Abstract
Shallow geothermal heat has the characteristics of wide distribution and huge reserves. However, for northern rural buildings, the heating load in winter is much greater than the cooling load in summer, and thermal imbalance of the soil is prone to occur. This paper takes rural residences in southern Hebei as an example and designs a solar-assisted shallow geothermal energy system. Compared with the original shallow ground-source heat pump system, the indoor and outdoor temperature differences of the target building were first analyzed. Second, the changes in the soil temperature field and the differences in the supply and return water temperature were monitored. Finally, the initial investment and operating costs of the assisted system are analyzed. The results show that the average ground temperature field increases significantly in winter. Through the alternate operation of solar energy and ground-source heat pumps, heat extraction from the ground is reduced, and the imbalance cycle of heat extraction in winter and heat removal in summer is shortened. It alleviates the imbalance of the cold and heat loads for soil throughout the year. The inlet and outlet water temperature and heat exchange efficiency of the buried pipes have been significantly improved. The energy efficiency ratio of the system using the assisted system has increased from 3.40 in 2020 to 4.17, an increase of 0.77. The optimal ratio of the solar- assisted shallow geothermal energy system is a 12.80 m2 solar heat-collection area and one buried hole. The winter heating operating cost of the solar-assisted shallow geothermal energy system is 18.86 CNY/m2. It can save 37% of the annual operating costs of heating, cooling, and hot water compared to a single ground-source heat pump system and 40%–45% compared to traditional heating and cooling modes.
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Acknowledgments
Thanks for the support of the project of Shallow geothermal energy + Research and demonstration of combined utilization of solar energy (13000021GLN70RYZ3AACF). The work described in this paper was sponsored by the Natural Science Foundation of Hebei Province (E2023402072).
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Wang Xu, engineer. His main research interests include the investigation and evaluation of geothermal resources and shallow geothermal energy.
Bao Ling-Ling, doctor, professor. She graduated from Tianjin University with a Ph.D. and worked as a visiting scholar at the Hong Kong Polytechnic University. She is currently working at the School of Energy and Environmental Engineering at Hebei University of Engineering. She is mainly engaged in mid-deep geothermal utilization theory and technology, low-grade thermal energy utilization technology, heat and mass transfer theory and application.
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Wang, HM., Li, JW., Jia, WG. et al. Analysis of the operation characteristics of solar-assisted shallow geothermal energy systems in rural residential areas in southern Hebei Province. Appl. Geophys. (2024). https://doi.org/10.1007/s11770-024-1051-5
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DOI: https://doi.org/10.1007/s11770-024-1051-5