The air heat exchanger strengthens the heating air through the fin tube to improve the thermal efficiency. The air side heat transfer coefficient and resistance characteristics of air heat exchangers with different fins are different. What are the factors affecting the heat transfer rate of the air heat exchanger in the form of finned tube fins? Let's take a look at the fin form of the air heat exchanger.

The air side heat transfer coefficient and resistance characteristics of air heat exchangers with different fins are different. A large number of experiments have found that the friction increases inevitably while obtaining good heat exchange characteristics. Given the size of the heat exchanger and the operating curve of the fan, the increase of pressure loss will inevitably result in the decrease of air velocity and the temperature difference between the air and the fin wall.



Fin form of air heat exchanger:

1. extruded aluminum fins

The finned tube, in the form of base tube sleeve aluminum tube, (base tube can be used carbon steel, stainless steel, copper) by machine extrusion, forming fins, the fin base and the outer wall of the tube closely, high heat transfer coefficient, excellent heat transfer performance.

2. wound tube fin tube

The finned tube is in the form of a tube winding steel strip, and the steel strip can be (copper, aluminum, carbon steel, stainless steel). This kind of finned tube is suitable for various types, such as stainless steel pipe winding, which can be applied to occasions with high quality requirements. The disadvantage is that the steel strip does not completely adhere to the outer wall of the tube, but is forced to stand upright on the surface of the tube, and the heat transfer coefficient is slightly lower.

3. high frequency welded pipe

This kind of finned tube, mostly used for 10-219mm diameter basal tube, is the fin, using the principle of high-frequency welding, welding on the surface of the tube. This kind of finned tube has high heat transfer coefficient, high fin thickness, stronger than other finned tube, fin is relatively difficult to damage. Long service life and good effect.