Bimetal rolled type finned tube is the good corrosion resistant type tube. It overcomes the shortcomings of L-type and LL-type finned tubes. The inner tube is selected according to the corrosion of thermal fluid and pressure, such as carbon steel, stainless steel, titanium, brass, etc. The outer tube can be made of metal with good ductility and resistance to atmospheric corrosion, and good heat transfer performance, usually use the aluminum. The inside and outside the tube can be completely close together after being rolled.
Extruded finned tubes are created by taking iron or copper-aluminum tubes and rolling them into fins. These tubes possess several notable characteristics, including strong adhesion between the fins and the tube, low thermal resistance, excellent heat transfer performance, high strength, minimal flow loss, and impressive resistance to corrosion. These tubes are resistant to deformation even under high-temperature conditions and offer the advantage of a long service life, among other benefits.
The integrally rolled fins have a smooth surface, making them easy to clean. In heating and air-conditioning engineering, these fins tend to experience dew condensation when they become wet and cold. For heat exchange applications like drying and heating, the surface of the fins is anodized, resulting in a beautiful color while effectively preventing surface corrosion.
DR extruded finned tubes are one of specific types of finned tubes that are manufactured using the extrusion process. The extrusion method involves forcing a metal strip, typically made of aluminium or copper, through a die to create the desired fin shape and attach it to the outer surface of the tube.
The DR in DR extruded finned tubes refers to the distinctive DR-shaped fin design. The fins are securely bonded to the tube through the extrusion process, ensuring a strong and durable connection.
1. Good corrosion resistance, aluminum outside the inner tube can protect the inner tube from corrosion, so it has the long service life.
2. Good resistance to sudden changes in temperature and vibration, the maximum use temperature of DR-type finned tube is 280℃ as stipulated in GB15386-94. Good heat transfer performance, as the performance between G-type and L-type finned tubes.
3. High fin integrity and rigidity, not easy to be deformed because of the solid fins, available for high-pressure water and high-pressure gas to clear the scale. At the same time, due to the close combination of inner and outer tubes, it can maintain high heat transfer performance for a long time.
High cost, high manufacturing technology requirements, high weight. Compared with the L-type finned tube, the total price of equipment increased by 5-7%.