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Heat Transfer Characteristics of Heat Pipes
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Heat Transfer Characteristics of Heat Pipes

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 11517

Special Issue Editor

Dr. Manabendra Saha

E-Mail Website
Guest Editor
Centre for Energy Technology, School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
Interests: CFD modelling; MILD combustion; heat transfer; thermo-fluids; renewable energy

Special Issue Information

Dear Colleagues,

Owing to technological advancements in electronic equipment and other applications such as air space crafts, air conditioning, and refrigeration systems where heat dissipation is very important, the use of heat pipes is very effective. The heat pipe is very superior in heat transport from the source to the sink. The conventional heat pipe is a closed end tube with a wick lining on its inside surface or without wick in wickless heat pipes. The heat pipe is charged with a certain amount of a working fluid. It is divided into three sections: the evaporator where heat is supplied to the device from a heat source, the adiabatic section, and a condenser where heat is dissipated to heat sink. The heat pipe operating principles are based on evaporation of working fluid where heat is carried by vapours to the condenser and rejected due to condensation. Heat pipes are devices capable of very high heat transfer and have been widely used in many thermal management applications.

While much effort is devoted to the heat transfer characteristics of heat pipes, there is a pressing need to innovate and demonstrate technologies to be implemented in this area. This Special Issue is focused on bringing together innovative developments, technologies, and solutions in the field of heat transfer characteristics of heat pipes.

Dr. Manabendra Saha
Guest Editor

Manuscript Submission Information

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Keywords

  • Heat transfer characteristics
  • Heat pipe
  • Microelectronics cooling system
  • Heat pumps
  • Electronics cooling

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Published Papers (4 papers)

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Research

38 pages, 14971 KiB  
Article
Numerical Model of Heat Pipes as an Optimization Method of Heat Exchangers
by Łukasz Adrian, Szymon Szufa, Piotr Piersa and Filip Mikołajczyk
Energies 2021, 14(22), 7647; https://doi.org/10.3390/en14227647 - 16 Nov 2021
Cited by 9 | Viewed by 2609
Abstract
This paper presents research results on heat pipe numerical models as optimization of heat pipe heat exchangers for intensification of heat exchange processes and the creation of heat exchangers with high efficiency while reducing their dimensions. This work and results will allow for [...] Read more.
This paper presents research results on heat pipe numerical models as optimization of heat pipe heat exchangers for intensification of heat exchange processes and the creation of heat exchangers with high efficiency while reducing their dimensions. This work and results will allow for the extension of their application in passive and low-energy construction. New findings will provide a broader understanding of how heat pipes work and discover their potential to intensify heat transfer processes, heat recovery and the development of low-energy building engineering. The need to conduct research and analyses on the subject of this study is conditioned by the need to save primary energy in both construction engineering and industry. The need to save primary energy and reduce emissions of carbon dioxide and other pollutants has been imposed on the EU Member States through multiple directives and regulations. The presented numerical model of the heat pipe and the results of computer simulations are identical to the experimental results for all tested heat pipe geometries, the presented working factors and their best degrees of filling. Full article
(This article belongs to the Special Issue Heat Transfer Characteristics of Heat Pipes)
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29 pages, 13924 KiB  
Article
Analysis and Evaluation of Heat Pipe Efficiency to Reduce Low Emission with the Use of Working Agents R134A, R404A and R407C, R410A
by Łukasz Adrian, Szymon Szufa, Piotr Piersa, Piotr Kuryło, Filip Mikołajczyk, Krystian Kurowski, Sławomir Pochwała, Andrzej Obraniak, Jacek Stelmach, Grzegorz Wielgosiński, Justyna Czerwińska and Przemysław Kubiak
Energies 2021, 14(7), 1926; https://doi.org/10.3390/en14071926 - 31 Mar 2021
Cited by 8 | Viewed by 3246
Abstract
This paper presents an analysis of methods to increase the efficiency of heat transfer in heat exchangers. The scope of the research included analysis of efficiency optimization using the example of two tubular heat exchanger structures most often used in industry. The obtained [...] Read more.
This paper presents an analysis of methods to increase the efficiency of heat transfer in heat exchangers. The scope of the research included analysis of efficiency optimization using the example of two tubular heat exchanger structures most often used in industry. The obtained efficiency of heat recovery from the ground of the examined exchangers was over 90%, enabling the reduction of emissions of the heating systems of buildings. The paper presents the results of tests of two types of heat pipes using R134A, R404A, and R407C working agents. The paper also presents the results of experimental tests using the R410A working medium. The results included in the study will also enable the effective use of land as a heat store. Full article
(This article belongs to the Special Issue Heat Transfer Characteristics of Heat Pipes)
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17 pages, 4235 KiB  
Article
The Power and Efficiency Analyses of the Cylindrical Cavity Receiver on the Solar Stirling Engine
by Ji-Qiang Li, Jeong-Tae Kwon and Seon-Jun Jang
Energies 2020, 13(21), 5798; https://doi.org/10.3390/en13215798 - 5 Nov 2020
Cited by 13 | Viewed by 2328
Abstract
The technique of solar dish and Stirling engine combination is the most challenging and promising one. For the efficient conversion of the externally concentrated heat to the usable power, we studied the influences of the wall temperature, inclination angle, and open area ratio [...] Read more.
The technique of solar dish and Stirling engine combination is the most challenging and promising one. For the efficient conversion of the externally concentrated heat to the usable power, we studied the influences of the wall temperature, inclination angle, and open area ratio of the receiver on the Stirling engine power and efficiency. The theoretical analysis of the heat exchange element of the solar Stirling engine was performed, and the simulation model of the cavity absorber was built and analyzed. The temperature cloud and heat loss trends of the receiver under different wall temperatures, inclination angles, and opening ratios were illustrated. When the wall temperature of the absorber changes from 700 to 1000 K, the efficiency of the engine has increased by 8.8% from 21.34% to 30.11%. The higher the temperature, the higher the efficiency. As the inclination angle of the absorber increases from 0° to 60°, the efficiency of the engine is increased by 7.7% from 21.1% to 28.8%. With the increases of the aperture ratio, the engine output and efficiency reduced. The engine efficiency at the aperture ratio of 0.5 is 4% larger than that at the aperture ratio of 1. Full article
(This article belongs to the Special Issue Heat Transfer Characteristics of Heat Pipes)
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15 pages, 35600 KiB  
Article
Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink
by Eui-Hyeok Song, Kye-Bock Lee, Seok-Ho Rhi and Kibum Kim
Energies 2020, 13(20), 5282; https://doi.org/10.3390/en13205282 - 12 Oct 2020
Cited by 9 | Viewed by 2384
Abstract
A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat [...] Read more.
A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largely increase the heat transfer area for cooling compared to conventional heat pipes. In the current AHPHS, condensation takes place along the whole annular space from the certain heating area as the evaporator section. Therefore, the whole inner space of the AHPHS except the heating area can be considered the condenser. In the present study, AHPHSs of different diameters were fabricated and studied experimentally. Basic studies were carried out with a 50 mm-long stainless steel AHPHS with diameter ratios of 1.1 and 1.3 and the same inner tube diameter of 76 mm. Several experimental parameters such as volume fractions of 10–70%, different air flow velocity, flow configurations, and 10–50 W heat inputs were investigated to find their effects on the thermal performance of an AHPHS. Experimental results show that a 10% filling ratio was found to be the optimum charged amount in terms of temperature profile with a low heater surface temperature and water as the working fluid. For the methanol, a 40% filling ratio shows better temperature behavior. Internal working behavior shows not only circular motion but also 3-D flow characteristics moving in axial and circular directions simultaneously. Full article
(This article belongs to the Special Issue Heat Transfer Characteristics of Heat Pipes)
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