Significance of radiation heat transfer on cooling performance of transformer radiator

Sa？etak The article demonstrate significance of radiation heat transfer on cooling performance of radiators used in power transformers with air natural cooling configuration using analytical calculations and computional fluid dynamics simulations on two different case studies. Convective and radiative heat transfer mechanisms are modelled on a single radiator and a good agreement with the experimental measurement results is observed. The radiation contributes 21.3 % of total heat dissipation and thus has a significant impact on overall heat dissipation and cannot be neglected. This study will be useful – for the transformer designer – to point on the relevance of the radiative heat transfer in cooling