Radiation heat transfer can be a significant portion of total heat transfer from a heat sink, particularly in natural convection flows. The enclosures for most natural-convection-cooled indoor and outdoor electronic equipments, such as pole or wall-mount base stations and radio units, include external fins to improve natural convection and radiation heat transfer rates. Early … [Read more...]
Reader Poll Declares ElectronicsCooling a Winner!
Reader Poll Declares ElectronicsCooling a Winner! Here in the United States we are in the midst of the campaign season leading to our national election in November to choose our next president. While Senator John McCain is the clear winner of the Republican nomination for president, as I draft this column, the contest between Senators Hillary Clinton and Barack Obama to win the … [Read more...]
On The Challenges of Thermal Characterization of High-Power, High-Brightness LED Packages
Introduction In recent years, high-power, high-brightness Light Emitting Diodes (LEDs) have penetrated into an ever-increasing number of lighting applications. For such devices, maintaining a low die temperature is becoming a huge challenge because of the escalating power density (e.g., 200-300 W/cm2 for the latest generation). Active cooling solutions are rarely considered as … [Read more...]
Modeling Multiple Heat Source Problems In Electronic Systems
Introduction Readers of ElectronicsCooling know about the rapid pace of technological developments towards an increasingly higher level of miniaturization and, hence, an incredible increase of dissipation power densities. Thus, restating some very well known facts (such as, we have already attained a level of power density that is comparable to nuclear power stations) would not … [Read more...]
Heat Spreading: Not a Trivial Problem
Introduction Heat spreading is essentially area enlarging: the larger the area, the more heat can be removed at the same temperature difference (subject to certain limits). Unfortunately, except for the simplest of cases, the equations describing heat spreading physics do not have an explicit mathematical solution. Hence, we have to rely on clever approximations or suitable … [Read more...]
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