Optimization of heat transfer in an air cooler equipped with classic twisted tape inserts using imperialist competitive algorithm

In this paper a novel optimization algorithm based on Imperialist Competitive Algorithm (ICA) is used to optimize the heat transfer in an air cooled heat exchanger equipped with the classic twisted tape inserts. This algorithm has some advantages such as simplicity, accuracy, and time saving. Experiments included the twist ratio ranging from 1.76 to 3.53. Also, the Reynolds number varied from 4021 to 16,118. After data reduction, the regression equation of average Nusselt number was obtained as a function of Reynolds number and the twist ratio. Then the cost function was optimized by the use of ICA. One can be sure that the Nusselt number will be optimized due to the optimization of the cost function. Computational results indicate that the proposed optimization algorithm is quite effective and powerful in optimizing the cost function. According to the results, in order to obtain maximum heat transfer, the twist ratio must be at the lowest level.