Air conditioning is essential to escape the heat in summer. While air conditioning has entered thousands of households, it itself is also developing continuously. At present, air conditioners are gradually developing towards miniaturization, high efficiency and long life. The air conditioning heat exchanger fins are also developing in the direction of ultra-thin and high strength. Air-conditioning foils can be mainly divided into 7 categories according to their processing technology and performance characteristics:
1. Hydrophilic aluminum foil
The surface of hydrophilic aluminum foil has strong hydrophilicity. The quality of the hydrophilic property is determined by the angle formed by water sticking to the surface of the aluminum foil. The smaller the angle a, the better the hydrophilic property, and vice versa. Hydrophilic aluminum foil is generally used on the condenser of air conditioners. Its main function is to make the moisture in the hot air condense into water droplets on the heat exchanger, so that it can easily spread and flow downward along the sheet. This can prevent the ventilation effect of the heat exchanger from being affected by the "bridging" of water droplets between the heat exchange fins, thereby improving the heat exchange rate of the air conditioner and saving electricity under the same cooling capacity. At present, the general hydrophilic aluminum foil on the market not only has good hydrophilicity on the surface, but also has high corrosion resistance, thus making the performance of the air conditioner more optimized.
2. Uncoated aluminum foil
Uncoated aluminum foil refers to aluminum foil that has been rolled and annealed without any form of surface treatment. The aluminum foil used for air conditioning heat exchangers in my country 10 years ago and abroad about 15 years ago were all uncoated aluminum foil. Even now, about 50% of the heat exchange fins used in developed countries abroad are still uncoated aluminum foil, while in our country, this ratio is about 60%.
3. Coated aluminum foil
The so-called coated aluminum foil is to re-process the surface of uncoated aluminum foil to make it have certain special functions. In countries with rapid technological development such as Japan and Germany, coated aluminum foil has been used for more than 15 years. In our country, coated aluminum foil has been used for no more than 10 years.
4. Corrosion-resistant aluminum foil
The surface of the corrosion-resistant aluminum foil product has a certain anti-corrosion protective layer. The air-conditioning heat exchanger made of this product can be used in harsher areas and can significantly extend the service life of the air conditioner. At the same time, due to the improvement of the corrosion resistance of the heat exchange fins, the generation of surface corrosion powder is greatly reduced, thereby improving the ventilation quality and purifying the air in the air-conditioned room.
5. Hydrophobic aluminum foil
Hydrophobic aluminum foil is also called water-repellent aluminum foil, and its surface properties are exactly the opposite of hydrophilic aluminum foil. That is, when the condensed water condenses onto the surface of the aluminum foil, the contact angle with the aluminum foil is relatively large, generally 75. above. The larger the angle, the better the water repellency. The ultimate purpose of using hydrophobic aluminum foil is the same as that of hydrophilic aluminum foil, which is to prevent condensation water from remaining between the heat exchange fins. The difference is that the hydrophobic aluminum foil removes the condensed water between the heat exchange fins by increasing the contact angle between the condensed water and the heat exchange fins, causing the condensed water to form water droplets that are easy to slide off.
6. Self-lubricating aluminum foil
During the processing of air-conditioning heat exchange fins, lubricating oil is generally added to the surface, then punched and flanged, and finally the lubricating oil is washed away with trichlorethylene. Since trichlorethylene is harmful to the human body, in order to reduce this process, self-lubricating aluminum foil was produced accordingly. As the name suggests, self-lubricating aluminum foil does not require separate lubricating oil during its punching process. The lubrication during punching is borne by a pre-treated film on the surface of the aluminum foil. Since there is no need to add special lubricating oil, the subsequent cleaning and drying process of trichlorethylene is omitted.
7. Mildew-proof aluminum foil
Mildew-proof aluminum foil is mainly used in the indoor unit of the air conditioner. Its main function is to prevent the surface mold of the heat exchanger from being used or left for a long time, thereby significantly improving the ventilation quality of the air conditioner and preventing the generation of abnormal odors, effectively Improve the environment in air-conditioned rooms.