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The cooling system is a key factor in power transformer designs. The frequentneed for optimized projects further increases the importance of developmentthrough of increasingly developed tools. This work aims to evaluate atransformer design, in which the refrigeration is performed through of exhaustfans and heat exchangers installed on the lower side of the transformer. Themodel is elaborated applying a symmetry, reducing the model to be analyzed. Inorder to evaluate the best configuration in terms of positioning, flow rate andquantity of understand the main thermal and fluid dynamics characteristics ofthe flow inside the transformer, the Computational Fluid Dynamics tool is used.The methodology employed is to solve the numerically, through the ANSYS CFXcomputational package, the flow and energy equations inside the transformertank.

An\'alise t\'ermica\-fluidodin\^amica de um transformador de energia a seco atrav\'es da din\^amica dos fluidos computacional