Heat balance analysis of 7kW fast axial flow CO_2 laser and design of the heat exchanger

In order to overcome the main issue in the design of high power fast axial flow CO_2 lasers, i. e., cleanup of the heat in the active region, considering the inner heat cycle and characteristics of the 7kW fast axial flow CO_2 laser, the heat balance equation was established with convective cooling method. Meanwhile, in view of the big thermal load quantity, the whole structure limitation and the specific turbo blower of the high power laser, comparing various types of heat exchangers, the rectangle fin circle tube heat exchanger was chosen as the laser's radiator in light of the prominent heat transfer capacity and compact structure. Further more designed the heat exchanger and calculated the heat conducting for the 7kW laser. The quantity of heat exchange is 37.4kW. The results indicate that the rectangle fin circle tube heat exchanger is suitable to the fast axial flow CO_2 laser.