Structural Optimization And Heat Transfer Performance Of The Closed-air Cooler

Closed air cooler has become an important heat exchanger equipment and has been widely used in various fields, because of its conservation of energy and water. Generalized the research development and latest results about thermal performance of Closed air cooler, this paper is primarily made on the optimization of fin's dimensions with combination of different air convection coefficient.This paper analyse the relationship between efficency of the fin and volume of fin, analyse the enhanced efficiency of fins between defferent the ratio of fin height and fin thickness, and optimize the fin dimensions convection at different operating conditions corresponding.①Strengthening the efficiency of fin increases with the increase of fin volume. The more the tin thinner, the more increase rate of enhanced efficiency increases with the increase of fin volume.②The effect of fin strengthen is the best, when height thickness ratio of fin is 30.③by using the MATLAB software, when the fin heat transfer three times the heat transfer tubes, obtained the solution between the fin height and the convective heat transfer coefficient using interpolationthe numerical. And then, fitted the relationship between heat transfer coefficient and height of fin ,when three times the efficiency in value enhancement.④When fin heat transfer coefficient between 20.0 to 50.0 ( )2W m ? K, using fin thickness is 0.5mm, fin height is 17.3mm, the effect of fin strengthen is the best. At this time height thickness ratio of fin is 34.6. When fin heat transfer coefficient between 50.0 to 93.3 ( )2W m ? K, using fin thickness is 1.0mm, fin height is 30.0mm, the effect of fin strengthen is the best. At this time height thickness ratio of fin is 30.0 . When fin heat transfer coefficient between 93.3 to 100.0 ( )2W m ? K, using fin thickness is 2.0mm, fin height is 60.0mm, the effect of fin strengthen is the best. At this time height thickness ratio of fin is 30.0.⑤And when the fin thickess Greater than 2.0mm, the effect of fin strengthen have no effection.In this paper, simulating by ANSYS software, set up, analyzed and compared five solid model based on aLow Fin, Hi Fin and the results of optimization in different operating conditions. The results shows that the optimal effection is obvious, which is based on the model by the three groups corresponding to three groups conditions, and end surface temperature of fin reduce with the increase of convective heat transfer enhancement factor gradually.