What are the types of aluminum foil used for air conditioning?
Uncoated aluminum foil
Uncoated aluminum foil is aluminum foil that has been rolled and annealed without any form of surface treatment.
The aluminum foil used for air conditioning heat exchangers in China 10 years ago and abroad about 15 years ago are non-coated aluminum foil.
About 50% of the heat exchangers used in developed countries abroad are still non-coated aluminum foil, while in our country, the ratio is around 60%.
Coated aluminum foil
The so-called coated aluminum foil is the surface reprocessing of non-coated aluminum foil to make it have some special function.
In Japan, Germany and other countries with faster technology development, the use of coated aluminum foil has a history of more than 15 years. In China, coated aluminum foil has been used for no more than 10 years.
According to the characteristics possessed by the surface of coated aluminum foil, it can be further classified as follows.
- Corrosion-resistant aluminum foil
The surface of corrosion-resistant aluminum foil products has a certain corrosion-resistant protective layer, and the air conditioner heat exchanger made of this product can be applied to more severe areas and can significantly improve the service life of the air conditioner.
At the same time, due to the improvement of the corrosion resistance of the heat exchanger, the generation of surface corrosion powder is greatly reduced, thus improving the quality of ventilation and purifying the air inside the air conditioner.
- Hydrophilic aluminum foil
Hydrophilic aluminum foil surface has a strong hydrophilic.
The hydrophilic performance is determined by the size of the angle formed after the water sticks to the surface of the aluminum foil. the smaller the an angle, the better the hydrophilic performance, and vice versa, the worse the hydrophilic performance. Generally speaking, a-angle is less than 35, which is hydrophilic.
Hydrophilic aluminum foil is generally used in the evaporator of air conditioners. Its main function is to make the moisture in the hot air condense into water droplets on the heat exchanger easily spread out and flow down the sheet. This can avoid the water beads between the heat exchanger sheet “bridge” and affect the ventilation effect of the heat exchanger, thus improving the heat exchange rate of the air conditioner, in the same conditions of cooling capacity can also save electricity.
Before, the general hydrophilic aluminum foil on the market has a good hydrophilic surface, but also has a high corrosion resistance, so that the performance of the air conditioner is more optimized.
- Water-repellent aluminum foil
The Water-repellent aluminum foil has the opposite surface performance of hydrophilic aluminum foil. That is, condensate condensation to the surface of the aluminum foil and the aluminum foil into a larger contact angle, generally in the 75. above. The larger the angle, the better the water repellent performance.
The ultimate purpose of using water-repellent aluminum foil is the same as hydrophilic aluminum foil, i.e. not to let condensate stay between the heat exchangers.
The difference is that the water-repellent aluminum foil is to increase the contact angle between the condensate and the heat exchanger, so that the condensate forms water droplets that are easy to slip off and achieve the purpose of removing the condensate between the heat exchanger.
- Self-lubricating aluminum foil
The air conditioner heat exchanger sheet is generally processed and produced by adding lubricant to its surface first, then punching and turning the edge, and finally washing away the lubricant with [trichloroethylene]. Since trichloroethylene is harmful to humans, self-lubricating aluminum foil was created to reduce this process.
Self-lubricating aluminum foil, as its name implies, does not require separate lubrication during its punching process; the lubrication during punching is carried out by a pre-treated film on the surface of the foil. Since there is no need to add lubricating oil, the subsequent trichloroethylene cleaning and drying process is also eliminated.
The main function of anti-mildew aluminum foil is to prevent the surface of the heat exchanger from becoming mildewed due to the use or placement for a long time, thus obviously improving the ventilation quality of the air conditioner, preventing the generation of abnormal odor and effectively improving the indoor environment of the air conditioner.