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Compact CFD modelling of EMC screen for radio base stations: a porous media approach and a correlation for the directional loss coefficients
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. TECNUN, University of Navarra, Navarra 31080, Spain .
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0001-6139-4400
2007 (English)In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 30, no 4, 875-885 p.Article in journal (Refereed) Published
Abstract [en]

A methodology to obtain the directional pressure loss coefficients in a porous media model of an electromagnetically compatible screen of a radio base station model is presented. The directional loss coefficients of this compact model are validated against a detailed computational fluid dynamics model not only by comparing the total pressure drop, but also by evaluating the flow pattern after the screen. The detailed model was validated in an earlier article by the authors. A parametric study is conducted for 174 cases. Seven parameters were investigated: velocity, inlet height, screen porosity, printed circuit board (PCB) thickness, inlet-screen gap, distance between two PCBs and screen thickness. Based on the compact model parametric study, two correlations for the directional loss coefficients are developed as a function of the Reynolds number and the above geometrical parameters. The average disagreement between the compact model that uses the directional loss coefficients from the correlations and the detailed model was of 3% for the prediction of the total pressure drop and less than 6.5% and 9.5% for two coefficients that accurately characterize the flow pattern.

Place, publisher, year, edition, pages
IEEE Press, 2007. Vol. 30, no 4, 875-885 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6737DOI: 10.1109/TCAPT.2007.910065ISI: 000251431100042Scopus ID: 2-s2.0-36949028784OAI: oai:DiVA.org:kth-6737DiVA: diva2:11530
Note

Updated from "Accepted" to "Published". QC 20150702

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

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Jonsson, Hans

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