Air conditioning has become an essential part of summer, especially during the vacation season. As air conditioners have entered millions of homes, they have also evolved significantly. Today, air conditioning systems are gradually moving towards miniaturization, higher performance, and longer lifespan. This development has also influenced the design of air conditioning heat exchangers, which are now being produced with ultra-thin and high-strength aluminum sheets.
In the 1980s, the thickness of heat exchange sheets was between 0.15 to 0.2 mm. Nowadays, it has been reduced to just 0.09 to 0.15 mm. To enhance the durability, reduce energy consumption, improve airflow quality, and boost cooling efficiency, various types of aluminum foils have been developed for air conditioning applications. These foils can be classified into seven main categories based on their processing techniques and performance characteristics:
1. **Non-coated Aluminum Foil**
This type of foil is produced by rolling and annealing without any surface treatment. In China, about 60% of heat exchange films still use non-coated aluminum foil today, while in developed countries, around 50% of such materials are still used. It was widely used in the air conditioning industry over 15 years ago.
2. **Coated Aluminum Foil**
Coated aluminum foil is made by applying a surface treatment to non-coated foil to give it special properties. Countries like Japan and Germany have been using this type for over 15 years, while in China, its usage is less than a decade.
3. **Corrosion-Resistant Aluminum Foil**
This type features a protective layer that enhances resistance to corrosion. It is ideal for harsh environments and helps extend the life of air conditioners. It also reduces the formation of corrosion powder, improving indoor air quality and ventilation efficiency.
4. **Hydrophilic Aluminum Foil**
Hydrophilic aluminum foil has a strong affinity for water. The hydrophilicity is measured by the contact angle of water droplets on its surface. A smaller angle indicates better hydrophilicity, typically below 35 degrees. This type is commonly used in condensers, helping condensation spread evenly and drain efficiently, thus improving heat exchange efficiency and reducing energy consumption.
5. **Hydrophobic Aluminum Foil**
Unlike hydrophilic foil, hydrophobic aluminum foil repels water. Its contact angle is generally above 75 degrees, making it ideal for situations where quick drainage is needed. It helps prevent water from accumulating between heat exchange fins, ensuring efficient airflow and cooling.
6. **Self-Lubricating Aluminum Foil**
Traditional processing involves applying lubricants before punching, followed by cleaning with trichloroethylene, which is harmful. Self-lubricating aluminum foil eliminates this step by pre-treating the surface, reducing environmental impact and simplifying the manufacturing process.
7. **Mold-Resistant Aluminum Foil**
Primarily used in indoor units, mold-resistant aluminum foil prevents the growth of mold on heat exchange surfaces due to long-term storage or use. This improves air quality and reduces unpleasant odors, creating a more comfortable living environment.
These advancements in aluminum foil technology have played a key role in enhancing the efficiency, durability, and user experience of modern air conditioning systems.
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