Gas water heater tank "fight copper and aluminum," fueling controversy
Market set off widespread controversy in the gas water heater tank materials from the "aluminum" instead of "copper", will the recent new developments have emerged. Individual water heaters currently on the market used by enterprises, "pure copper water tank"
HC HVAC Network Chinese Hardware Products Association, the first time related to the recent gas
Water heater Industry staged a "battle of copper aluminum Generation" to the public expressed their views on the matter, to encourage business innovation, I hope other companies do not make improper comments, to jointly create a water heater industry, health
Ecological Environment . Recent years, some companies in the market to reflect the price competitiveness of products, still water heater products, extensive use of "lead and copper leaching" tank. Meanwhile, in the end the promotion and
Sell The process is not clear to consumers the "Baptist Lead and Copper" or "oxygen-free copper," but fuzzy concept, unity of "copper water tank" to mislead the audience.
Million and brand management group, said the Minister of benzyl chloride, aluminum, copper technology is not simply on behalf of lower costs, this is actually 10000 and with Hisense Kelon, Xi'an Jiaotong University, will be launched early in 2007, a comprehensive technical innovations , and patented. Hui-Zhen Li, at present the application of this new material to market gas water heater has a few months, very good market feedback. As a result of new materials, products, market prices are competitive.
Dip galvanized copper technology started in the early 80s of last century, due to relatively simple production technology, product material cost is relatively low, the production technology still in use. Stirred widespread controversy in the market, the gas water heater tank materials from the "aluminum" instead of "copper", will the recent new developments have emerged. Individual water heaters currently on the market used by enterprises, "pure copper water tank," and vigorously engaged in the stores, "pure copper" tank show, in fact most of the use of a "Baptist Lead and Copper", not pure copper. "Baptist Lead and Copper" production process has been in Europe and the United States and other developed countries is strictly prohibits the use, in our country also belongs to backward technology, phased out. "Lead and Copper dip" tank welding method is to immerse the lead content of copper up to 95% of high-temperature tin alloy solution, to be
Cooling Formed after the solidification. Some enterprises to avoid the lead, known as "dip tin copper," in fact essentially the same. An industry that the use of "dip galvanized copper" made of water tanks, tin content of about 15%, there can not be called true copper.
National Gas Appliance Product Quality Supervision and Inspection Center (Foshan) tests Minister ZHANG Ming-wei told reporters on the market sold the gas water heater in the "Copper" water tank, the main use of "oxygen-free copper" and the "dip lead and copper," the two kind of technology. However, only the "oxygen-free copper" closest to pure copper, copper content of up to 99%, without the use of lead solder, but the relatively high cost of manufacturing and technology.
Some enterprises in order to promote sales, upset the market competition, have been reported by insiders, and other means of exposing shady operation, publicly questioned the aluminum alloy gas water heater. A Tsinghua University professor of engineering materials, told reporters, speaking from the thermal conductivity, preferably copper, aluminum and better lead the worst, "the Baptist lead and copper," As the copper in the molten lead will be immersed in liquid to form a curing effect , thermal conductivity copper completely covered by the package lead, not play not a good thermal conductivity of copper.
Present, the national standard gas water heater products, the requirements on the melting point of 500 degrees. The "Lead and Copper dip" in the highest melting point of lead less than 350 degrees, but the melting point of aluminum alloy is as high as 700 degrees.
Gas water heater tank, "Copper and Aluminum dispute" event trigger a market dispute, in an interview on the technical experts understand, "copper and aluminum dispute" is indeed the essence of "Baptist Lead and Copper" and "Al" of the competition. Experts pointed out that the leaching lead and copper can not represent the true copper, lead and copper leaching tank there Mishaps, and the birth of aluminum water tank is to eliminate lead and copper leaching tanks, rather than simply as "aluminum tank" instead of "copper water tank."
Mishaps 1: thermal conductivity does not depend on thermal conductivity of copper, from the thermal conductivity for the best copper, aluminum and better lead the worst, "the Baptist lead and copper," as is copper solution in molten lead soaking to form a curing effect, copper was completely covered by the package lead, not simply play the good thermal conductivity of copper, so the "dip lead and copper," the thermal conductivity is not dependent on copper.
Mishaps 2: The melting point of lead is well below the national standard, that "on behalf of the copper aluminum" unsafe to say that the current water heater products, high temperature gas in heat exchanger temperature at the entrance has been able to reach about 1000 ° C , and the copper melting temperature very much higher than the melting point of pure aluminum, so the "generation of copper aluminum" unsafe.
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