Effect of fan arrangement and air flow direction on thermal performance of radiators in a power transformer

Sachin B. Paramane, Wim Van der Veken, Atul Sharma, Joris Coddé


The focus of the present numerical work is to study the effect of fan air flow direction and mounting arrangement on the thermal
performance of the radiators of power transformers using Computational Fluid Dynamics analysis. The study is carried out
for four radiators of 3 m height and 30 fins with 0.52 m width and two fans of 1 m diameter in vertical and horizontal air
flow directions. The horizontal flows from the two fans are considered in the same and the opposite direction, with the fans
located on the same and the opposite side, respectively running at the same speed of 860 rpm for all configurations. Thermal
radiation is modelled using the discrete transfer radiation model. A comparison of different flow and heat transfer patterns as
well as heat dissipation—for the four different configurations—is presented. Velocity and temperature contours are used to
visualize the heat and fluid flow distribution over the radiators. Fans placed on one side of the radiators result in larger heat
dissipation than the other arrangements studied. The reasons for the improvement in heat dissipation are presented.


radiators, fan arrangement, cross flow, heat dissipation, CFD, flow distribution, transformer cooling

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C.-H. Cha, J.-K. Kim, K.-Y. Kweon, Investigation of the thermal head

effect in a power transformer, in: Transmission & Distribution Conference

& Exposition: Asia and Pacific, 2009, IEEE, 2009, pp. 1–4.

H. Nabati, J. Mahmoudi, A. Ehteram, Heat transfer and fluid flow analysis

of power transformer’s cooling system using cfd approach, Chemical

Product and Process Modeling 4 (1) (2009) 1934–2659.

E. I. Amoiralis, P. S. Georgilakis, M. A. Tsili, A. G. Kladas, Global

transformer optimization method using evolutionary design and numerical

field computation, Magnetics, IEEE Transactions on 45 (3) (2009)


R. B. Fdhila, E. Kranenborg, T. Laneryd, C.-O. Olsson, B. Samuelsson,

A. Gustafsson, L. Lundin, Thermal modeling of power transformer radiators

using a porous medium based cfd approach, in: Second International

Conference on Computational Methods for Thermal Problems,

Dalian, China, 2011.

J. Gastelurrutia, J. C. Ramos, G. S. Larraona, A. Rivas, J. Izagirre,

L. Del Río, Numerical modelling of natural convection of oil inside distribution

transformers, Applied Thermal Engineering 31 (4) (2011) 493–

C. Olsson, Buoyancy driven flow in counter flow heat exchangers, in:

th European Thermal Sciences Conference, Poitiers, France, 2012,

pp. 1–8.

M.-g. Kim, S. M. Cho, J.-K. Kim, Prediction and evaluation of the cooling

performance of radiators used in oil-filled power transformer applications

with non-direct and direct-oil-forced flow, Experimental Thermal

and Fluid Science 44 (2013) 392–397.

S. B. Paramane, K. Joshi, W. Van der Veken, A. Sharma, Cfd study

on thermal performance of radiators in a power transformer: Effect of

blowing direction and offset of fans, Power Delivery, IEEE Transactions

on 29 (6) (2014) 2596–2604.

W. Van der Veken, S. Paramane, R. Mertens, V. Chandak, J. Codde,

Increased efficiency of thermal calculations via the development of a

full thermohydraulic radiator model, IEEE Transactions on Power DeliveryAccepted

for publication.

ANSYS 2009. CFX manual. Theory. Version 12.1.

T. Zitzmann, P. Pfrommer, M. Cook, Dynamic thermal building analysis

with cfd–modelling radiation, Proceedings: Building Simulation,

Beijing, China (2007) 31–38.


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