Author Archives: akoss

Qpedia, Issue 98, has just been released! Download the issue.

Featured articles in this issue include:

COOLING IGBTS USING VAPORIZABLE DIELECTRIC FLUIDS

Dramatic increases in both power density and total power dissipation for power electronic systems, especially vehicle and airborne systems, together with demands for increased performance and speed of response, limit the application of a traditional forced convection air-cooled or a single phase liquid system. This article discusses how the newly developed Vaporizable Dielectric Fluid (VDF) cooling system, uses common dielectric refrigerants to effectively cool IGBT devices.

OPTIMAL HEAT SINK DESIGN FOR NATURAL CONVECTION IN VERTICAL ORIENTATION

Many tough-to-cool electronics applications don’t allow the use of fans, therefore heat sink solutions need to be optimized through natural convection. This article explores and compares the optimal design of traditional pin, straight fin and nontraditional heat sink designs in natural convection.

FUNDAMENTALS: HEAT PIPE HEAT TRANSPORT CAPABILITY

In this new section, Qpedia reviews fundamental thermal engineering principles, calculations and equations needed for the successful cooling of electronics. In this issue we discuss the heat transport capabilities and limitations of heat pipes.

INDUSTRY DEVELOPMENTS: MILITARY ELECTRONICS COOLING

Modern militaries around the world are equipped with very hot-running electronics that must reliably provide high levels of performance in critical situations. In addition, thermal management for military electronics can be extremely challenging, due to the strict size, weight and power (SWaP) requirements, rugged use, harsh environments, and cost restraints. This article presents recent cooling developments for military electronics.

TECHNOLOGY REVIEW: LED THERMAL MANAGEMENT

Qpedia reviews innovative technologies developed for electronics cooling applications. This section presents selected patents that were awarded to developers around the world to address cooling challenges. In this issue our spotlight is on thermal management systems for LED lighting.

COOLING NEWS

The latest products & technology from around the thermal management industry.

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Qpedia, Issue 96 has just been released and can be downloaded at: http://www.qats.com/Qpedia-Thermal-eMagazine/Back-Issues

Featured articles include:

Using Integrated Planar Thermosyphon PCBs to Enhance Cooling of High Brightness LEDs

Because high brightness LEDs have a heat flux that reaches an excess of 80 W/cm², thermal management is critical to ensure the LED properly performs. This article discusses the promising idea of improving the heat dissipation from the LED package to the PCB using thermosyphons. While the concept of a planar thermosyphon to enhance heat transfer by itself is not new, integrating it into a printed circuit board is innovative and appears to be a promising technology.

Nanofluids in Heat Pipes

The thermophysical properties of the working fluid have a direct impact on a heat pipe’s performance. Water is the most common and effective heat transfer fluid in the electronics cooling industry, but its properties can be enhanced by adding nano-particles. This article discusses what nanofluids are available and their benefits on a heat pipe’s performance.

Fundamentals: Effective Thermal Conductivity of a Heat Pipe

In this new section, Qpedia reviews fundamental thermal engineering principles, calculations and equations needed for the successful cooling of electronics. This issue we discuss how to identify the thermal conductivity of a heat pipe.

Industry Developments: Cooling COB LEDs

Chip-on-board (COB) LED’s are one of the most widely used types of LED packaging. However, the tight spacing between the LEDs and small light emitting surface that make COB LEDs attractive, also present high heat fluxes that must be addressed. Because COBs have such a small surface area, addressing power density is the primary challenge. This article reviews the recent methods that LED manufacturers are using to cool COB LEDs.

Technology Review: Phase Change Materials

Qpedia reviews innovative technologies developed for electronics cooling applications. This section presents selected patents that were awarded to developers around the world to address cooling challenges. In this issue our spotlight is on phase change materials.

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