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Experimental and numerical study of the thermal and hydraulic effect of EMC screens in radio base stations: detailed and compact model
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik.
2006 (English)Doctoral thesis, monograph (Other scientific)
Abstract [en]

Today’s telecommunication cabinets use Electro Magnetic Compliance (EMC) screens in order to reduce electromagnetic noise that can cause some miss functions in electronic equipment.

Many radio base stations (RBSs) use a 90-degree building architecture: the flow inlet is perpendicular to the EMC screen, which creates a complex flow, with a 90-degree air turn, expansions, compressions, perforated plates and PCBs. It is of great interest to study how the EMC screen interacts with the rest of components and analyze the total pressure drop and how much the flow pattern changes due to the placement of the screen.

Velocity, pressure and temperature measurements as well as flow pattern visualizations have been carried out to gain good insight into the flow and heat transfer characteristics in a subrack model of an RBS. Furthermore, these measurements have been very useful for validating detailed CFD models and evaluating several turbulence models.

Nowadays, industrial competition has caused a substantial decrease in the time-to-market of products. This fact makes the use of compact models in the first stages of the design process of vital importance. Accurate and fast compact models can to a great extent decrease the time for design, and thus for production.

Hence, to determine the correlations between the pressure drop and flow pattern on the PCBs as a function of the geometry and the Reynolds number, based on a detailed CFD parametric study, was one objective. Furthermore, the development of a compact model using a porous media approach (using two directional-loss coefficients) has been accomplished. Two correlations of these directional loss coefficients were found as a function of the geometry and Reynolds number.

Place, publisher, year, edition, pages
Stockholm: Kungliga Tekniska högskolan. Institutionen för energiteknik , 2006. , 94 p.
Series
Trita-REFR, ISSN 1102-0245 ; 06:57
Keyword [en]
sub-rack, perforated plate, air cooling, 90 degrees turn, flow deistribution, CFD, measurement
Identifiers
URN: urn:nbn:se:hig:diva-1301ISBN: 978-91-7178-553-4 (print)OAI: oai:DiVA.org:hig-1301DiVA: diva2:117963
Public defence
(English)
Available from: 2008-05-27 Created: 2008-05-27 Last updated: 2011-01-19Bibliographically approved

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Ämnesavdelningen för energi- och maskinteknik

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CiteExportLink to record
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Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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Language
  • sv-SE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
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Output format
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