CFD-Assisted Optimization of Chimneylike Flows to Cool an Electronic Device

Natural convection cooling provides a reliable, cost-effective, energy-efficient and noise-free method to cool electronic equipment. However, the heat transfer coefficient associated with natural convection mode is usually insufficient for electronic cooling and it requires enhancement. Chimneylike flows developed within the cabinets of electronic devices can provide better mass flow and heat transfer rates and can lead to greater cooling efficiency. Constraints in the design of natural convection cooling systems include efficiency of packing, aesthetics, and concerns of material reduction. In this paper, methods based on computational fluid dynamics are used to study the effects of parameters such as (1) vertical alignment of the slots, (2) horizontal alignment of slots, (3) area of slots, (4) differential slot opening, and (5) zonal variation in heat generation on natural convection cooling within such design constraints. Insights thus derived are found useful for designing an energy-efficient and ecofriendly cooling system for electronic devices.

[1]  Shinji Nakagawa,et al.  Chimney effect on natural air cooling of electronic equipment under inclination , 2010, 2010 3rd International Conference on Thermal Issues in Emerging Technologies Theory and Applications.

[2]  Shinji Nakagawa,et al.  Effects of Clearance Between Heating Walls on Natural Cooling in a Channel Model of Electronic Equipment , 2007 .

[3]  Gennady Ziskind,et al.  Chimney-enhanced natural convection from a vertical plate: experiments and numerical simulations , 2003 .

[4]  Shinji Nakagawa,et al.  Study on the chimney effect in natural air‐cooled electronic equipment casings under inclination: Proposal of a thermal design correlation that includes the porosity coefficient of an outlet opening , 2006 .

[5]  Masaru Ishizuka,et al.  Study on the natural air cooling of electronic equipment casings: Effects of the outlet vent and the power heater locations on the cooling capability , 2002 .

[6]  J. Newberger.  Totally enclosed naturally cooled electronic enclosures , 1996, InterSociety Conference on Thermal Phenomena in Electronic Systems, I-THERM V.

[7]  Masaru Ishizuka,et al.  A Study on the Effect of Inclination on Thermal Behaviors of Natural Convection Inside Thin Electronic Equipment Casing , 2003 .

[8]  Masaru Ishizuka,et al.  Study on Chimney Effect in Natural Air Cooled Electronic Equipment Casings under Inclination (The Proposal of a Thermal Design Correlation with Inclination) , 2004 .

[9]  Ahmet Koca.  Numerical analysis of conjugate heat transfer in a partially open square cavity with a vertical heat source , 2008 .

[10]  Shinji Nakagawa,et al.  Study on Chimney Effect in Natural Air Cooled Electronic Equipment Casings under Inclination (2nd Report, The Proposal of a Thermal Design Correlation including Porosity Coefficient of an Outlet Opening) , 2005 .

[11]  Masud Behnia,et al.  Numerical investigation of natural convection in a vertical slot with two heat source elements , 1996 .

[12]  Hsien-Chie Cheng,et al.  CFD-based thermal characterization of board-level microelectronic devices under natural convection cooling , 2007, 2007 International Microsystems, Packaging, Assembly and Circuits Technology.

[13]  El Alami Semma,et al.  Chimney effect in a T form cavity with heated isothermal blocks: The blocks height effect , 2004 .

[14]  Shinji Nakagawa,et al.  Numerical and experimental study of the effect of inclination on the thermal behaviour of natural convection inside a thin electronic equipment casing , 2004 .

[15]  F. Penot,et al.  Electronic components cooling by natural convection in horizontal channel with slots , 2005 .

[16]  Dimos Poulikakos,et al.  Experiments on the cooling by natural convection of an array of vertical heated plates with constant heat flux , 1987 .

[17]  哲朗 大串,et al.  自然換気型電子機器筺体の熱設計手法の研究(発熱密度の異なる鉛直平行基板群を有する筐体内の自然対流熱伝達特性)(熱工学, 内燃機関, 動力など) , 2002 .

[18]  Antonio Auletta,et al.  Heat transfer enhancement by the chimney effect in a vertical isoflux channel , 2001 .