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Modelling of EMC screens for radio base stations Part 1: Experimental parametric study
KTH, Superseded Departments, Energy Technology. University of Gävle, Sweden.
KTH, Superseded Departments, Energy Technology. University of Gävle, Sweden.ORCID iD: 0000-0001-6139-4400
2004 (English)In: ITherm 2004, Vol 1, IEEE , 2004, 463-470 p.Conference paper (Refereed)
Abstract [en]

Enclosing electronics in sealed metal boxes provides good electromagnetic shielding, but evidently restricts the air movement necessary for adequate cooling. In order to meet ElectroMagnetic Compatibility (EMC) requirements, a perforated plate (an EMC screen) must be used. The design of this screen must provide a sufficient free area ratio for the adequate airflow, but at the same time the holes must be small enough to block electromagnetic radiation. An experimental set-up that represents a Radio Base Station (RBS) subrack was built inside a wind tunnel. The airflow pattern and pressure drop through the EMC screen were investigated experimentally for different subrack geometries, screen porosities and velocities, and the recirculation zones were identified. The study was performed by means of pressure and velocity measurements, together with smoke visualization under isothermal conditions.

Place, publisher, year, edition, pages
IEEE , 2004. 463-470 p.
Keyword [en]
EMC, Hot wire anemometer, Inclined flow, Perforated plate, Pressure drop, Pressure measurement, Smoke visualization, Subrack
National Category
Other Engineering and Technologies
URN: urn:nbn:se:kth:diva-6731ISI: 000222478500065ScopusID: 2-s2.0-4444297390ISBN: 0-7803-8357-5OAI: diva2:11524
ITherm 2004 - Ninth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems; Las Vegas, NV; United States; 1 June 2004 through 4 June 2004

QC 20100629

Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2014-12-09Bibliographically 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
Trita-REFR, ISSN 1102-0245 ; 06/57
sub-rack, perforated plate, air cooling, 90 degrees turn, flow deistribution, CFD, measurement
National Category
Energy Engineering
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
QC 20100630Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2012-03-23Bibliographically approved

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