Wound finned tubeClassified by material: steel pipe wrapped around steel sheet, steel pipe wrapped around aluminum sheet, steel pipe wrapped around copper sheet, etc;

Wound sheetFinned tubeIts fin material is aluminum, and its fins are L-shaped or LL shaped, known as L-shaped finned tubes and double L-shaped finned tubes. It can be processed into smaller sheet spacing, with a minimum sheet spacing of 2.3mm. The unit heat transfer area is larger, and the price is slightly higher than that of steel wrapped fins, and cheaper than bimetallic composite finned tubes. The heat transfer effect is also between the two, but the disadvantage is that the rigidity of the aluminum material is not sufficient, making it unsuitable for working environments with large thermal expansion and contraction. Moreover, as the service life increases, the impact of its contact thermal resistance becomes more obvious. It is usually used in systems with relatively stable working environments, such as hot water heating or cooling. When using steam and heat transfer oil as heating media, caution should be exercised.

　 Wound sheetFinned tubeAt present, it is widely used and can be processed into stainless steel sheets, aluminum fins, and carbon steel sheetsAny finned tube that is coiled into a spiral shape can be called a coiled finned tubeThis is determined by the processing technology.