THERMAL SCIENCE

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Dardan O. Klimenta

,

Antti Hannukainen

NOVEL APPROACH TO ANALYTICAL MODELLING OF STEADY-STATE HEAT TRANSFER FROM THE EXTERIOR OF TEFC INDUCTION MOTORS

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 to forced 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.
KEYWORDS
Analytical Model, empirical correlation, energy balance, steady-state heat transfer, TEFC induction motor
PAPER SUBMITTED: 2015-06-26
PAPER REVISED: 2016-04-22
PAPER ACCEPTED: 2016-04-22
PUBLISHED ONLINE: 2016-05-08
DOI REFERENCE: https://doi.org/10.2298/TSCI150629091K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 3, PAGES [1529 - 1542]
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Novel approach to analytical modelling of steady-state heat transfer from the exterior of TEFC induction motors

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence