过使用数字温度传感器监测阿尔及利亚瓦尔格拉地下房间的温度，对 TRNSYS 软件模拟结果进行了验证。研究结果表明，深度为 2.34 m 的地下结构在夏季显着降低了冷却能源需求。此外，无论有无国家支持，投资回报时间预计分别为 6.5 至 3.25 年。