Experimental study on cooling performance of underground pipe gallery ventilation enhanced by borehole heat exchanger

Tong Wei, Cong Shen, Haonan Jiang, Zijun Xu, Zhaolin Gu and Xilian Luo

Renewable Energy, 2025, vol. 240, issue C

Abstract: The underground pipe gallery (UPG) has the potential to provide pre-cooling for building ventilation. However, maintaining a stable air supply is challenging due to fluctuations in outdoor temperatures. To address this issue, a ventilation system that employs the UPG and the borehole heat exchanger (BHE) of a ground-source heat pump as integrated cooling sources is proposed in this study. The cooling performance and climate suitability of the newly designed system are experimentally evaluated by a full-scale setup. The results show the system has remarkable re-cooling effectiveness, maintaining room temperature below 28 °C even when outdoor temperatures exceed 40 °C. The BHE significantly cools the air from the UPG, thereby stabilizing air supply parameters. The temperature of the supplied air is consistently maintained between 18.7 °C and 20.9 °C, with a supply air flow rate ranging from 494.1 m³/h to 1982.9 m³/h. Based on the findings, the recommended ventilation rate is 494.1 m³/h, and the indoor thermal comfort satisfaction exceeds 60 % for occupants meeting the requirements (24 < T < 28 °C and 40 < RH < 70 %). The proposed system offers a viable alternative to traditional energy for building air conditioning with major technical benefits, particularly in arid regions.

Keywords: Underground pipe gallery; Borehole heat exchanger; Full-scale experiment; Shallow geothermal energy; Indoor thermal comfort (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:240:y:2025:i:c:s096014812402202x

DOI: 10.1016/j.renene.2024.122134

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