Under the background of copper resource shortage and large air-conditioning production countries, air-conditioning enterprises have sprung up a round of copper substitution technology this year. At present, many air conditioning enterprises such as Zhigao, Kelon and Gree have begun to use copper aluminum connecting pipe instead of pure copper connecting pipe. Midea air conditioner fully opposed the copper aluminum tube and accused the copper aluminum tube of being a "black heart tube", which caused an uproar in the industry.

In recent years, the international price of electrolytic copper has risen from 20000 yuan to 80000 yuan per ton. Accordingly, the proportion of copper pipe in the cost of air conditioning has increased to about 25%. The operating costs of refrigeration products enterprises such as air conditioning have risen sharply, and there is an urgent need to find new alternative materials.

According to Zhao Yue, senior engineer of Ocean University of China, the use of copper aluminum pipe has four advantages: first, the advantages of welding technology: the weld strength of the third generation copper aluminum connecting pipe produced by using the welding technology of thin-walled copper aluminum pipe is higher than that of copper pipe and aluminum pipe; Second, the advantage of service life: the appearance of copper aluminum pipe adopts cross-linked polyethylene for anti-corrosion treatment, and the service life is more than 20 years; Third, energy saving advantages: the use of copper aluminum connecting pipe will be conducive to the insulation of connecting pipe, reduce the waste of cooling capacity and improve the level of energy saving; Fourth, excellent bending performance, easy to install and move.