TED-AJ03-102 STUDY ON THE NATURAL AIR COOLING OF ELECTRONIC EQUIPMENT CASINGS : EFFECTS OF THE OUTLET VENT AND THE POWER HEATER LOCATIONS ON THE COOLING CAPABOLITY

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概要

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• This paper describes the effects of the outlet vent size and the distance between the outlet vent location and the power heater position on the flow resistance in natural-air-cooled electronic equipment casings. An experiment was carried out using a simple model casing simulated for the practical natural-air-cooled casing which is composed of 4 side walls, a top plate and bottom plate which has an inlet opening. A power heater to be served as a power dissipation unit was placed at its open bottom. An outlet opening was set on one of the side walls. The opening area, the height of the outlet and the heater location were varied. The experimental results were analyzed using the flow resistance coefficient K which was related to the distance between the outlet vent and the power heater position and the heat removal from the outlet vent, and K values were plotted against a pair of Reynolds numbers Re and the outlet vent porosity β which is defined as the ratio of outlet vent open area to the top surface area of the casing as shown in Figure A-1. In Figure A-1,the parameter X was defined using Re and β as follows. X = Re(β^2/(1-β) Almost all the K values lie on the line obtained by the empirical correlation. The line was obtained from the best fit to the measure data as follows. K=0.4X^<-1.5> where, the coefficient having a value of 0.4 is inherent in this apparatus and not a general value. This indicates that the distance between the outlet vent and the heat dissipation unit position h can be considered as a chimney height in practical equipment as well and the definition of β is reasonable. A more detailed discussion requires 3-dimensional thermo-fluid analysis and more precise measurement. However, it is considered that a useful relationship among the flow resistance coefficient, Reynolds number and porosity coefficient can be clarified from a practical point of view.[figure]

• 一般社団法人日本機械学会の論文

著者

• Ishizuka Masaru

  Toyama Prefectural University

• Kitamura Yoji

  Toyama Prefectural University

関連論文

• TED-AJ03-102 STUDY ON THE NATURAL AIR COOLING OF ELECTRONIC EQUIPMENT CASINGS : EFFECTS OF THE OUTLET VENT AND THE POWER HEATER LOCATIONS ON THE COOLING CAPABOLITY
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