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Smoke and CFD visualization of the flow after an EMC screen in a sub-rack model
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0001-6139-4400
2005 (English)In: Proceeding of the THERMINIC 05, 2005Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2005.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-6732OAI: oai:DiVA.org:kth-6732DiVA: diva2:11525
Note
QC 20100629Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2012-01-23Bibliographically 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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