November 2007
The Institute of Electrical and Electronics Engineers (IEEE) named "A Comparison of Hybrid Electric Vehicle Power Electronics Cooling Options" by National Renewable Energy Laboratory (NREL) researcher's Michael O'Keefe and Kevin Bennion as the "Best Paper" of their 2007 Vehicle Power and Propulsion Conference (Arlington, Texas, Sept. 9-12, 2007).
NREL's study, as outlined in the paper, is significant because it assesses the trade offs of using various thermal control technologies to meet the FreedomCAR cost, weight, and volume targets by eliminating a dedicated power electronics cooling loop. Advanced thermal control technology for power electronics is critical to enable electric, hybrid-electric, and fuel cell vehicles capable of reducing U.S. petroleum consumption.
Michael O'Keefe (left) and Kevin Bennion (right) accepting IEEE Award
NREL researchers used parametric finite element analysis to quantify the heat dissipation potential of three inverter package configurations over a range of control factors. The authors showed that using engine coolant at 105°C will require advanced cooling technologies such as direct backside, double-sided, or integrated heat sink cooling. NREL researchers are currently working with the FreedomCAR partnership to develop thermal solutions that apply these technologies. Study results also showed that even with new high temperature materials such as silicon carbide, free convection with air does not appear to provide the heat dissipation rates needed. NREL is therefore developing advanced air cooling technologies to meet the challenge.
Look for the paper in a future issue of IEEE's Vehicular Technology Magazine or contact Michael O'Keefe (303-275-4268) for additional information.
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