The DR extruded fin is formed from an outer aluminium tube with a large wall thickness, which is aligned over an inner base tube. The two tubes are pushed through three arbors with rotating discs that literally squeeze or extrude the aluminium fins up and out of the muff material in a spiral shape in one operation. DR extruded finned tubes, in the form of base tube sleeved aluminum tube, (the base tube can be made of carbon steel, stainless steel, copper) is extruded by machine to form fins, the base of the fin is closely attached to the outer wall of the tube, and the heat transfer coefficient High, excellent heat transfer performance.
The technical feature of extruded aluminum finned tube is that the base tube is sleeved with an aluminum tube (the material of the base tube can be carbon steel, stainless steel, copper), which is extruded into fins by machine. The bottoms of the fins fit snugly against the outer wall of the tube. High heat transfer coefficient and excellent heat transfer performance. Rolled finned tube fins are smooth, burr-free, wrinkle-free, beautiful and bright, and easy to clean. When used as a component of air heaters and surface coolers, it is easy to remove condensed water on the surface, and it is not easy to dust and condense in dry heating and other occasions. The fins of the rolled finned tube are trapezoidal, with high fin strength, expanding the heat dissipation surface and maximizing the use of materials.
Extruded finned tubes are made of iron or copper-aluminum tubes and then rolled into fins. It has the characteristics of tight bonding, small thermal resistance, good heat transfer performance, high strength, small flow loss, and strong corrosion resistance. It is not easy to deform under thermal conditions, and has the advantages of long service life and so on.
The integrally rolled fins are smooth and burr-free for easy cleaning. When wet and cold in heating and air-conditioning engineering, dew condensation is easy on the surface of the fins. In heat exchange occasions such as drying and heating, the surface is anodized and the color is beautiful. , and can effectively prevent surface corrosion.
The aluminum rolled finned tube is made by rolling the aluminum tube as a whole, with no contact thermal resistance, high strength, resistance to thermal shock and mechanical vibration, good thermal expansion performance, and a considerable heat exchange surface. The role of the heat exchanger is ahead of that of the string-plate or wound-plate heat exchanger.
Production Technology Status of Finned Tubes
What Does Fin Tube Mean?
A fin tube is a tube that has small fins around the outside surface. These fins act as a filter and a mechanism to transfer heat from the material inside the tube to the outside space or vice versa. Fin tubes are used in applications that require a transfer of heat from a hot fluid to a colder fluid through the tube’s wall. The rate at which such heat transfer occurs depends on three factors:
- The temperature difference between the two fluids.
- The heat transfer coefficient between each of the fluids and the tube wall.
- The surface area to which the fluid is exposed.