The air heat exchanger strengthens the heating of air through finned tubes to improve thermal efficiency. Air heat exchangers with different fin forms have different air side heat transfer coefficients and resistance characteristics.

So what are the factors affecting the heat transfer rate of the finned tube fin form on the air heat exchanger? Let’s take a look at the fin form of the air heat exchanger.

Air heat exchangers with different fin forms have different air side heat transfer coefficients and resistance characteristics.

A large number of experiments have found that while obtaining good heat exchange characteristics, the increase of friction is inevitable.

Under a given heat exchanger size and fan operating curve, an increase in pressure loss will inevitably result in a decrease in air velocity, which in turn reduces the heat transfer temperature difference between the air and the fin wall.

Fin form of air heat exchanger:

1. Extruded aluminum fins

The finned tube is in the form of a base tube covered with an aluminum tube. (The base tube can be carbon steel, stainless steel, copper) is extruded by a machine to form a fin.

The base of the fin is closely attached to the outer wall of the tube, and the heat transfer coefficient is high. , excellent heat transfer performance.

2. Wound tube finned tube

The finned tubes are in the form of a base tube wound with a strip of steel (copper, aluminium, carbon steel, stainless steel).

This kind of finned tube is suitable for various types, such as stainless steel coiled tube, 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 base pipe, but stands upright on the surface of the base pipe under force, and the heat transfer coefficient is slightly low.

3. High frequency welded pipe

This type of finned tube is mostly used for base tubes with a diameter of 10-219mm. The fins are welded to the surface of the base tube using the principle of high-frequency welding.

This type of finned tube has high heat transfer coefficient and high fin thickness. Compared with other finned tubes, it is stronger and the fins are relatively less prone to damage. Long service life and good effect.