Air conditioning is essential to summer, in the air conditioning into thousands of households at the same time, its own is developing. At present, air conditioning is gradually miniaturization, high efficiency, high life direction development. And the air conditioning heat exchanger is also developing to ultra-thin and high strength direction. In the 1980s, the thickness of the heat exchanger sheet was 0.15 — 0.2 RAM, but today the thickness is only 0.09 to 0.15mm. In order to improve the life of air conditioning, reduce power consumption, improve ventilation quality and improve refrigeration effect, and a variety of functions of the hot sheet. Air conditioning aluminum foil can be divided into 7 categories according to its processing technology and performance characteristics:
Uncoated aluminum foil refers to aluminum foil annealed by rolling without any form of surface treatment. China in 10 years ago, foreign about 15 years ago for air conditioning heat exchanger aluminum foil are non-coating aluminum foil. Even at present, about 50% of the heat exchanger pieces used in foreign developed countries are still uncoated aluminum foil, while in China, this ratio is about 60%.
The so-called coated aluminum foil is the surface of the uncoated aluminum foil retreatment, so that it has a special function. In Japan, Germany and other countries with rapid technological development, coated aluminum foil has been used for more than 15 years. In China, the use of coated aluminum foil time is not more than 10 years ago, the general hydrophilic aluminum foil on the market in addition to the surface has a good hydrophilic, but also has high corrosion resistance, so that the performance of air conditioning is more optimized.
Hydrophobic aluminum foil is also called hydrophobic aluminum foil, its surface corrosion resistant aluminum foil corrosion resistant aluminum foil product surface has a certain corrosion resistant protective layer, the product made of air conditioning heat exchanger can be applied to the more harsh areas, and can significantly improve the service life of air conditioning. At the same time, due to the improvement of corrosion resistance of heat exchanger sheet, the formation of surface corrosion powder is greatly reduced, so as to improve the ventilation quality and purify the air in the air conditioning room.
Hydrophilic aluminum foil surface has a strong hydrophilic. The hydrophilicity is determined by the Angle formed by water sticking to the surface of aluminum foil. The smaller the A Angle is, the better the hydrophilicity is; otherwise, the worse the hydrophilicity is. In general, Angle A is less than 35. That’s hydrophilic. Hydrophilic aluminum foil is generally used in air conditioning condensers. Its main function is to make the water in the hot air condense into water droplets on the heat exchanger sheet and easy to spread and flow down the sheet. In this way, the ventilation effect of heat exchanger can be avoided because of the water droplets “bridge” between the heat exchanger, so as to improve the heat exchange rate of air conditioning, and can save electric energy under the condition of the same cooling capacity. The mesh performance and hydrophilic aluminum foil is just the opposite. That is, the contact Angle between the condensation water and the aluminum foil surface is larger, generally at 75. The above. The greater the Angle, the better the water repellency. The ultimate purpose of using hydrophobic aluminum foil is the same as hydrophilic aluminum foil, that is, do not let the condensed water stay between the heat exchanger pieces. The difference is that detest water aluminum foil is by increasing the contact Angle of condensate water and heat exchange piece, so that condensate water form easy to slip water droplets to achieve the purpose of removing heat exchange piece condensate water.
Air conditioning heat exchanger in the process of processing and production generally add lubricating oil on its surface, and then punch and flanging, and then use trichloethylene to wash the lubricating oil. Because trichloroethylene is harmful to human health, in order to reduce this process, the corresponding generation of self-lubricating aluminum foil. Self-lubricating aluminum foil as the name implies, is in its punching processing does not need to add lubricating oil alone, its punching lubrication by the aluminum foil surface pre-treated film to bear. Since special lubricating oil is not required, subsequent trichloroethylene cleaning and drying processes are eliminated.
Mildew proof aluminum foil is mainly used in the indoor unit part of air conditioning, its main function is to prevent heat exchanger due to use or placed for a long time and produce surface mildew, so as to significantly improve the ventilation quality of air conditioning, prevent abnormal odor, effectively improve the indoor environment of air conditioning.
