Evaporative spray cooling of power electronics using high temperature coolant

Turek, Louis; Rini, Daniel P.; Saarloos, Benjamin A.; Chow, L. C.

doi:10.1109/itherm.2008.4544290

Cited by 24 publications

(8 citation statements)

References 2 publications

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“…While the application with the wall temperature equal to 80 • C is solved in single-phase flow without phase change by assuming that all the walls have the same temperature as a boundary condition. The investigation on evaporative spray cooling for power inverter application showed that the heat fluxes of 148 W/cm 2 were removed without exceeding IGBT (Insulated-Gate Bipolar Transistor) junction temperature of 125 • C [46]. According to this value, the convective heat flux simulated for the spray engine cooling and electronic components can meet the practical requirement.…”

Section: Determination Of the Dissipated Heat Flux For Different Application Areas The Convective Heat Transfer Coefficient And The Fin Ementioning

confidence: 94%

Numerical Study on the Flow and Heat Transfer Coupled in a Rectangular Mini-Channel by Finite Element Method for Industrial Micro-Cooling Technologies

Kamdem

Zhu

2020

Fluids

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Nowadays, cooling high thermal flows in compact volumes continues to be one of the crucial problems in the industry. With the advent of advanced technologies, much more attention has been paid to how to improve the performance of cooling systems in the area of micro-technologies. Rectangular mini-channels are typical representatives which commonly used for cooling applications. However, micro-technologies still face the problem of low performance due to the low productivity of cooling related to unbefitting physical parameter values. Here, this work studies the applicability of the heat transfer scheme of convective flow and flow boiling in a rectangular mini-channel for satisfying the cooling requirement of industrial micro-technologies, through a simulation model governed by the coupled mechanism from Navier-Stokes (N-S) equation and heat transfer equations with phase change effect. In this work, various hydraulic diameters and different inlet fluid speed are used to calculate the different velocity profiles, pressure drops, coefficients of friction and finally, the distribution of the temperatures and dissipated heat flux. The simulation results show the applicability of the rectangular mini-channel in diverse applications such as engine cooling, electronic components, automotive on-board electronics and aerospace engineering. Flow boiling simulation results reveal that the obtained patterns were smooth mixture flow and discrete flow. The dissipated heat flux can reach 1.02–5.34 MW/m2 for a hydraulic diameter of 0.5 mm. We show that the system with the gradient temperature that evolves increasingly along the top and bottom walls of the channels presents the highest heat flux dissipated in flow boiling. Additionally, the fin efficiency of the system is 0.88 and the coefficient value of convective heat transfer is in the range between 5000 < h < 100,000, which indicates the flow boiling heat transfer is effective in the mini-channel when the Reynolds number is less than 400. It provides a significant heat exchange for cooling in these application areas.

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Section: Determination Of the Dissipated Heat Flux For Different Application Areas The Convective Heat Transfer Coefficient And The Fin Ementioning

confidence: 94%

Numerical Study on the Flow and Heat Transfer Coupled in a Rectangular Mini-Channel by Finite Element Method for Industrial Micro-Cooling Technologies

Kamdem

Zhu

2020

Fluids

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“…Ibilgailu elektrikoaren alorrean egindako beste hainbat ikerketa-lanek ere [12,13,14] emaitza eraginkorrak erakusten dituzte.…”

Section: Itxaso Aranzabal Asier Matallana Oier Onederra Iñigo Martunclassified

Ibilgailu elektrikoen potentzia-bihurgailuen hozte-metodoak

Aranzabal

Matallana

Oñederra

et al. 2017

EKAIA

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Laburpena: Ibilgailu elektrikoari loturiko potentzia-bihurgailuetan, korronte-dentsitate handitan (500 A ingurukoak) lan egiten duten IGBT transistoreak eta diodoak erabiltzen dira. Korronte altuak direla eta, handitu egiten dira gailu erdieroale horietan gertatzen diren kommutazio-eta kondukzio-galerak, eta ondorioz, potentzia-erdieroaleak berotu egiten dira. Moduluen efizientzia eta fidagarritasuna ziurtatzeko, beharrezkoa da hozte-sistema eraginkor eta egoki bat aukeratzea. Artikulu honetan, potentziabihurgailuen moduluen hozte-metodoak berrikusi eta eztabaidatuko dira.Hitz-gakoak: ibilgailu elektrikoa, potentzia-bihurgailua, hozte-metodoak. Abstract:The power inverter modules asociated to Electric Vehicles (EV) are equipped with IGBTs and Diodes working at high currents that can reach 500 A. The high currents increase power losses, which become in heat and reduce the efficiency of the semiconductor. To ensure high power density power inverters reliability and fiability is necessary to design very efficient cooling systems. In this paper power inverter modules different cooling options will be reviewed. Advantages and disadvantages of such systems will be highlighted.

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“…The performance of water/methanol mixtures was found to be between those of pure water and methanol, although in some conditions, the mixture with 50% ethanol concentration offered comparable performance to that of pure water. Turek et al [17] evaluated the spray cooling for power inverter applications using high temperature (100°C) water/propylene glycol (WPG) at a 50% concentration by volume. Their spray cooling approach removed heat fluxes of up to 148 W/cm 2 without exceeding IGBT junction temperature of 125°C, greatly reduced the overall thermal resistance, and increased inverter power level up to 3.4X compared to conventional cold plates.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Spray Cooling With Water/2-Propanol Binary Mixture: Investigation of Mass Diffusion Resistance

Obuladinne

Bostanci

2016

Volume 8: Heat Transfer and Thermal Engineering

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Two-phase spray cooling has been an emerging thermal management technique offering high heat transfer coefficients (HTCs) and critical heat flux (CHF) levels, near-uniform surface temperatures, and efficient coolant usage that enables to design of compact and lightweight systems. Due to these capabilities, spray cooling is a promising approach for high heat flux applications in computing, power electronics, and optics. The two-phase spray cooling inherently depends on saturation temperature-pressure relationships of the working fluid to take advantage of high heat transfer rates associated with liquidvapor phase change. When a certain application requires strict temperature and/or pressure conditions, thermophysical properties of the working fluid play a critical role in attaining proper efficiency, reliability, or packaging structure. However, some of the commonly used working fluids today, including refrigerants and dielectric liquids, have relatively poor properties and heat transfer performance. In such cases, utilizing binary mixtures to tune working fluid properties becomes an alternative approach.This study aimed to conduct an initial investigation on the spray cooling characteristics of practically important binary mixtures and demonstrate their capability for challenging high heat flux applications. The working fluid, water/2-propanol binary mixture at various concentration levels, specifically at x1 (liquid mass fraction of 2-proponal in water) of 0.0 (pure water), 0.25, 0.50, 0.879 (azeotropic mixture) and 1.0, represented both non-azeotropic and azeotropic cases. Tests were performed on a closed loop spray cooling system using a pressure atomized spray nozzle with a constant liquid flow rate at corresponding 20 o C subcooling conditions and 1 Atm pressure. A copper test section measuring 10 mm x 10 mm x 2 mm with a plain, smooth surface simulated high heat flux source. Experimental procedure involved controlling the heat flux in increasing steps, and recording the steady-state temperatures to obtain cooling curves in the form of surface superheat vs heat flux. The obtained results showed that pure water (x1=0.0) and 2-propanol (x1=1.0) provide the highest and lowest heat transfer performance, respectively. At a given heat flux level, the HTC values indicated strong dependence on x1, where the HTCs depress proportional to the concentration difference between the liquid and vapor phases. The CHF values sharply decreased at x1≥0.25.

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Evaporative spray cooling of power electronics using high temperature coolant

Cited by 24 publications

References 2 publications

Numerical Study on the Flow and Heat Transfer Coupled in a Rectangular Mini-Channel by Finite Element Method for Industrial Micro-Cooling Technologies

Numerical Study on the Flow and Heat Transfer Coupled in a Rectangular Mini-Channel by Finite Element Method for Industrial Micro-Cooling Technologies

Ibilgailu elektrikoen potentzia-bihurgailuen hozte-metodoak

Two-Phase Spray Cooling With Water/2-Propanol Binary Mixture: Investigation of Mass Diffusion Resistance

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