First, copper and aluminum composite radiator, copper and aluminum composite radiator background. Extruded aluminum die-cast aluminum airfoil radiator central heating hot water system can not adapt to the widely used in China, because it is most afraid of alkaline water corrosion. Rather the steel radiator afraid of acidic water corrosion. To solve this problem, within the anti-corrosion the intracavity paint or chemical plating method, can not effectively check the lumen of quality, reliability being questioned, so in the late nineties led some CHUNGHOP to Beijing and Tianjin Cathay Pacific manufacturers began the development of the full copper waterways aluminum composite radiator. 2, the technical requirements for copper and aluminum composite radiator. By many copper risers with the upper and lower header cross pipe welded riser coat aluminum profiles by high-pressure liquid up the tube closely combined into one, and they constitute a full copper waterways copper and aluminum composite airfoil radiator. According to the People's Republic of China Building Industry Standard JG220-2007 copper and aluminum composite airfoil radiator, copper and aluminum composite radiator must meet the following two points First riser must be inserted into the aluminum inner cavity, using hydraulic up access technology, copper tube expansion, the two closely combined into one, there is no gap in the middle, the thermal resistance between the two is negligible. No card slot connection or other can not both close connection composite one; the brass material must tensile brass is of TP2 or TU2 squeeze rolling. TP2 or TU2 are pure copper, was purple, also known as copper. TU2 for oxygen-free copper, high purity, is mainly used for vacuum devices, TP2 phosphorus deoxidized copper, multi-pipe supply, mainly used in condensers, evaporators, heat exchangers, heat exchanger parts. Shall not be used with high copper content brass (alloy of copper), strong hardness, not easy then and aluminum up into one, two brass copper corrosion. 3, copper and aluminum composite radiator features. (1) the broad scope of application, no strict requirements on water quality, regardless of the open-closed system, without full water maintenance; (2) The body is compact, easy to clean, long service life, it is completely in line with the national standard GB50096-1999 "Residential Design Code "radiator only three requirements, is in line with China's national conditions, suitable for household heat metering, suitable for high-rise buildings, suitable for any water quality assured products; (3) copper and aluminum thermal conductivity, copper corrosion The colorful modeling of aluminum profiles, copper and aluminum composite, complementary advantages, combined into a lightweight, efficient, and materials, energy-efficient, attractive, durable, environmentally friendly product. 4, on the coefficient of expansion of copper and aluminum, and the thermal contact resistance. Individual production of aluminum radiators market manufacturers for their own gain, distortion of the facts, attack, copper and aluminum composite radiator expansion coefficient of copper and aluminum, a long time, the intermediate gap will produce thermal resistance . This is simply nonsense. First copper and aluminum composite radiator into the market from the late nineties has long been used for 10 years, so far have not adopted the hydraulic rose then copper and aluminum composite radiator cooling effect over time increasingly the worse the situation, otherwise production of copper and aluminum composite radiator manufacturers has long been discontinued, and will not appear to the country now are mainly copper and aluminum composite radiator, copper and aluminum composite radiator absolute majority of market share situation. In fact, relative to the steel and aluminum, magnesium and aluminum, the coefficient of expansion of copper and aluminum is the closest, and therefore, the copper-aluminum composite is relatively speaking the best. And during the winter heating, water heating system as a whole is always high temperatures, and will not appear sometimes hot and sometimes cold, and therefore not a phenomenon some manufacturers attacks, brass and aluminum due to thermal expansion and contraction or resonance, the gap will be increasing, the thermal resistance is increasing and decreasing heat dissipation due to the use of time increments. St. Lawrence radiator Ten brand Inquiries Contact: Taoze Feng Tel :010-87,598,438 QQ: 860 357 491 steel radiator: http:// nuanqipian1.zk71.com / radiator: http://www.sllssrq.com/ heating is not: http://www.nuanqi.cc/?article-54.html Daxing District, Beijing 1201 Crystal Square Huatang Mall,