ABSRTACT: The function of temperature control of air conditioner and refrigerator is mainly realized by evaporation and condensation of copper tube of heat exchanger. The size and heat transfer performance of the heat exchange heat transfer tube determine the efficiency and miniaturization of the whole air conditioner and refrigerating device to a great extent. These machines use special-shaped copper tubes with high thermal conductivity. 1. The temperature control of air conditioners and chillers is mainly realized by the evaporation and condensation of the copper tubes of heat exchangers. The size and heat transfer performance of the heat exchange heat transfer tube determine the efficiency and miniaturization of the whole air conditioner and refrigerating device to a great extent. These machines use special-shaped copper tubes with high thermal conductivity. Recently, heat sinks with inner grooves and high fins have been developed and produced to produce heat exchangers in air conditioners, chillers and waste heat recovery devices, taking advantage of the excellent processing properties of copper, the total heat transfer Coefficient of the new type heat exchanger can be increased to 2 ~ 3 times of that of the ordinary tube and 1.2 ~ 1.3 times of that of the ordinary low-finned tube. 2. Clocks and watches are currently produced by timepieces, timers and devices with a clock mechanism, most of which work with parts made of “Clock brass”. Copper alloys containing 1.5-2% lead have good processability and are suitable for large-scale production. For example, gears are cut out of long extruded brass rods, flat wheels are punched out of strips of corresponding thickness, and brass or other copper alloys are used to make engraved clock faces, screws and joints, and so on. Large quantities of cheap watches are made of gunmetal (tin-zinc bronze) or plated with nickel-silver (cupronickel) . Some famous big bells are made of steel and copper alloys. Britain’s Big Ben uses a solid gun for the hour hand and a 14-foot copper tube for the minute hand. A modern clock factory, using copper alloy as the main material, with a press and precision mold processing, can produce 10,000 to 30,000 watches a day, the cost is very low. 3. Paper-making paper looks simple on the surface, but the paper-making process is very complicated. It needs many steps and many machines, including cooler, evaporator, beater, paper machine and so on. Many of these components, such as various heat-exchange tubes, rollers, striking rods, semi-liquid pumps and wire Mesh, are mostly made of steel alloys. For example, the current use of long-screen paper machine, it will be made of pulp to the rapid movement of Small Mesh (40 ~ 60 Mesh) on the screen. The cloth is made of brass and phosphor bronze wire. It is very wide, usually more than 20 feet (6 meters) , and needs to be perfectly straight. The cloth moves over a series of small brass or copper rollers, and as it passes with the pulp sprayed onto it, moisture is sucked out from below. The net vibrates at the same time so that the small fibers in the pulp stick together. Large paper machines have nets that can be as large as 26 feet 8 inches (8.1 meters) wide and 100 feet (30.5 meters) long. Wet Pulp not only contains water, but also contains chemicals used in the papermaking process, very corrosive. In order to ensure the quality of paper, the cloth material requirements are very strict, not only to have high strength and flexibility, but also to resist pulp corrosion, copper alloy can be competent. 4. To make a photographic plate from a copperplate in printing. The copper plate with polished surface is sensitized with photographic emulsion and photographed on it. Photosensitive copperplate to be heated to harden the glue. To avoid thermal softening, copper often contains small amounts of silver or arsenic to increase the softening temperature. The plate is then etched to form a printed surface with bump and dot patterns. In an automatic typesetter, a plate is made by the arrangement of brass type blocks, another important use of copper in printing. Type blocks are usually made of leaded brass, sometimes also of copper or bronze. 5. Brewing in the world of beer brewing, copper plays an important role. UCHIMURA, who often uses copper as a malt bucket and fermentor. More than a dozen of these vats, each with a capacity of more than 20,000 gallons, are kept in well-known breweries. In a fermentation tank, copper tubes are often cooled by running water in order to reduce the temperature. Copper pipe is also used to pass water vapor in brewing beer for heating, as well as copper pipe conveying liquor and so on. When whiskey and other strong liquors are distilled, a copper still is usually used. Whiskey Ale is distilled twice, in two large copper stills. 6. In the pharmaceutical industry, all kinds of steaming, boiling and vacuum devices are made of pure copper. Zinc cupronickel is widely used in medical devices. Copper Alloy or glasses frame commonly used materials. 

Source: Web Collation

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