Introduction to the functions and roles of finned heat exchangers.

With the country's new requirements for energy conservation in buildings and residences, some traditional products can no longer meet the needs of the construction market and consumers. For a long time, heating radiators used in buildings and residences, particularly finned radiators, have accounted for the vast majority of usage. The existence of such products inevitably leads to environmental pollution and waste of energy and raw materials. Therefore, it is inevitable that lightweight, high-quality, and decorative radiators will gradually replace cast iron radiators.

With the country's new requirements for energy conservation in buildings and residences, some traditional products can no longer meet the needs of the construction market and consumers. For a long time, radiators used for heating in buildings and residences have predominantly been finned radiators.Finned radiator, which account for the vast majority of usage. The existence of such products inevitably leads to environmental pollution and waste of energy and raw materials. Therefore, it is inevitable that lightweight, high-quality, and decorative radiators will gradually replace cast iron radiators.

In recent years, a new type of heating equipment has emerged in China's heating industry—aluminum alloy radiators. This product is primarily composed of aluminum, magnesium, and silicon alloys, which are heated and extruded into different profiles, then welded together in various combinations. It has many advantages such as being lightweight, good thermal conductivity, high pressure resistance, excellent thermal performance indicators, metal thermal strength above 2.4W/kg0C, and ideal economic efficiency. It has quickly been accepted by society. Especially in the past year, it has developed rapidly from a dozen manufacturers to over 70 aluminum radiator production enterprises. A considerable number of these enterprises have small production scales and their technical processes need further improvement. Currently, most manufacturers have not implemented internal anti-corrosion measures, which will inevitably lead to future problems for the companies. Aluminum finned radiators are mainly used in alkaline water. According to China's heating water quality standards for boiler water treatment, the circulating water at a temperature of 95°C requires a pH of 10 to 12. The alkalinity of boiler water is 8-20 mg equivalent/liter. This regulation is aimed at controlling the oxygen content in the feed water to protect the corrosion of pipes and the boiler body; on the other hand, it converts scaling substances into precipitates, extending the service life of the boiler. Otherwise, if the water quality of the heating system is alkaline, it will far exceed the safe operating conditions of aluminum radiators.

According to the current heating water quality conditions, using aluminum radiators directly without internal anti-corrosion measures can easily lead to early leakage. Of course, if the water quality of the heating system is pH <8, finned radiators will operate under nearly neutral water conditions; however, if the water quality contains excessive chlorides, the presence of Cl has a significant impact on corrosion. This is because chlorides can destroy the protective film on metal surfaces. Moreover, the higher the Cl concentration, the greater the conductivity of the solution, which exacerbates micro-battery effects and accelerates corrosion. Therefore, even in neutral water conditions, it is difficult to conclude that aluminum radiators will never corrode. There is an urgent need to address corrosion and short-term leakage issues with aluminum radiators to extend their service life and promote the development of finned radiators.