The most recent issue of Qpedia Thermal eMagazine is now available for download. As always, this month's issue includes four technical articles focused on the thermal management of electronic devices including:
Cooling ATCA and PICMG Chassis with Ambient Air Refrigeration
Refrigeration is a useful cooling method. A coolant (air or liquid) can be chilled to sub-ambient conditions, and a sub-cooled plate can reduce the temperature of a component, PCB or chassis. The concept of refrigeration for electronics was discussed in a previous Qpedia issue. In this article, we present the salient features that are readily observed when using refrigeration for electronics cooling.
The Thermal Performance of Microchannel and Macrochannel Cold Plates
In recent years, intense activity has gone into improving the capabilities of cold plates. Specifically, the use of microchannels has provided great improvements in cold plate thermal performance. In this article, we will look at equations which can be used for heat transfer coefficients when determining thermal performance, regardless of a cold plate’s channel size.
Thermosyphons: How They Work and Their Practical Limitations
In electronics cooling, heat pipes are used to transfer heat dissipating from devices into the environment. Thermosyphons follow the same principal as heat pipes and are widely used in energy systems. But, unlike heat pipes, thermosyphons are not widely used in the electronics industry. This article helps explain why this is so by discussing their operation.
What are Pitot Tubes and How Do They Measure Velocity?
Pitot tubes are devices for measuring fluid velocity. Applications requiring flow measurement, such as the flow over a wing or through an enclosure, can benefit from the use of Pitot tubes. A Pitot tube is a device in which the pressure differential, based on the energy equation, is translated into velocity.