The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation

Serageldin, Ahmed A.; Radwan, Ali; Sakata, Yoshitaka; Katsura, Takao; Nagano, Katsunori

doi:10.3390/en13061418

Cited by 21 publications

(7 citation statements)

References 37 publications

(40 reference statements)

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“…Indicatively, the effect of groundwater flow on the thermal performance of a BHE for GSHP systems was studied in the form of small-scale experiments and numerical simulations [135]. The authors concluded that it was advantageous to use a U-tube BHE with an oval cross-section in regions of potentially fast groundwater flow.…”

Section: The Effect Of Groundwater Flowmentioning

confidence: 99%

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

et al. 2020

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Shallow geothermal energy systems (SGES) may take different forms and have recently taken considerable attention due to energy geo-structures (EGS) resulting from the integration of heat exchange elements in geotechnical structures. Still, there is a lack of systematic design guidelines of SGES. Hence, in order to contribute towards that direction, the current study aims at reviewing the available SGES modeling options along with their various aspects and practices. This is done by first presenting the main analytical and numerical models and methods related to the thermal behavior of SGES. Then, the most important supplementary factors affecting such modeling are discussed. These include: (i) the boundary conditions, in the form of temperature variation or heat flow, that majorly affect the predicted thermal behavior of SGES; (ii) the spatial dimensions that may be crucial when relaxing the infinite length assumption for short heat exchangers such as energy piles (EP); (iii) the determination of SGES parameters that may need employing specific techniques to overcome practical difficulties; (iv) a short-term vs. long-term analysis depending on the thermal storage characteristics of GHE of different sizes; (v) the influence of groundwater that can have a moderating effect on fluid temperatures in both heating and cooling modes. Subsequently, thermo-mechanical interactions modeling issues are addressed that may be crucial in EGS that exhibit a dual functioning of heat exchangers and structural elements. Finally, a quite lengthy overview of the main software tools related to thermal and thermo-hydro-mechanical analysis of SGES that may be useful for practical applications is given. A unified software package incorporating all related features of all SGES may be a future aim.

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Section: The Effect Of Groundwater Flowmentioning

confidence: 99%

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

et al. 2020

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“…Ma et al investigated the effect of groundwater migration on the BHE, heat exchange between ground heat exchangers and changes in the surrounding soil from heat conduction to the coupled mode of conduction and convection [59]. The presence of groundwater advection can significantly increase heat transfer and accelerate the possibility of soil restoration, as studied by Serageldin et al [60]. Lei et al investigated whether groundwater flow and the interaction of underground pipe groups will affect heat transfer efficiency and ground temperature field distribution, thus affecting the design and operation of ground source heat pumps [58].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Piotrowska-Woroniak

2021

Energies

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On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal energy absorbed from the ground by individual BHEs, the operating temperatures obtained at the inlet and outlet of the exchanger, the annual brine flow rate, and the average operating power of the tested wells in two heating seasons were compared and analyzed. Both in 2018 and 2019, none of the examined exchangers achieved an average unit capacity of a well. The aim of the work is to verify the specific ground thermal efficiency indicators adopted for the design of the lower heat source, determined using the computational method and the TRT test with data obtained on the basis of experimental tests. The differences between the results of the tests of the operating parameters of the analyzed BHEs were shown. The data obtained in real conditions is valuable in the research and development of the BHE system.

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“…Bae et al [64] evaluated the thermal performance of different types of BHE pipes using the Thermal Response Test (TRT) under the same field and test conditions and found that the average thermal resistance of the well could be an important factor in TRT, but the effect of the increased thermal conductivity of the pipe material itself was not significant. Another important point is that the presence of groundwater advection can greatly increase heat transfer and speed up the possibility of ground restoration, as studied by Serageldin et al [65], Lei et al [2], Park et al [66], and Sakata et al [67].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)

Piotrowska-Woroniak

2021

Energies

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Based on the experimental studies, the process of ground regeneration around the borehole loaded with brine-water heat pumps working exclusively for heating purposes in the period of four consecutive heating seasons in a cold climate was presented. The research was conducted in north-eastern Poland. The aim of the work is to verify the phenomenon of thermal ground regeneration in the period between heating seasons on the basis of the recorded data and to check whether the ground is able to regenerate itself and at what rate. It was noticed that the ground does not fully regenerate, especially during heating seasons with lower temperatures. In the analyzed period, from 22 September 2016 to 12 October 2020, the ground probably cooled irreversibly by 1.5 °C. In order to illustrate and evaluate the speed of changes in the ground, the one’s profile with an undisturbed temperature field was presented for each month of the year. The presented results can be a very important source of information for the analysis of geothermal conditions occurring in the ground. They can be used to verify mathematical models and conduct long-term simulations that allow us to see the complexity of the processes taking place in the ground.

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The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation

Cited by 21 publications

References 37 publications

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)

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