A review of heat pipe systems for heat recovery and renewable energy applications

Chaudhry, Hassam Nasarullah; Hughes, Ben Richard; Ghаni, Sаud

doi:10.1016/j.rser.2012.01.038

Cited by 228 publications

(86 citation statements)

References 30 publications

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“…Under an assumption that the liquid film thickness is smaller than the vapor column diameter, the saturated wick volume can be modeled as an extended surface. Solving for heat transfer by evaporation from this film-coated fin yields [74]   1 6 5 6 3 * 1 6 1 3…”

Section: Prediction Of Capillary-fed Boiling Thermal Resistancementioning

confidence: 99%

“…Examples including variable conductance gas-loaded heat pipes for constant temperature control, capillary pumped loops for wickless transport over long working distances, rotating heat pipes in which liquid return occurs by centrifugal force, micro heat pipes, thermal diodes, oscillating heat pipes, and others are described in detail in [1][2][3][4]. Recent reviews summarize research on emerging heat pipe applications [5,6], novel working fluid developments [7], advances in modeling approaches [8,9], and performance of archetypal device geometries, such as loop heat pipes [10,11], micro heat pipes [12], and oscillating heat pipes [13]. A comprehensive summary of all such device types, applications, and analysis methodologies is outside the scope of the current review; instead, the focus is on the burgeoning interest and developments in heat pipes targeted at spreading of very high heat fluxes in ultra-thin form factors, as discussed in the following section…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

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Section: Prediction Of Capillary-fed Boiling Thermal Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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“…The Figure below shows that the application of the fibrous coating enhances the heat exchange as compared to a smooth surface. Due EFM 2015 02127-p. 3 to a correspondingly large size, the cooling to the liquid boiling temperature occurs below the half-height point of the sample. This is observed for all the measurement series performed at a different electric power levels applied at the base of the main heater.…”

Section: Research Results and Methodologymentioning

confidence: 99%

“…The heat pipe, schematically shown in figure 1, is a slender tube lined with a structure designed with carefully selected geometrical/physical parameters, containing small amounts of a pressurized fluid, whose boiling temperature is selected in view of the heat exchange conditions [3]. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits distribution, and reproduction in any medium, provided the original work is properly cited.…”

Section: Introductionmentioning

confidence: 99%

Passive heating of the ground surface

Tyburczyk

2016

EPJ Web of Conferences

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Abstract. The phenomenon of phase change is one of the most important contemporary issues of thermal engineering. In particular, this applies to all kinds of heat exchanger systems, which should achieve the highest possible efficiency while reducing investment and operating costs. Some of these systems are heat pipes or thermosyphons, which, among others, are used for the heat transfer, temperature stabilization and the regulation of heat flux density. Additionally, they are passive systems, and therefore do not require an external power supply. Heat pipes can be used to stabilize the surface temperature of roads and driveways. Large heat tubes can be applied for heating the surface of bridges and overpasses, which become icy in unfavorable climatic conditions. The paper presents research on the test facility, whose main component is a long vertical copper fin. The temperature at the base of the fin was kept constant for a given series of measurements. Heat receiving fluid was ethanol at atmospheric pressure. The measurement methodology and the results of investigations were discussed. The surface temperature distribution was measured with the infrared camera, and on this basis the local values of heat flow and the heat transfer coefficient were determined. The results were presented as boiling curves for both the fin with the smooth surface and the one covered with a metal capillary-porous structure. The results obtained are useful in the design of heat exchangers, including passive heating of the ground.

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“…Heat pipes have a proven track record in many areas, including space applications [1], computer and electronics [2], ventilation and air conditioning [3,4], including dehumidification devices [5] heating systems [6,7], solar energy systems [8], water desalination [9] and nuclear energy [10]; however, waste heat recovery seems to be the preferred application for heat-pipe-equipped heat exchangers [3], partly due to some specific characteristics, namely, the simple structure, high efficiency, compact build, reversibility and the lack of energy input requirement.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation and analysis of a gas to water two-phase closed thermosyphon-based heat exchanger

Ramos¹,

Chong²,

Tan³

et al. 2014

WIT Transactions on Engineering Sciences

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Wickless heat pipes are devices with high reliability and heat transfer potential per unit area. Owed to that fact, their application range has been widened in the past 20 years. In the process industry, they are usually coupled to waste heat recovery devices, namely heat exchangers. Heat-pipe-based heat exchangers offer many advantages when compared to conventional waste heat recovery systems, such as increased reliability and reduced cost of production. The design of such devices, however, is not a straightforward process due to the complex modes of heat transfer mechanisms involved. In this paper, the characterisation of a cross-flow heat pipe based heat exchanger is made via the use of ANSYS Fluent, a CFD solver. A design tool with the purpose of predicting the performance of the test unit is also developed and validated through comparison between the CFD model and previous experimental results.

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A review of heat pipe systems for heat recovery and renewable energy applications

Cited by 228 publications

References 30 publications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Passive heating of the ground surface

CFD simulation and analysis of a gas to water two-phase closed thermosyphon-based heat exchanger

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