Investigation of the influence of groundwater seepage on the heat transfer characteristics of a ground source heat pump system with a 9-well group

Wang, Yu; Liu, Zhicheng; Yuan, Xiaolei; Niu, Xiaofeng; Liu, Jinxiang

doi:10.1007/s12273-019-0526-4

Cited by 17 publications

(3 citation statements)

References 34 publications

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“…Molson et al [3] have concluded that local temperature anomalies in the subsurface might result from the extraction or release of heat to the formation, further altering the chemical, physical, and microbiological characteristics of aquifers. Other studies have pointed out that the temperature field around the borehole heat exchanger is likely to spread to the downstream direction of groundwater, and the heat migration direction is consistent with the groundwater seepage direction [4][5][6]. It is observed that the higher the seepage velocity of groundwater is, the lower the temperature in the boreholes is, and the more difficult it is for heat to accumulate [7].…”

Section: Introductionmentioning

confidence: 94%

Numerical Study of the Thermo-Hydro-Mechanical Coupling Impacts of Shallow Geothermal Borehole Groups in Fractured Rock Mass on Geological Environment

Ran,

Peng,

Tian

et al. 2024

Energies

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Fractured rock mass is extensively distributed in Karst topography regions, and its geological environment is different from that of the quaternary strata. In this study, the influences on geological environment induced by the construction and operation of a large-scale borehole group of ground source heat pumps are analyzed by a thermo-hydro-mechanical (THM) coupling numerical model. It was found that groundwater is redirected as the boreholes can function as channels to the surface, and the flow velocity in the upstream of borehole group is higher than those downstream. This change in groundwater flow enhances heat transfer in the upstream boreholes but may disturb the original groundwater system and impact the local geological environment. Heat accumulation is more likely to occur downstream. The geo-stress concentration appears in the borehole area, mainly due to exaction and increasing with the depth. On the fracture plane, tensile stress and maximum shear stress simultaneously occur on the upstream of boreholes, inducing the possibility of fracturing or the expansion of existing fractures. There is a slight uplift displacement on the surface after the construction of boreholes. The correlations of the above THM phenomena are discussed and analyzed. From the modeling results, it is suggested that the consolidation of backfills can minimize the environmental disturbances in terms of groundwater redirection, thermal accumulation, occurrence of tensile stress, and possible fracturing. This study provides support for the assessment of impacts on geological environments resulting from shallow geothermal development and layout optimization of ground heat exchangers in engineering practices.

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Section: Introductionmentioning

confidence: 94%

Numerical Study of the Thermo-Hydro-Mechanical Coupling Impacts of Shallow Geothermal Borehole Groups in Fractured Rock Mass on Geological Environment

Ran,

Peng,

Tian

et al. 2024

Energies

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“…The two kinds of influence changes are more obvious with the decrease of the depth, which is because with the increase of the water volume of the recharge well, the area affected by the rising water level is also increased. Furthermore, a part of groundwater in the recharge well flows back to the pumping well through the action of convection and dispersion [22][23], which can supplement and balance the water of the pumping well and reduce the influence of the pumping well on the regional groundwater. Fig.…”

Section: Impact Analysis Of Pumping and Rechargingmentioning

confidence: 99%

Influence of different pumping and recharging schemes on regional groundwater drawdown in groundwater heat pump project: A case in Anhui Fuyang People’s Hospital

Yang

Wang

et al. 2021

THERM SCI

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In the process of exploiting geothermal energy by groundwater heat pump (GWHP), the dynamic equilibrium of regional groundwater drawdown is the basis for sustained operation of GWHP. In this paper, taking the GWHP project of Fuyang People's Hospital in Anhui, China as an example, a mathematical model is established and numerical simulation is carried out based on the hydrogeological conceptual model by using Modflow software. In addition, considering the pattern of same direction recharge, the intersect recharge and the ratio of 90% and 100% reinjection respectively, the area change of the drawdown funnel caused by the GWHP project and the recovery of the water level after the system stopped operation are analyzed. The results show that the funnel area of the pumping well under the 90% recharge ratio is greater than that of the 100% recharge, while the operation result of recharge well is opposite in the most adverse situation of the system with a production volume of 1440m3/d and continuous operation for 4 months. Furthermore, with the same reinjection ratio, the funnel area of the same direction recharge mode is larger than that of the intersect recharge mode in both pumping wells and recharge wells, and increases with the decrease of drawdown. Moreover, with the increase of recharge amount, while the water level of recharge well rises, there is a certain supplement and balance to the water quantity of the pumping well.

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“…Many researchers have studied the system optimization of HVAC units, which includes air-conditioning equipment optimization [14], fault diagnosis [15], system operation optimization [13], etc. In addition, an alternative, high-efficiency HVAC system is also attractive to researchers, and would include heat pump systems driven by different sources (e.g., air sources [16], water sources [17], ground sources [18] and dual sources [19]), a cogeneration system [20], an adsorption chiller [21], an absorption chiller [22], evaporative cooling units [23] etc.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Short and Long-Term Energy Performance and Decarbonization Potentials between Cogeneration and GSHP Systems under MARKAL Scenarios

et al. 2023

Self Cite

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In response to the call for global carbon peaking and neutrality, this study mainly focuses on the comparison of energy-related carbon emissions and the performance of two promising heating, ventilation, and air-conditioning technologies (a ground source heat pump (GSHP) and cogeneration systems) over both short (2021–2030) and long (2031–2050) periods, considering the UK decarbonization plans. The simulation model of the building with the GSHP system is validated by the actual building heating energy data in 2020 and 2021, with yearly deviations of only 0.4–0.5%. The results show that the cogeneration system performed better than the GSHP system in a scenario when there was no electricity decarbonization plan in the future. However, under all of the MARKet ALlocation (MARKAL) scenarios, the GSHP system performed much better than the cogeneration system in terms of carbon reduction in both periods, which can achieve 47.8–84.4% and maximum 97.5% carbon emission savings in short and long-term periods, respectively, compared with the cogeneration system. Due to the truth that electricity decarbonization plans will be optimized and executed in the future, the GSHP system is more promising and recommended compared with cogeneration system in both short- and long-term periods in terms of only decarbonization potentials (e.g., reducing carbon emission and achieving carbon-related environmental protection).

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Investigation of the influence of groundwater seepage on the heat transfer characteristics of a ground source heat pump system with a 9-well group

Cited by 17 publications

References 34 publications

Numerical Study of the Thermo-Hydro-Mechanical Coupling Impacts of Shallow Geothermal Borehole Groups in Fractured Rock Mass on Geological Environment

Numerical Study of the Thermo-Hydro-Mechanical Coupling Impacts of Shallow Geothermal Borehole Groups in Fractured Rock Mass on Geological Environment

Influence of different pumping and recharging schemes on regional groundwater drawdown in groundwater heat pump project: A case in Anhui Fuyang People’s Hospital

Comparison of Short and Long-Term Energy Performance and Decarbonization Potentials between Cogeneration and GSHP Systems under MARKAL Scenarios

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