1. Different heat transfer properties. Under the same temperature conditions, the thermal conductivity of aluminum alloy pipes is 210w/m.℃, and the thermal conductivity of seamless steel pipes is 46w/m.℃. That is to say, under the same temperature conditions, the heat conduction amount of aluminum alloy pipes is 4.56 times that of seamless steel pipes. Aluminum alloy radiator pipes have better heat transfer performance than seamless steel radiator pipes because of their good heat conduction characteristics and structural characteristics that easily allow cold air to sink.
2. The installation difficulty is different. Aluminum alloy pipes (aluminum pipes for short) are formed by one-time pressing of aluminum alloy pipes and fins. The pipes are simple to make, light in weight and easy to install. For seamless steel pipes, each seamless steel pipe needs to be derusted inside and outside. The production process is complicated. After the production is completed, anti-rust paint needs to be applied. It is also heavy, requires high labor intensity for workers, and is difficult to install.
3. One-time investment is different. For a low-temperature cold storage with the same nominal volume, the one-time investment of aluminum alloy top row pipes is less than that of seamless steel pipe top row pipes.
4. The energy saving effects are different. Aluminum alloy pipes are longitudinally ribbed finned tubes with a small refrigerant charge per unit length. This not only reduces the refrigerant charge of the entire refrigeration system, but also reduces the size or capacity of auxiliary equipment in the refrigeration system. The potential danger probability is also relatively small. Due to its good thermal conductivity and special structure, aluminum alloy pipes have high heat transfer efficiency, which is beneficial to reducing equipment investment and energy-saving operation. Seamless steel pipes have a large refrigerant filling volume per unit length, and the size or capacity of the auxiliary equipment of the refrigeration system is large, so the potential danger probability is relatively large. Moreover, seamless steel pipes generally use smooth pipes, which have poor heat transfer efficiency and are not conducive to investment reduction and energy-saving operation.
5. The degree of compliance with food hygiene requirements is different. There is a layer of corrosion-resistant oxide film on the surface of the aluminum alloy exhaust pipe, which will not rust after long-term use and will not pollute food and the environment. Although seamless steel pipes are coated with anti-rust paint, they are prone to rust due to long-term use in low-temperature and humid environments. When exposed to frost, rust may contaminate food and the storage environment. Therefore, aluminum alloy pipes are more in line with food hygiene requirements than seamless steel pipes. Alloy pipes are more in line with food hygiene requirements than seamless steel pipes.
6. Safety performance. The destructive test pressure of aluminum alloy pipes is 12Mpa, the strength test pressure is 2.4Mpa, the sealing test pressure is 1.6Mpa, and the pressure test of the aluminum alloy pipe system is maintained for 24 hours. In cold storage, it is safe to use aluminum alloy pipes. In recent years, the practice of using a large number of aluminum alloy pipes in cold storage projects has also proved that as a new type of energy-saving evaporator, the application of aluminum alloy pipes is safe and reliable. Under normal use, the theoretical service life of aluminum alloy pipes is longer than that of seamless steel pipes.
To sum up, aluminum pipes are better than seamless pipes in terms of installation, investment, energy saving effect, hygienic requirements and safety performance. Therefore, aluminum pipes are more suitable for cold storage construction.
2. The installation difficulty is different. Aluminum alloy pipes (aluminum pipes for short) are formed by one-time pressing of aluminum alloy pipes and fins. The pipes are simple to make, light in weight and easy to install. For seamless steel pipes, each seamless steel pipe needs to be derusted inside and outside. The production process is complicated. After the production is completed, anti-rust paint needs to be applied. It is also heavy, requires high labor intensity for workers, and is difficult to install.
3. One-time investment is different. For a low-temperature cold storage with the same nominal volume, the one-time investment of aluminum alloy top row pipes is less than that of seamless steel pipe top row pipes.
4. The energy saving effects are different. Aluminum alloy pipes are longitudinally ribbed finned tubes with a small refrigerant charge per unit length. This not only reduces the refrigerant charge of the entire refrigeration system, but also reduces the size or capacity of auxiliary equipment in the refrigeration system. The potential danger probability is also relatively small. Due to its good thermal conductivity and special structure, aluminum alloy pipes have high heat transfer efficiency, which is beneficial to reducing equipment investment and energy-saving operation. Seamless steel pipes have a large refrigerant filling volume per unit length, and the size or capacity of the auxiliary equipment of the refrigeration system is large, so the potential danger probability is relatively large. Moreover, seamless steel pipes generally use smooth pipes, which have poor heat transfer efficiency and are not conducive to investment reduction and energy-saving operation.
5. The degree of compliance with food hygiene requirements is different. There is a layer of corrosion-resistant oxide film on the surface of the aluminum alloy exhaust pipe, which will not rust after long-term use and will not pollute food and the environment. Although seamless steel pipes are coated with anti-rust paint, they are prone to rust due to long-term use in low-temperature and humid environments. When exposed to frost, rust may contaminate food and the storage environment. Therefore, aluminum alloy pipes are more in line with food hygiene requirements than seamless steel pipes. Alloy pipes are more in line with food hygiene requirements than seamless steel pipes.
6. Safety performance. The destructive test pressure of aluminum alloy pipes is 12Mpa, the strength test pressure is 2.4Mpa, the sealing test pressure is 1.6Mpa, and the pressure test of the aluminum alloy pipe system is maintained for 24 hours. In cold storage, it is safe to use aluminum alloy pipes. In recent years, the practice of using a large number of aluminum alloy pipes in cold storage projects has also proved that as a new type of energy-saving evaporator, the application of aluminum alloy pipes is safe and reliable. Under normal use, the theoretical service life of aluminum alloy pipes is longer than that of seamless steel pipes.
To sum up, aluminum pipes are better than seamless pipes in terms of installation, investment, energy saving effect, hygienic requirements and safety performance. Therefore, aluminum pipes are more suitable for cold storage construction.
