What are the classifications of finned tubes?

What is a finned tube?

What are the classifications of finned tubes?

What is the appearance and shape of the finned tube?

What are the product structures and characteristics of finned tubes?

What material are finned tubes made of?

1. The concept of finned tube

Finned tube is a heat exchange element, mainly to improve heat exchange efficiency, usually by adding fins on the surface of the heat exchange tube to increase the outer surface area (or inner surface area) of the heat exchange tube, so as to improve the heat exchange efficiency The purpose of the heat exchange tube.

2. What types of finned tubes can be classified according to the working principle?

At present, the most common and widely used is the partition wall heat exchanger, and the design and calculation of other types of heat exchangers are often referred to the partition wall heat exchanger. As a general-purpose equipment, heat exchangers are classified according to their working principles and can be divided into partition type, hybrid type and heat storage type.

When the evaporator used in the low-temperature refrigeration system of the finned tube works at a low temperature (below 0°C), the surface of the finned tube generally has the problem of frosting. The impact of frosting on the performance of heat exchangers is reflected in the reduction of its heat transfer coefficient and the increase of air resistance. A reasonable heat exchanger structure should reduce the impact of these two aspects at the same time. When the frost starts to form, the surface roughness of the evaporator increases, causing the heat transfer area to increase, and the gas flow rate also increases, so the heat transfer coefficient K increases at the initial frosting stage, but as the frost layer continues to thicken, the heat transfer coefficient K increases. The thermal resistance to heat increases and the final heat transfer coefficient K decreases.

When the airflow passes through the evaporator, because the water vapor in the air is continuously deposited on the surface of the finned tubes, the relative humidity of the air decreases, and the amount of frosting on the surface of the finned coil tubes along the direction of the airflow gradually decreases, so the fins in the front rows of the evaporator The frosting of the sheet tubes is serious, and the frosting of the last few rows of tubes is relatively light.

If the variable-pitch fin structure is adopted to make the fin pitch downstream along the wind direction smaller and smaller, it can maintain its high heat transfer efficiency under frosting conditions and prolong its frosting time. After the evaporator adopts the variable-pitch finned tube structure, when the air vertically sweeps the staggered finned tubes, the staggered distribution of the finned tubes makes the upstream finned tubes have a flow around the downstream finned tubes, which strengthens the front half of the finned tubes. Part of the heat exchange capacity, the distribution of the finned tubes at the back narrows the flow path and increases the flow rate, thereby enhancing the heat transfer in the second half of the finned tubes.

3. Structure and characteristics of finned tube radiator

The finned tube is rolled from an aluminum tube as a whole, has no contact thermal resistance, high strength, thermal shock resistance and mechanical vibration, good thermal expansion performance, and has a considerable extended heat exchange surface. The heat exchange made of this finned tube Heat exchanger, the effect is ahead of the serial plate or wound plate heat exchanger.

4. What are the advantages of hot-dip galvanized finned tube radiators over ordinary finned tube radiators?

The hot-dip galvanized finned tube radiator is on a high-quality seamless steel pipe, and the high-quality steel strip is tightly and evenly wound on the outer surface of the base pipe by mechanical force through a special winding machine, and the two ends are fixed by spot welding; then Hot-dip galvanizing treatment of the steel finned tube as a whole. The galvanized layer can form a special metallurgical structure, which can withstand the mechanical damage during transportation and use; every part of the galvanized part can be galvanized, even in the depressions, sharp corners and hidden places can be fully protected . Relatively speaking, it is stronger in corrosion resistance and protection than ordinary fin radiators.

5. What are the advantages of stainless steel finned tube radiators compared to carbon steel? Which is more affordable?

It is enough to compare stainless steel and carbon steel. The advantage of stainless steel is its beautiful appearance and super corrosion resistance. Carbon steel is the kind of black and not slippery, and it is easy to oxidize and corrode in the air. Which material to choose mainly depends on which working conditions it will be used for. It is better to choose stainless steel for strong corrosive places, and carbon steel for ordinary places. Of course, the price is more expensive than stainless steel, and it is much more expensive; I hope it can help you.

Vrcoolertech has been focusing on the research and development and production of finned tube radiators for 10 years. It has rich industry experience, many major customer engineering cases, and a wide range of cooperation fields. It can meet the needs of customer groups in various fields.

For more product knowledge, you can follow VRcoolertech official website in real time, or contact us via email info@cstheatexchanger.com; Tel: +8615618652003