The Investigation Of Heat Transfer Performance For High Efficient Heat Exchange Component In Special-shaped Tube Type And Design Of Experiment

The energy shortage is one of the main problem faced by countries aroundthe world. China is an energy consumption power, what makes the energyshortage problem even more serious. Therefore, the heat exchanger with betterperformance is proposed as higher standards. On the other hand, theimprovement of the heat exchanger also makes the structure more compact,space-saving, and saves land resources. Since the highly efficient heat exchangercomponent is the most important component of the heat exchanger equipment,the core technology of improving the overall performance is the developmentand utilization of highly efficient heat exchanger component. For this reason, thedevelopment of highly efficient heat exchanger component is particularlyimportant.Firstly, on the basis of existing research results, a new type of asymmetricgrooved tube, high efficiency heat exchanger component, has been devised inaccordance with the mandate of the subject requirements. This paper has putforward a scientific evaluation criteria used to evaluate the comprehensive heattransfer performance of heat exchanger component. Under the conditions of hightemperature and pressure, flows and heat transfer within the tube have beencomputed using k-ε turbulence model with helium as working medium.The resultshows that the comprehensive heat transfer performance of asymmetric groovedtube is superior to the traditional symmetric grooved tube.Subsequently, which combines the results of numerical simulation, usingthe Central Composite Design (CCD), the basic structural parameters ofasymmetric grooved tube (groove pitch p, width b, and depth e) has beenoptimized, and the impact of the different structural parameters on heat transferperformance, drag performance, and comprehensive heat transfer performancehas been investigated, where the inner mechanism is preliminary discussed. Theresult shows that the optimal parameters are p12-b8-e0.6.In addition, the flows and heat transfer on the shell side of asymmetricgrooved tube has been studied using LES in this paper. The heat transferenhancement mechanism of asymmetric structure on the shell side has beendiscussed. And the changes of flows and heat transfer on the shell with differentgroove depth has been compared. The optimizing depth is0.6mm, due to thevelocity and temperature field have good coordination, which has verified theaccuracy of the previously calculation.Considering the actual engineering application problems, it needs to test the high efficiency heat exchanger component. Experimental parameters have beencomputed using equal Reynolds number method base on the similarity criterion.The design and testing plan of the experiment have been complet ed. In addition,according to the actual objective conditions of the laboratory, a reasonablelayout of the experimental system has been proposed. Finally, combined with thepreviously proposed design and testing plan, it has selected the equipment andgiven an effective test platform building plan for the highly efficient heatexchanger components.