Numerical analysis of the cooling performance of a totally enclosed air-to-air cooled motor using a dual cell heat exchanger model

摘要

The cooling performance improvement of a heat exchanger was investigated for a totally enclose air-to-air cooled high-voltage induction motor. Using dual cell heat exchanger model, 3D full mesh of the motor was created and the cooling improvement effect of the motor was numerically evaluated according to use of various design factors, such as tubes with 8 internal fins, the number of baffles, and heat exchanger housing that recycles exhaust air. The numerical models were verified through experimental testing. The results show that applying the tubes with internal fins and heat exchanger housing to recycle exhaust air to the motor reduces the average temperature rise in the stator winding by about 2.7 degrees C and 1.2 degrees C, respectively. But increasing the number of baffles in the heat exchanger from one to three increases the average temperature of the stator winding by 3.1 degrees C due to the increased pressure drop across tube banks. We can conclude that air flow resistance analysis of the entire system should be considered and also important on cooling performance in a TEAAC motor with external heat exchanger.