An Evaluation of Liquid and Two-Phase Cooling Techniques for Use in Electrical Machinery.
Final rept. 1 Oct 83-30 Sep 84,
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The advantages that can be achieved through the use of advanced techniques for cooling of electric machinery are discussed. A brief literature survey is presented on liquid cooling of rotating machinery, where the liquid is in off-axis rotation. The lack of models to adequately predict pressure drop and heat-transfer performance in this situation has been noted. The use of heat-pipe cooling appears to be superior to liquid cooling techniques, which require rotating seals with questionable reliability. A detailed literature survey is presented to reveal the advancement achieved through the use of heat-pipe cooling of electric motors. Heat pipes have been successfully used to cool electric motors, resulting in lower and nearly uniform temperatures in rotors and stators. Heat-pipe cooling has been demonstrated to increase the power-to-weight ratio of electric motors by 50 percent or more. In addition, up to 10 percent increase in efficiency has been reported in the literature.
- Air Conditioning, Heating, Lighting and Ventilating