A review of experimental studies on cylindrical two-phase closed thermosyphon using refrigerant for low-temperature applications

Anand, R.S.; Jawahar, C.P.; Solomon, A. Brusly; Bellos, Evangelos

doi:10.1016/j.ijrefrig.2020.08.011

Cited by 21 publications

(7 citation statements)

References 90 publications

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“…The evaporator section is placed under the condenser section. It can effectively transport a large amount of heat energy along the tube wall with a small temperature difference between the condenser section and the evaporator section [16,17].…”

Section: Operating Principles Of the Tpctmentioning

confidence: 99%

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Du,

2024

Preprint

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Permafrost covers about 23% ~ 25% of the land in the northern hemisphere, mainly in Russia, Canada, Alaska, Northeast and Qinghai Tibet Plateau (QTP) in China. Many engineering especially the transportation has been in the permafrost regions above. Under the action of highways construction and global warming, permafrost under infrastructures is degraded and causes serious damage. Two phases closed thermosyphon (TPCT) is a widely accepted green countermeasure against the problem in permafrost regions. Although it has been applied to prevent permafrost degradation, their application presents significant challenges on account of the stronger endothermic action of asphalt pavement. This paper focused on the thermosyphon technology and application in the permafrost. Moreover, the article highlighted the excellent working performance of the TPCT that improving the stability of the infrastructures and prevent it degrading due its excellent efficiency of heat transfer. The industrial applications of the TPCT were also summarized, along with their limitations. Finally, the results reported in this paper can provide a valuable guidance for the design of the TPCT and construction of the permafrost regions in the future.

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Section: Operating Principles Of the Tpctmentioning

confidence: 99%

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Du,

2024

Preprint

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“…It enables the prediction of approximate solutions. Addressing challenges related to heat and mass transfer and fluid flow involves three main, traditionally employed approaches: analytical, experimental, and computational methods [38][39][40][41][42]. For this study, Ansys Fluent was employed for modeling and analysis, thanks to a research-licensed version generously provided by King Mongkut's University of Technology North Bangkok (KMUTNB).…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

Optimization Design of Closed-Loop Thermosyphons: Experimentation and Computational Fluid Dynamics Modeling

Ritthong,

Thongkom,

Sawisit

et al. 2024

Energies

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The well-established practice of integrating heat pipes into thermosyphons is recognized for its efficacy in achieving energy savings. This integration facilitates heat transfer and fluid circulation without requiring additional pumps or energy input, resulting in reduced consumption, lowered operational costs, and an overall improvement in system efficiency. This research explores the energy-saving potential of closed-loop thermosyphons, with a specific focus on their integration in latent heat-based heat pipe technologies in industrial settings. The study systematically investigates the influence of thermosyphon orientation on energy efficiency through a combination of experiments and computational fluid dynamics (CFD) simulations. Thereby, it results in superior heat transfer rates in forced convection scenarios. A closed-loop thermosyphon heat exchanger undergoes evaluation in three panel installation configurations relative to the ground, taking into consideration factors including copper diameters, coolants (with or without R410a), and temperature conditions. CFD validation identifies an efficient thermosyphon design—a panel oriented perpendicularly to the ground and filled with R410a refrigerant at 90 °C. It utilizes a 19.05 mm copper tube for forced convection. This optimized design demonstrates a commendable heat transfer rate of 1485 W and a heat transfer coefficient of 1252 W/(m2·K), significantly enhancing thermal process efficiency and resulting in notable energy savings.

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“…The cooling capacity becomes more or less relevant according to the effects of geometric parameters. Anand et al 43 show that the geometrical parameter has 13% of experimental investigations and the big percentage is for refrigerant and nanofluid. Han et al 44 found that the cooling capacity pf the thermosyphon increases 2.5 times with a finned condenser comparing with no finned one.…”

Section: Thermosyphon Loop Performance Improvementmentioning

confidence: 99%

Study of annual performance and capacity of data center passive cooling mode

Sbaity

Louahlia-Gualous

Masson

2021

Intl J of Energy Research

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This article studies a new architecture of a thermosyphon loop and its capacity to cool data center considering the climate of several cities in France. A parametric experimental study is carried out to show the effect of the refrigerant fill ratio, the input heat load, and the outside temperature. The optimal fill ratio is 16% and the maximum cooling capacity is 1900 W when the data center outside temperature is 20 C. A hydraulic and thermal analytical model is developed to simulate the thermosyphon loop, and it is validated with the experimental results. The cooling load of a typical data center with ten racks, each one dissipates 4.5 kW, is simulated by TRNSYS software for the eight chosen cities in France. The annual performance shows that the percentage of undissipated heat is 13.4% in Marseille that has the highest annual average outside temperature and 2.7% in Caen that has the lowest summer average outside temperature of the data center. The particularity of this work is that it gives the annual performance of a new architecture of a thermosyphon loop in several cities of France with different climates and without electricity consumption.

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A review of experimental studies on cylindrical two-phase closed thermosyphon using refrigerant for low-temperature applications

Cited by 21 publications

References 90 publications

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Optimization Design of Closed-Loop Thermosyphons: Experimentation and Computational Fluid Dynamics Modeling

Study of annual performance and capacity of data center passive cooling mode

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