Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Detailed CFD modelling of EMC screen for radio base stations: a parametric study
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0001-6139-4400
2009 (English)In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 32, no 1, 145-155 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to make a parametric study of the hydraulic resistance and flow pattern of the flow after an electromagnetic compatibility screen and between two printed circuit boards (PCBs) in a model of a 90° subrack cooling architecture. The parametric study is carried out using a detailed 3-D model of a PCB slot. The detailed model was experimentally validated in a previous paper by the authors. Seven parameters were investigated: velocity, inlet height, screen porosity, PCB thickness, distance between two PCBs, inlet-screen gap and screen thickness. A correlation for the static anddynamic pressure drop, the percentage of dimensionless wetted area, Aw*, and the RMS* factor (a function of the flow uniformity along the PCB) after the screen is reported as a function of six geometrical dimensionless parameters and the Reynolds number. The correlations, that are based on 174 three dimensional simulations, yield good results for the total pressure drop, in which the values are predicted within the interval of ±15%. For the, Aw* all the predicted values are within the interval of ±22% of the observed values. Finally, for the RMS* factor, the majority of the values also have a disagreement of less than 20% of the observed values. These last two parameters are believed to provide a correct insight about the flow pattern after the screen.

Place, publisher, year, edition, pages
2009. Vol. 32, no 1, 145-155 p.
Keyword [en]
Electromagnetic compatibility (EMC) screen, Flow pattern, K-ε, Perforated plate, Porosity, Pressure drop, Renormalization group (RNG), Subrack, Wetted area
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6736DOI: 10.1109/TCAPT.2009.2013337ISI: 000263928700018Scopus ID: 2-s2.0-63049102684OAI: oai:DiVA.org:kth-6736DiVA: diva2:11529
Note
QC 20100630. Uppdaterad från Submitted till Published (20100908)Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Experimental and numerical study of the thermal and hydraulic effect of EMC screens in radio base stations: detailed and compact models
Open this publication in new window or tab >>Experimental and numerical study of the thermal and hydraulic effect of EMC screens in radio base stations: detailed and compact models
2006 (English)Doctoral thesis, comprehensive summary (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: KTH, 2006
Series
Trita-REFR, ISSN 1102-0245 ; 06/57
Keyword
sub-rack, perforated plate, air cooling, 90 degrees turn, flow deistribution, CFD, measurement
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-4265 (URN)978-91-7178-553-4 (ISBN)
Public defence
2007-01-29, Salongen, KTHB, Osquars Backe 31, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100630Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2012-03-23Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Jonsson, Hans

Search in DiVA

By author/editor
Anton Remirez, RaulJonsson, Hans
By organisation
Energy Technology
In the same journal
IEEE transactions on components and packaging technologies (Print)
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 655 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf