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Showing papers on "Heat pipe published in 2017"


Journal ArticleDOI
TL;DR: In this paper, the authors present a review on various techniques of heat transfer enhancement in latent heat thermal energy storage (LHTES) systems, which can be achieved through either geometric configuration and/or thermal conductivity enhancement.
Abstract: This paper presents a state-of-the-art review on various techniques of heat transfer enhancement in latent heat thermal energy storage (LHTES) systems. Heat transfer enhancement in LHTES systems can be achieved through either geometric configuration and/or thermal conductivity enhancement. The use of extended surfaces such as fins or heat pipes is a common technique for heat transfer enhancement in LHTES systems and therefore, reviewed in details in this paper. Next, we studied the thermal conductivity enhancement techniques, which include the use of porous materials, nanoparticles with high thermal conductivity, and low-density materials. Finally, studies involving combined techniques for heat transfer enhancement are reviewed in the paper. The paper discusses research gaps in the methods of heat transfer enhancement for LHTES systems and proposed some recommendations.

403 citations


Journal ArticleDOI
01 Jun 2017-Energy
TL;DR: A comprehensive review of the state-of-the-art applications, materials and performance of current heat pipe devices can be found in this paper, where heat pipe technologies offer many key advantages over conventional practices.

317 citations


Journal ArticleDOI
TL;DR: In this article, a heat pipe-assisted phase change material (PCM) based battery thermal management (BTM) system is designed to fulfill the comprehensive energy utilization for electric vehicles and hybrid electric vehicles.

291 citations


Journal ArticleDOI
TL;DR: In this article, phase change materials (PCMs) are used as a thermal storage to store the latent heat of condensing vapor in solar stills, which enables the desalination process to continue after sunset without causing a decrease in the yield.

182 citations


Journal ArticleDOI
Zhoujian An1, Li Jia1, Yong Ding1, Chao Dang1, Xuejiao Li1 
TL;DR: In this paper, the effect of temperature on the capacity fade and aging of Li-ion power battery is investigated and the electrode structure, including electrode thickness, particle size and porosity, are analyzed.
Abstract: Lithium-ion power battery has become one of the main power sources for electric vehicles and hybrid electric vehicles because of superior performance compared with other power sources. In order to ensure the safety and improve the performance, the maximum operating temperature and local temperature difference of batteries must be maintained in an appropriate range. The effect of temperature on the capacity fade and aging are simply investigated. The electrode structure, including electrode thickness, particle size and porosity, are analyzed. It is found that all of them have significant influences on the heat generation of battery. Details of various thermal management technologies, namely air based, phase change material based, heat pipe based and liquid based, are discussed and compared from the perspective of improving the external heat dissipation. The selection of different battery thermal management (BTM) technologies should be based on the cooling demand and applications, and liquid cooling is suggested being the most suitable method for large-scale battery pack charged/discharged at higher C-rate and in high-temperature environment. The thermal safety in the respect of propagation and suppression of thermal runaway is analyzed.

176 citations


Journal ArticleDOI
TL;DR: In this paper, the feasibility of a new challenging use of Aluminum Oxide (Al 2 O 3 ) and Carbon Black (CB) nanoparticles to enhance the thermal properties: thermal conductivity, specific heat, and latent heat of pure paraffin waxes.

163 citations


Journal ArticleDOI
TL;DR: The thermal performance of a heat pipe, using nano enhanced phase change material (PCM) as an energy storage medium for electronic cooling applications is studied in this article, where the PCM is placed around the adiabatic section of the heat pipe in which heat is absorbed and released depending on the power inputs at the evaporator and fan speeds at the condenser.

149 citations


Journal ArticleDOI
TL;DR: In this paper, a horizontal phase change material (PCM)-assisted heat pipe system for electronic cooling was introduced as a potential solution to this problem and a computational fluid dynamic model was developed and validated to assist the investigation.

129 citations


Journal ArticleDOI
TL;DR: In this article, a two-dimensional numerical model is developed to simulate the performance of a heat pipe using various nanofluids, and it was observed that the use of Nanofluid reduces the axial flow pressure of the fluid inside the wick.

117 citations


Journal ArticleDOI
TL;DR: In this paper, a jumping-drop vapor chamber consisting of parallel plates of a superhydrophilic evaporator and a super-hydrophobic condenser is proposed to address mobile hotspots with a pathway toward effective thermal transport in the out-ofplane direction.
Abstract: Hotspot cooling is critical to the performance and reliability of electronic devices, but existing techniques are not very effective in managing mobile hotspots. We report a hotspot cooling technique based on a jumping-drop vapor chamber consisting of parallel plates of a superhydrophilic evaporator and a superhydrophobic condenser, where the working fluid is returned via the spontaneous out-of-plane jumping of condensate drops. While retaining the passive nature of traditional vapor-chamber heat spreaders (flat-plate heat pipes), the jumping-drop technique offers a mechanism to address mobile hotspots with a pathway toward effective thermal transport in the out-of-plane direction.

108 citations


Journal ArticleDOI
TL;DR: In this article, the authors conduct a critical review on the essential thermal absorbers and their integration methods for the currently available PV modules for the purpose of producing the combined PV/T modules.
Abstract: Thermal absorbers and their integration methods are critical to solar photovoltaic/thermal (PV/T) modules. These two elements directly influence the cooling effort of PV layers and as a result, the related electrical/thermal/overall efficiency. This paper conducts a critical review on the essential thermal absorbers and their integration methods for the currently-available PV modules for the purpose of producing the combined PV/T modules. A brief overview of different PV/T technologies is initially summarized, including aspects of their structure, efficiencies, thermal governing expressions and their applications. Seven different types of thermal absorbers and four corresponding integration methods are subsequently discussed and summarized in terms of their advantages/disadvantages and the associated application for various PV/T modules. Compared to traditional thermal absorbers, such as sheet-and-tube structure, rectangular tunnel with or without fins/grooves and flat-plate tube, these four types, i.e. micro-channel heat pipe array/heat mat, extruded heat exchanger, roll-bond heat exchanger and cotton wick structure, are promising due to the significant enhancement in terms of efficiency, structure, weight, and cost etc. The appropriate or suitable integration method varies in different cases, i.e. the ethylene-vinyl acetate (EVA) based lamination method seems the best option for integration of PV layer with thermal absorber when compared with other conventional methods, such as direct contact, thermal adhesive and mechanical fixing. Finally, suggestions for further research topics are proposed from five aspects. The overall research results would provide useful information for the assistance of further development of solar PV/T modules with high feasibility for widespread application in energy supply even at district or city-level in the near future.

Journal ArticleDOI
TL;DR: In this article, an overview of current status of free cooling technologies applicable for datacenters had been discussed, including airside economizers, waterside economizers and heat pipe technology.

Journal ArticleDOI
TL;DR: In this article, a jumping-droplet-based electric-field-enhanced (EFE) condensation method was proposed to achieve active hot spot cooling in electronic devices.
Abstract: Demand for enhanced cooling technologies within various commercial and consumer applications has increased in recent decades due to electronic devices becoming more energy dense. This study demonstrates jumping-droplet based electric-field-enhanced (EFE) condensation as a potential method to achieve active hot spot cooling in electronic devices. To test the viability of EFE condensation, we developed an experimental setup to remove heat via droplet evaporation from single and multiple high power gallium nitride (GaN) transistors acting as local hot spots (4.6 mm × 2.6 mm). An externally powered circuit was developed to direct jumping droplets from a copper oxide (CuO) nanostructured superhydrophobic surface to the transistor hot spots by applying electric fields between the condensing surface and the transistor. Heat transfer measurements were performed in ambient air (22–25 °C air temperature, 20%–45% relative humidity) to determine the effect of gap spacing (2–4 mm), electric field (50–250 V/cm) and app...

Journal ArticleDOI
TL;DR: In this paper, an experimental investigation of a newly proposed solar collector that integrates a closed-end pulsating heat pipe (PHP) and a compound parabolic concentrator (CPC) is reported.

Journal ArticleDOI
TL;DR: In this paper, a novel approach to internal thermal management of cylindrical battery cells to lower the thermal resistance for heat transport through the inside of the cell is investigated, which can emulate the performance of a more complex pack-level double tab cooling approach whilst targeting cooling at a single tab.

Journal ArticleDOI
TL;DR: In this article, a Tesla-type valve is successfully designed for promoting circulation in a pulsating heat pipe (PHP) and improving the thermal resistance, which is tested by laminar single-phase modeling and by steady two-phase flow experiments.

Journal ArticleDOI
TL;DR: In this article, the influence of working fluids on startup mechanism and thermal performance of a closed loop Pulsating Heat Pipe (CLPHP) is carried out on 2mm, nine turn copper capillary.

Journal ArticleDOI
TL;DR: In this paper, a comprehensive review about the recent advances related with the application of the nano fluid in the heat pipe solar collectors is given, including theoretical, numerical and experimental up-to-date works related with nanotechnology applications in this type of the solar collectors.

Journal ArticleDOI
TL;DR: In this article, the performance of the electric motor thermal management system using L-shaped flat heat pipes was evaluated using a prototype of a 0.5 HP conventional electric motor where the rotor and the coil were replaced by a cartridge heater to simulate the heat generation.

Journal ArticleDOI
TL;DR: In this article, the phase change material (PCM) composited by erythritol and expanded graphite with melting temperature of 119°C was filled in the aluminum pipes, and those pipes were placed inside the evacuated tubes.

Journal ArticleDOI
TL;DR: In this article, a heatpipe solar (HPS) photovoltaic/thermal (PV/T) heat pump system, combining HPS PV/T collector with heat pump, is proposed.

Journal ArticleDOI
TL;DR: In this paper, a rack cooling system with the pulsating heat pipe and inner duct in data center is suggested and the heat transfer performance is numerically investigated and the inner structure of the rack is designed.

Journal ArticleDOI
TL;DR: In this article, two different heat pipes made of copper and glass were prepared to investigate the behavior of magnetic nanofluids and the results indicated that the ferrofluid is more stable in the glass heat pipe than in the copper heat pipe.

Journal ArticleDOI
TL;DR: In this article, the authors investigated the thermal performance of composite ultra-thin heat pipes (UTHPs), which are fabricated by flattening cylindrical heat pipes with outer diameter of 2 mm.

Journal ArticleDOI
TL;DR: In this article, a case study is conducted with a loop-heat pipe for cooling an 80-W LED street lamp equipped with the wick that is characterized in this study, where an exhaustive analysis of the improvements, in terms of selected working fluid and the way of fabrication of the Wick through the use of a novel technique, where a restrictive condition in the maximum temperature of the fluid was imposed in comparison with other loop heat pipes of similar characteristics, equipped with non-optimized commercial wicks.

Journal ArticleDOI
TL;DR: In this article, the authors used thermoelectric generators (TEGs) and heat pipes to make use of wasted heat from a car engine to reduce CO2 emissions and running costs.

Journal ArticleDOI
TL;DR: In this article, the authors presented an innovative pathway to an improved heat supply into the concentric shape-adapted TEG modules, integrating the heat pipe technologies, which relies on a phase changing approach which enhances the heat flux through the TEG surface.

Journal ArticleDOI
TL;DR: In this article, the thermal performance of a helically-micro-grooved heat pipe working with water-based alumina nanofluid was investigated and the effects of the inclination angle (0°, 30°, 60° and 90°), filling ratio (20, 40, 60 and 80%) and heat input (45:65 W) on heat transfer characteristics of the heat pipe were investigated.

Journal ArticleDOI
TL;DR: In this article, the performance of finned heat pipe assisted LHTESS with nano-enhanced phase change material (NEPCM) was numerically investigated from the viewpoint of discharging process.

Journal ArticleDOI
TL;DR: In this paper, the performance of a conventional heat pipe with nanofluid-charged heat pipe was evaluated and a revised Merit number was introduced for the performance evaluation of the heat pipe.