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Vaporizable Dielectric Fluid Cooling of IGBT Power Semiconductors
Keywords: Dielectric, Thermal, IGBT
Liquid cooling system concepts for electronics thermal management applications have focused on the use of single-phase water as the coolant. The use of water as a coolant in many applications requires additives for biological control and antifreeze, colorants, and other inhibitors. Water or deionize water coolants also require, variously, particle filters, deionization filters and similar hardware components specific to the physical properties of water. Military and aerospace liquid cooling systems have utilized dielectric electronic liquids such as perfluorinated fluorocarbons from several suppliers and polyalphaolefins (PAO). Selection of other types of liquid coolant is driven by system requirements and impacts several aspects of the system design, including liquid coolant heat capacity (typically, always compared to properties of water), need for additives, safety, electrical hazard prevention, and maintenance. Refrigeration has been utilized in selected applications for automated test equipment, certain types of server rack implementations, for military applications, and for stand-alone enclosures. An alternative cooling technology is the use of a dielectric liquid in a low-flow rate, pumped cooling system utilizing two-phase liquid cold plates, a flow-through pump, a liquid/vapor separator, and a vapor condenser or heat exchanger. Use of a vaporizable dielectric liquid will be described in this presentation as a practical implementation in the power semiconductor market that is now being commercialized. The vaporizable dielectric liquid used in this development project is R-134a, a common refrigerant. Other vaporizable dielectric liquids may also be utilized with the appropriate pump and component modifications as required.
David L. Saums , Principal
Amesbury, MA

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