Finned tube products, may be very familiar with friends in the industry; but for friends who have not touched, may be very strange, there are questions, what is finned tube? What are the classification of finned tubes? What is the appearance and shape of the product? What are the product structure and characteristics? What materials are they made of? And how much does it cost? With these problems, we will learn about fin tube and fin tube radiator from 5 aspects.

1. the concept of finned tube

Finned tube is a kind of heat transfer element. In order to improve the heat transfer efficiency, it is usually used to increase the surface area (or inner surface area) of the heat transfer tube by adding fins on the surface of the tube, so as to achieve the purpose of improving the heat transfer efficiency.

2. what types of finned tubes can be classified according to their working principles?

At present, the most common and widely used type of heat exchanger at home and abroad is the inter-wall heat exchanger. The design and calculation of other types of heat exchangers often draw lessons from the inter-wall heat exchanger. Heat exchangers, as a kind of general equipment, can be classified into three types according to their working principle, i.e. wall-to-wall type, mixed type and regenerative type.

When the finned tube evaporator is used in cryogenic refrigeration system, there is a problem of frosting on its surface. The influence of frosting on the performance of heat exchanger is manifested in two aspects: reducing heat transfer coefficient and increasing air resistance. The reasonable structure of heat exchanger should reduce the influence of these two aspects at the same time. When the frost begins to form, the surface roughness of the evaporator increases, which results in the increase of heat transfer area and gas flow rate. Therefore, the heat transfer coefficient K increases at the initial stage of frosting, but with the increase of frost layer, the heat transfer resistance increases, and the final heat transfer coefficient K decreases.

When the air flow through the evaporator, because the water vapor in the air continuously deposits on the surface of the finned tube, the relative humidity of the air decreases, and the frost on the surface of the finned coil gradually decreases along the direction of the air flow.

If the fin structure with variable pitch is adopted, the fin spacing downstream along the wind becomes smaller and smaller, the higher heat transfer efficiency can be maintained and the defrosting time can be prolonged under frosting conditions. After the evaporator adopts the structure of finned tube with variable spacing, when the air sweeps the staggered finned tube, the staggered distribution of finned tube makes the upstream finned tube flow around the downstream finned tube, enhances the heat transfer capacity of the front half of the finned tube, and the distribution of finned tube makes the flow channel narrow and the flow velocity increase, thus making the finned tube behind. The heat transfer in the half part is also strengthened.

3. the structure and characteristics of finned tube radiator

The finned tube is rolled by aluminum tube as a whole. It has no contact thermal resistance, high strength, good thermal shock resistance and mechanical vibration resistance, good thermal expansion performance and considerable expanded heat transfer surface.

4. what are the advantages of the hot-dip galvanized finned tube radiator and the ordinary finned tube radiator?

Hot-dip galvanized finned tube radiator is a high-quality seamless steel tube, through a dedicated winding machine, high-quality steel strip by mechanical force tightly and evenly wound on the outside surface of the tube, both ends of the spot welding fixed; and then the steel-wound finned tube as a whole for hot-dip galvanizing treatment. The galvanized layer can form a special metallurgical structure that can withstand mechanical damage during transportation and use; each part of the galvanized piece can be coated with zinc, which can be fully protected even in depressions, sharp corners and hidden places. It is better than ordinary fin radiator for corrosion resistance and protection.

5. what are the advantages of stainless steel finned tube radiator and carbon steel ratio? Which is more affordable?

From stainless steel and carbon steel to compare it, the advantages of stainless steel lies in the external beauty, super corrosion resistance, carbon steel is that kind of dark, easy to oxidation and corrosion in the air. Choose which kind of material is mainly considered for which working conditions, strong corrosive place to choose stainless steel is better, ordinary place carbon steel on the line. The price is certainly more expensive and much more expensive for stainless steel. I hope I can help you.

Qingli has been devoted to the R&D and production of finned tube radiators for 10 years, and has rich industry experience. There are many large customer engineering cases and extensive cooperation fields, which can meet the needs of customers in various fields. A one-stop solution, so that customers can save worry, ease and peace of mind. For more product knowledge, you can pay close attention to the official website or telephone consultation: 020-28140958.