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

다국어 초록 (Multilingual Abstract)

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 °C and 1.2 °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 °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.

참고문헌 (Reference)

1 S. Nategh, "Thermal modeling of directly cooled electric machines using lumped parameter and limited CFD analysis" 28 (28): 979-990, 2013

2 Y. Yang, "Thermal management of electric machines" 7 (7): 104-116, 2016

3 J. Nerg, "Thermal analysis of radialflux electrical machines with a high power density" 55 (55): 3543-3554, 2008

4 E. Ozden, "Shell side CFD analysis of a small shelland-tube heat exchanger" 51 (51): 1004-1014, 2010

5 S. Manoharan, "Review on efficiency improvement in squirrel cage induction motor by using DCR technology" 60 (60): 227-236, 2009

6 F. J. T. E. Ferreira, "Reliability and operation of high-efficiency induction motors" IEEE 1-13, 2015

7 A. H. Bonnett, "Operating temperature considerations and performance characteristics for IEEE 841 motors" 37 (37): 1120-1131, 2001

8 W. Wang, "Numerical study on hydrodynamic characteristics of plate-fin heat exchanger using porous media approach" 61 : 30-37, 2014

9 Meng Yuan, "Numerical study of hydrodynamic and thermodynamic characteristics of a heat exchanger muffler" 대한기계학회 33 (33): 5515-5525, 2019

10 J. Wen, "Numerical analysis of the external wind path for medium-size high-voltage asynchronous motors" 90 : 869-878, 2015

11 S. V Patankar, "Numerical Heat Transfer and Fluid Flow" Hemisphere Publ, Corp 58-, 1980

12 W. R. Finley, "Noise in induction motors-causes and treatments" 27 (27): 1204-1213, 1991

13 A. De Almeida, "New technology trends and policy needs in energy efficient motor systems - A major opportunity for energy and carbon savings" 115 : 109384-, 2019

14 T. Nakahama, "Improved cooling performance of large motors using fans" 21 (21): 324-331, 2006

15 IEEE Power Engineering Society, "IEEE Standard Test Procedure for Polyphase Induction Motors and Generators" IEEE 2004

16 Y. Xu, "Heat transfer characteristics of external ventilated path in compact high-voltage motor" 124 : 1136-1146, 2018

17 Y. A. Cengel, "Heat Transfer: A Practical Approach" McGraw-Hill 2020

18 S. La Rocca, "Fluid flow and heat transfer analysis of TEFC machine end regions using more realistic end-winding geometry" 2019 (2019): 3831-3835, 2019

19 A. Boglietti, "Evolution and modern approaches for thermal analysis of electrical machines" 56 (56): 871-882, 2009

20 M. K. Yoon, "Efficiency increase of an induction motor by improving cooling performance" 17 (17): 1-6, 2002

21 H. Li, "Effect of baffle spacing on pressure drop and local heat transfer in shell-and-tube heat exchangers for staggered tube arrangement" 41 (41): 1303-1311, 1998

22 X. Yu, "Design analysis and improvement of cooler in positive-pressure explosion-proof low-speed highcapacity induction motors" 129 : 1002-1009, 2018

23 A. Nakayama, "Applications of the volume averaging theory to momentum and heat transfer within complex flow systems" 11 (11): 1-30, 2012

24 K. Dabala, "Analysis of mechanical losses in three-phase squirrel-cage induction motors" IEEE 39-42, 2001

25 C. C. Chang, "Air cooling for a large-scale motor" 30 (30): 1360-1368, 2010

26 I. ANSYS, "ANSYS FLUENT Theory Guide: Release 190"

27 P. S. Yang, "A study on improvement of electic motor thermal performance using CFD" The Korean Society of Mechanical Engineers 261-265, 2003