Compound radiator is a set of two materials into waterways-type radiator, copper-aluminum, stainless steel aluminum compound, plastic-aluminum 4 types. Its name already indicates that the two kinds of materials and set-location, such as copper-aluminum compound represents two materials are copper and aluminum, set-position is within the copper, aluminum, copper, aluminum is a watercourse.
Copper-aluminum compound radiator early in 1999 was born in Shandong high-density, has been in operation for nine years. It is based on my heating water quality and management too much is still not standardized, sheet steel radiator often corrosive influence its development of leakage and, in particular situations came into being. In General, copper corrosion rate is 25 times that of steel and copper water radiators can be used in a broader water quality, longer service life. Together with copper heat conductivity is good, the thermal efficiency is high, it would be welcome, and was soon promoted to become the best-selling one radiator products.
Copper-aluminum compound radiator, copper in specialty channel corrosion resistance, aluminum coat also increased its decorative and soon swept the country. As copper prices than steel, so a steel aluminum compound radiator, it looks beautiful forms, in the market are also popular because it is cheaper than copper aluminum compound, but its life to lower, or also for paint internal coating, or use of pump-wall steel pipes. Steel aluminum compound lumen copper aluminum compound of cheap products, in addition to the advantages of beautiful, very few other features.
Entering in 2006, the price of copper, silver, steel aluminum compound forge further development, but the readily oxygen steel waterways than corrosive still hamper the smooth development of, and stainless steel aluminum compound radiator forge development, but it is very short-lived is brilliant for a year, the price than copper stainless steel although cheaper, but its welding Department has lost the nature of the stainless steel, becoming the largest corrosion leakage problems. Plastic-aluminum composite radiator currently has two production: Jiangyin City, Jiangsu Province and Inner Mongolia baotou-Biao. The product strong corrosion resistance, long service life; smooth, water tables within the resistance is small, easily scaling; appearance like copper aluminum compound as beautiful, light weight, high bearing pressure; although the heat slowly, the thermal efficiency is low, but hot # is good, more suitable for space heating, is now made of plastic, cost reduction, and its prospects.
The key technology of compound radiator is twofold: first, the composite technology; second pipe and drainage channel of connection technology.
Composite technology existing 5: 1, mechanical expanding: dimensional stability, low efficiency, attention tubes and rose head clean to prevent stolen goods scratches.
2. hydraulic expanding: more efficient, internal dimensions, wall is not uniform.
3. inner pipe pressure into: steel soft cannot be used, steel and stainless steel available on inner and outer pipe dimension tolerances demanded that fit into the short tube, bent into a long tube easy waste.
4, made of aluminum fabricated: in half, a coat with a self-tapping cap screws or rivets, low efficiency, gap, thermal contact resistance.
5. inner tube into the aluminum tube bore open huokou, bore can be flexible to expand, so that the inner tube can easily push, simple and convenient high production efficiency. Composite close degree is a matter of concern to the problem, start compound more tight, the long-term health and material fatigue, Vipassana will loose, thermal resistance increase, reduce the heat, this is a common failing of compound radiator. Risers and drainage channel of connection technology, from connection strength, steel flanging than flanging is good, but outside, flanging and Varus times better. Flanging, flow smoothly, the resistance is small, the water flow, no water, no scale corrosion, the legislature is not inserted, the province point material. After connection, the importance of welding, the welding point is compound radiator maximum leakage vulnerability, it easily, so that the compound radiator advantages immediately.
Beijing has long since December 2004, the implementation of local standards JBD01 — 619-2004 the heating system of technical regulation of water quality and preservation, the national uniform standards being developed. When the steel, aluminum radiator can be safely used, this process complex compound radiator also lose their advantages, there is no value, maximum stay is steel aluminum compound, increase color varieties. Compound radiator is in our current heating water quality and management too much code for situations arising, and this specification will not be long, it will not only affect our development of steel as the main heat sink, and returned to the boiler and huge enormous corrosion in heating systems, the only standardized is lost.
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