The author used CFD software to simulate when group panel-type radiator quantity, space, height of gooseneck have changed, how temperature distribute on the radiator. To obtain when group panel-type radiator quantity, space, height of gooseneck and other factors have changed, the laws of heat transfer efficiency changed and analyzed the reasons for emergence of such laws in theory. The optimal group of panel-type radiator improvement program is explored, to provide guidance for the practical application of engineering.

With the development of the extremely high level voltage grid, such as Shanghai, Hangzhou and so on. There are more and more factories and AC-DC converter substations are involved into the city's region, which causes much more power quality problems than before, so that many people begin to focused on the power supply. In this article, we analyzed some evaluation methods for power quality estimation, then we make a deep study about the characteristics in power supply for urban region and AC-DC converter substations. With the construction work of harmonic monitoring platform of State Grid, we can handle a real-time judgment for power supply substation. At last, we put forward a power quality estimate method for AC-DC converter substations. The method is based on the power quality parameters of power supply in AC-DC, it is established from four elements, which are: related harmonic voltage, related harmonic current, related power and voltage change, all these elements constitute a method to estimate the power quality of AC-DC converter substations. In the final, the result can be shown by a single figure, which includes all the related elements.