Progress and challenges of helical-shaped geothermal heat exchangers

Rashidi, Saman; Bakhshi, Naser; Rafee, Roohollah

doi:10.1007/s11356-021-13766-0

Cited by 12 publications

(3 citation statements)

References 102 publications

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“…Various techniques have been used, containing the utilization of porous materials (Izadi et al 2019 , Peng et al 2021 ), microchannel heat sinks (Izadi et al 2013a , Mehryan et al 2020b , Lanjwani et al 2021 ), inserts (such as twisted strips, coils, swirling flow devices, and turbulators) (Zaboli et al 2019 , Shehzad et al 2021a , Ajarostaghi et al 2022 , Noorbakhsh et al 2022 , Izadi et al 2023b ), and rough surfaces. For example, wavy surfaces (He et al 2022 ), elongated surfaces (such as fins) (Goel and Singh 2021 , Shehzad et al 2021b ), depressions and ridges (Cao et al 2021a ), change material (Shehzad et al 2021a , Izadi et al 2022a , Xiong et al 2022 ), nanofluids (Izadi et al 2013b , Valipour et al 2017 , Mohammadpour et al 2022 ), spiral tubes (Xu et al 2022 ), and helical tubes (Rashidi et al 2021 ). Some passive methods focused on improving the rate of heat exchange are further discussed in the following.…”

Section: Methods Of Improving Heat Transfer In Fpscsmentioning

confidence: 99%

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Zaboli,

Saedodin,

Ajarostaghi

et al. 2023

Environ Sci Pollut Res

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This paper reviews the impacts of employing inserts, nanofluids, and their combinations on the thermal performance of flat plate solar collectors. The present work outlines the new studies on this specific kind of solar collector. In particular, the influential factors upon operation of flat plate solar collectors with nanofluids are investigated. These include the type of nanoparticle, kind of base fluid, volume fraction of nanoparticles, and thermal efficiency. According to the reports, most of the employed nanofluids in the flat plate solar collectors include Al2O3, CuO, and TiO2. Moreover, 62.34%, 16.88%, and 11.26% of the utilized nanofluids have volume fractions between 0 and 0.5%, 0.5 and 1%, and 1 and 2%, respectively. The twisted tape is the most widely employed of various inserts, with a share of about one-third. Furthermore, the highest achieved flat plate solar collectors’ thermal efficiency with turbulator is about 86.5%. The review is closed with a discussion about the recent analyses on the simultaneous use of nanofluids and various inserts in flat plate solar collectors. According to the review of works containing nanofluid and turbulator, it has been determined that the maximum efficiency of about 84.85% can be obtained from a flat plate solar collector. It has also been observed that very few works have been done on the combination of two methods of employing nanofluid and turbulator in the flat plate solar collector, and more detailed work can still be done, using more diverse nanofluids (both single and hybrid types) and turbulators with more efficient geometries.

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Section: Methods Of Improving Heat Transfer In Fpscsmentioning

confidence: 99%

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Zaboli,

Saedodin,

Ajarostaghi

et al. 2023

Environ Sci Pollut Res

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“…A wide application in several thermal engineering fields, including chemical processing, oil and gas industries, and waste heat recovery applications is notable for HTHE. Moreover, in the cooling application in power generation and geothermal usage [ 49 ], its necessity is increasing day by day. Although there are excellent opportunities for better heat transfer with this kind of heat exchanger, they are constrained by increased pressure drop.…”

Section: Description Of the Problemmentioning

confidence: 99%

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

Fahad,

Hasan,

Ifraj

et al. 2024

Heliyon

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“…Helix-buried pipes heat exchanger is very popular for their advantages of small footprint, simple installation, and high concentration of heat exchanger pipes, and extensive research has been carried out in the technical evaluation and optimization of its heat transfer performance [24], but the heat storage carriers are mostly soils and sandy soils, and there are fewer researches on the performance of helix heat exchanger with mine backfiller as the heat storage medium. Therefore, this paper constructs four arrangement forms of helix and traditional U-type filled body buried pipes heat exchangers and numerically simulates their heat storage/release performance using COMSOL simulation software to provide a theoretical basis for the optimal design of inter-seasonal heat storage and energy storage system based on the backfilling mine.…”

Section: Introductionmentioning

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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Progress and challenges of helical-shaped geothermal heat exchangers

Cited by 12 publications

References 102 publications

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Numerical investigation on the impact of different design arrangements of helical heat exchangers with varying cross-sections utilizing ternary hybrid nanofluids

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

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