The DCC dry cooling coil unit series products that DunAn provides to its customers have adopted advanced processing technology to process traditional round tubes into unique oval tube structure. After years of research, the traditional heat exchangers reached the bottleneck state in terms of heat transfer efficiency. The heat exchanger of traditional circular tube structure has many disadvantages such as high wind resistance and unsatisfactory heat transfer effect, while the oval tube heat exchanger has the remarkable characteristics of low air resistance, high heat exchange efficiency, and high energy saving.