Thermal Performance of Thermosyphon for Different Working Fluids

Russo, Giovanna; Krambeck, Larissa; Nishida, Felipe Baptista; Santos, Paulo Henrique Dias Dos; Alves, Thiago Antonini

doi:10.5380/reterm.v15i1.62150

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…From the results presented in [23,24], for the designated temperature interval, the figure of merit for ethanol, acetone, and methanol ranges from 1200 kg/(K 3/4 s 5/2 ) to 2000 kg/(K 3/4 s 5/2 ); revealing no significant difference between them. This finding confirms that, despite the existence of several criteria, the selection of an optimal working fluid is not possible without an integral performance analysis.…”

Section: Working Fluid Selection and Charging Proceduresmentioning

confidence: 99%

“…The influence of the working fluid on thermosyphon performance has been thoroughly studied [20][21][22][23][24] involving a variety of substances such as FC-72, R410a, R407C, R134a, distilled water, ethanol, methanol, and acetone, among others. These studies focus on heat pipes/thermosyphon devices as waste-heat recovery or electronic cooling, and most of the authors conclude that refrigerants are most suitable for these applications.…”

Section: Working Fluid Selection and Considerationsmentioning

confidence: 99%

“…This finding confirms that, despite the existence of several criteria, the selection of an optimal working fluid is not possible without an integral performance analysis. For this evaluation, ethanol and acetone were selected as working fluids based on their lower latent heat of vaporization [24]; a property crucial to achieving a higher heat transfer rate. To compare the performance of these working fluids, distilled water was employed as a control/benchmark since it is a common fluid and suited to the designated temperature interval [27].…”

Section: Working Fluid Selection and Charging Proceduresmentioning

confidence: 99%

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Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices

et al. 2022

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An experimental study is presented to account for the implementation of a two-phase closed thermosyphon pipe, for energy-saving purposes, in air conditioning systems in the context of COVID-19. The experimental setup consisted of a 0.5 m × 0.0127 m type L copper pipe which was employed as the body of the heat exchanger; an electric resistance heater of 0.1 m length located at the bottom; and a 0.25 m length water-cooled concentric condenser located at the top. The evaluation was conducted employing acetone, ethanol, and distilled water as working fluids; ranging the heat supplied at the evaporator from 25 to 125 W and the filling ratio from 20% to 40% of the total inner volume of the thermosyphon. From the data obtained, it was found that ethanol is the working fluid most susceptible to changes in operation conditions. Contrarily, distilled water was found to deliver consistent performance, up to a point that, for the analysed setup, it is considered to be independent of both, heat flow supplied at the evaporator and thermosyphon filling ratio. Meanwhile, acetone was found to be the only fluid tested that displays a directly proportional behaviour between heat absorption and dissipation. From compiling experimental data, response surfaces were constructed and used as direct and rough optimization tools. The information provided by this approach is considered to be particularly useful and is introduced for modelling and design purposes. Based on the results, it was found that acetone, within operation ranges of 34%<ϕ<40% and 75 W<Q˙Evap<125 W, was the most suitable working fluid to use in a two-phase closed thermosyphon for energy-saving purposes in air conditioning applications.

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Section: Working Fluid Selection and Charging Proceduresmentioning

confidence: 99%

Section: Working Fluid Selection and Considerationsmentioning

confidence: 99%

Section: Working Fluid Selection and Charging Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices

et al. 2022

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“…The steps are cleaning, assembly, tightness test, evacuation procedure, and filling with the working fluid. These procedures were based on [21][22][23][24][25][26].…”

Section: Heat Pipe and Thermosyphon Manufacturingmentioning

confidence: 99%

Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

Alves¹,

Krambeck²,

dosSantos³

2018

Bringing Thermoelectricity Into Reality

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The heat pipe and thermosyphon are passive heat transfer devices with phase change, which can be applied for thermal management of thermoelectric cooling, such as the TEC hot side. The heat pipes basically consist of a metal tube sealed with capillary structure internally that is embedded with a working fluid. This capillary structure can be made of screen meshes, grooves, or sintered media. The thermosyphon is a heat pipe assisted by gravity, because it has no capillary structure. Then, in this chapter, manufacturing of low cost and easy-to-manufacture heat pipes and thermosyphon is described in detail, and an experimental evaluation of their thermal performance is accomplished. The considered devices were a rod, a thermosyphon, a mesh heat pipe, a grooved heat pipe, and a sintered heat pipe. According to the behavior of the global thermal resistance and the effective thermal conductivity, the passive devices operated satisfactorily with the exception of the rod and the thermosyphon in the horizontal position. The heat pipes were the best among the tested devices and the best position was vertical.

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“…The methodology for manufacture (cleaning, assembly, tightness test, evacuation procedure, and filling with the working fluid); test; and analysis of the heat pipe were developed based on Nishida (2016), Russo et al (2016), Krambeck et al (2017), and Santos et al (2017).…”

Section: Experiments Analysismentioning

confidence: 99%

Experimental Analysis of a Screen-Covered Groove Heat Pipe

Krambeck

Bartmeyer

Santos

et al. 2018

RETERM

Self Cite

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In this research, a heat pipe with screen-covered groove capillary structure was experimentally analyzed. The heat pipe was manufactured from a copper tube with the external diameter of 9.45mm, inner diameter of 6.20mm, and a total length of 200mm. A Wire Electrical Discharge Machining, or Wire-EDM, was used to manufacture axial microgrooves in the heat pipe. A layer of phosphor bronze mesh #100 completed the capillary structure. Distilled water was the working fluid and the loading filling ratio was 60% of the evaporator volume. The condenser was cooled by air forced convection, the adiabatic section was insulated with fiberglass, and the evaporator was heated by an electrical resistor and it was insulated from the environment with aeronautic insulation. The heat pipe was tested in horizontal position, under different heat loads varying from 5 up to 30W. The experimental results showed that the screen-covered groove worked satisfactorily as a capillary structure.

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Thermal Performance of Thermosyphon for Different Working Fluids

Cited by 5 publications

References 1 publication

Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices

Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices

Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

Experimental Analysis of a Screen-Covered Groove Heat Pipe

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