Cheng, Nan, Zhou, Chaohui, Luo, Yongqiang, Shen, Junhao, Tian, Zhiyong, Sun, Deyu, Fan, Jianhua, Zhang, Ling, Deng, Jie ORCID: https://orcid.org/0000-0001-6896-8622 and Rosen, Marc A. (2023) Thermal behavior and performance of shallow-deep-mixed borehole heat exchanger array for sustainable building cooling and heating. Energy and Buildings, 291. p. 113108. ISSN 0378-7788

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Abstract

Geothermal energy system is a renewable, sustainable and clean source for building heating and cooling, which is important for reducing both building energy use and carbon emissions. Currently, both shallow borehole heat exchangers (SBHEs) and deep borehole heat exchangers (DBHEs) are popular in applications. However, SBHEs and DBHEs have inherit limitations when used alone. SBHEs suffer from lower heating/cooling capacities and ground imbalance problems in long run, while DBHEs are mainly used for building heating. In this study, combining both SBHEs and DBHEs is proposed as a shallow-deep-mixed borehole heat exchanger (SD-BHE) array, and more importantly a new scheme is proposed that the DBHE tube could be switched to SBHE tube in summer. SD-BHE is a new design, focusing on the combination of DBHE and shallow tube group. Its heat transfer model is established on the basis of single tube heat transfer model and tube group heat transfer model. In the analysis, the heat extraction capacity per linear meter of DBHE and SBHE is compared and analyzed for various parameters. It is found that when the cooling load of a building is greater than the heating load, the shallow-deep-mixed borehole heat exchanger (SD-BHE) array has less influence on ground temperature and provides better stability of the outlet water temperature than the SBHE array. The present study can offer a new paradigm for geothermal energy-based building cooling/heating.

Item Type:	Article
Identifier:	10.1016/j.enbuild.2023.113108
Keywords:	Geothermal energy, Ground source heat pump, Deep borehole heat exchanger, Shallow borehole heat exchanger, Analytical modeling
Subjects:	Construction and engineering > Civil and environmental engineering
Related URLs:	Publisher
Depositing User:	Jie Deng
Date Deposited:	05 May 2023 12:40
Last Modified:	06 Feb 2024 16:15
URI:	https://repository.uwl.ac.uk/id/eprint/9957

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