Thermal and flow characteristics in a vertical spiral-type ground heat exchanger based on linear non-equilibrium thermodynamic principle

Liang, Bin; Chen, Meiqian; Fu, Bi An; Guan, Junli

doi:10.1016/j.enbuild.2022.112111

Cited by 9 publications

(4 citation statements)

References 88 publications

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“…BTES is a method of storing heat energy in the soil using buried U-shaped tubes made of polyethylene plastic (PE tube) (Liang, 2022). The tubes, containing a flow medium such as water, air, CO 2 , microencapsulated phase change material suspension, or nano fluid, are connected to the surrounding soil.…”

Section: Borehole Thermal Energy Storage (Btes)mentioning

confidence: 99%

Development status and prospect of underground thermal energy storage technology

Zhang,

Liu,

Bian

et al. 2024

Journal of Groundwater Science and Engineering

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Underground Thermal Energy Storage (UTES) store unstable and non-continuous energy underground, releasing stable heat energy on demand. This effectively improve energy utilization and optimize energy allocation. As UTES technology advances, accommodating greater depth, higher temperature and multi-energy complementarity, new research challenges emerge. This paper comprehensively provides a systematic summary of the current research status of UTES. It categorized different types of UTES systems, analyzes the applicability of key technologies of UTES, and evaluate their economic and environmental benefits. Moreover, this paper identifies existing issues with UTES, such as injection blockage, wellbore scaling and corrosion, seepage and heat transfer in cracks, etc. It suggests deepening the research on blockage formation mechanism and plugging prevention technology, improving the study of anticorrosive materials and water treatment technology, and enhancing the investigation of reservoir fracture network characterization technology and seepage heat transfer. These recommendations serve as valuable references for promoting the high-quality development of UTES.

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Section: Borehole Thermal Energy Storage (Btes)mentioning

confidence: 99%

Development status and prospect of underground thermal energy storage technology

Zhang,

Liu,

Bian

et al. 2024

Journal of Groundwater Science and Engineering

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“…parameters keep the same heat exchange internal surface area of the buried pipe. The inner diameter of the buried pipes, the pitch diameter, and the pitch length of the helix buried pipes are selected with reference to the relevant literature and combined with the actual size of the backfilling body [26][27][28] and the geometrical parameters of the BFHEs with different forms of pipe arrangement and the related material thermo-physical parameters are shown in Tables 1 and 2, respectively. The heat exchange surface area of buried pipe is the key factor in determining the heat exchange capacity of BFHEs; in order to ensure the fairness of the comparative analysis, the studied BFHEs with different buried pipe arrangement forms and structural parameters keep the same heat exchange internal surface area of the buried pipe.…”

Section: Physical Modelmentioning

confidence: 99%

“…The heat exchange surface area of buried pipe is the key factor in determining the heat exchange capacity of BFHEs; in order to ensure the fairness of the comparative analysis, the studied BFHEs with different buried pipe arrangement forms and structural parameters keep the same heat exchange internal surface area of the buried pipe. The inner diameter of the buried pipes, the pitch diameter, and the pitch length of the helix buried pipes are selected with reference to the relevant literature and combined with the actual size of the backfilling body [26][27][28] and the geometrical parameters of the BFHEs with different forms of pipe arrangement and the related material thermo-physical parameters are shown in Tables 1 and 2, respectively.…”

Section: Physical Modelmentioning

confidence: 99%

Numerical Investigation on the Performance of Horizontal Helical-Coil-Type Backfill Heat Exchangers with Different Configurations in Mine Stopes

Zhang,

Shi,

Zhang

et al. 2023

Mathematics

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The application of ground heat exchanger technology in backfill mines can actualize subterranean heat storage, which is one of the most effective solutions for addressing solar energy faults such as intermittence and fluctuation. This paper provides a 3D unsteady heat transfer numerical model for full-size horizontal backfill heat exchangers (BFHEs) with five configurations in a mining layer of a metal mine by using a COMSOL environment. In order to ensure the fairness of the comparative analysis, the pipes of BFHEs studied have the same heat exchange surface area. By comparing and evaluating the heat storage/release characteristics of BFHEs in continuous operation for three years, it was discovered that the helical pipe with serpentine layout may effectively enhance the performance of BFHEs. Compared with the traditional SS BFHEs, the heat storage capacity of the S-FH type is significantly increased by 21.7%, followed by the SA-FH type, which is increased by 11.1%, while the performances of U-DH and SH type are considerably lowered. Also, the impact of the critical structural factors (pitch length and pitch diameter) was further studied using the normalized parameters C1 and C2 based on the inner diameter of the pipe. It is discovered that BFHEs should be distributed in a pipe with a lower C1, and increasing C2 encourages BFHEs to increase the storaged/released heat of BFHEs. By comparatively analysing the effect of thermal conductivity, it is found that the positive effects of thermal conductivity on the performance of SH, U-DH, SA-FH, and S-FH type BFHEs are found to decrease successively. This work proposes a strategy for improving the heat storage and release potential of BFHEs in terms of optimal pipe arrangement.

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“…Liang et al numerically investigated the thermal and flow performances corresponding to 1-week operation of a single spiral-type surface heat exchanger. 12 Here, the coupled temperature and moisture relocation framework of backfill and soil fields are considered. Interestingly, it is observed that the spiral pitch increment or broadening the spiral radius has increased the heat transfer rate while accounting for the pressure drop by 50%-92%.…”

Section: Introductionmentioning

confidence: 99%

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Prawin

Rose

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The work presented in this article deals with the reduction of air pollution generated by automobiles. It is accomplished through the process of condensation using novel techniques such as utilization of porous metal foams. A modified geometry dump diffuser is used to facilitate flow of exhaust gases slowly around copper coils thereby condensing them. The condensed gases can be collected and stored in a chamber and then can be carried to industries for recycling. This article involves design of the modified geometry dump diffuser using CATIA V5 tool. The computational fluid dynamics (CFD) analysis of the model is carried out using the ANSYS Fluent software. The inlet parameters are obtained as per the exhaust characteristics of a typical 0.8 l 3-cylinder Gasoline Engine. The results are presented for modified geometry dump diffuser models with and without porous bed. Porous bed module is used to simulate the presence of metal foams in the primary zone and inside the inner fluid zone. The results are presented. The results show that the modified geometry dump diffuser model with porous bed can cool the exhaust gases to their condensation temperature. This model can be employed in automobiles to reduce air pollution.

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Thermal and flow characteristics in a vertical spiral-type ground heat exchanger based on linear non-equilibrium thermodynamic principle

Cited by 9 publications

References 88 publications

Development status and prospect of underground thermal energy storage technology

Development status and prospect of underground thermal energy storage technology

Numerical Investigation on the Performance of Horizontal Helical-Coil-Type Backfill Heat Exchangers with Different Configurations in Mine Stopes

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

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