Novel approach to analytical modelling of steady-state heat transfer from the exterior of TEFC induction motors

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017
Major/Subject
Mcode
Degree programme
Language
en
Pages
14
1529-1542
Series
Thermal Science, Volume 21, issue 3
Abstract
The purpose of this paper is to propose a novel approach to analytical modelling of steady-state heat transfer from the exterior of totally enclosed fan-cooled induction motors. The proposed approach is based on the geometry simplification methods, energy balance equation, modified correlations for forced convection, the Stefan-Boltzmann law, air-flow velocity profiles, and turbulence factor models. To apply modified correlations for forced convection, the motor exterior is presented with surfaces of elementary 3-D shapes as well as the air-flow velocity profiles and turbulence factor models are introduced. The existing correlations for forced convection from a short horizontal cylinder and correlations for heat transfer from straight fins (as well as inter-fin surfaces) in axial air-flows are modified by introducing the Prandtl number to the appropriate power. The correlations for forced convection from straight fins and inter-fin surfaces are derived from the existing ones for combined heat transfer (due toforced convection and radiation) by using the forced-convection correlations for a single flat plate. Employing the proposed analytical approach, satisfactory agreement is obtained with experimental data from other studies.
Description
Keywords
Analytical model, Empirical correlation, Energy balance, Steady-state heat transfer, Totally enclosed fan-cooled induction motor
Other note
Citation
Klimenta , D O & Hannukainen , A 2017 , ' Novel approach to analytical modelling of steady-state heat transfer from the exterior of TEFC induction motors ' , Thermal Science , vol. 21 , no. 3 , pp. 1529-1542 . https://doi.org/10.2298/TSCI150629091K