Which kind of finned tubular air heating elements has a good heat transfer effect?
Which kind of finned tubular air heating elements has a good heat transfer effect? I believe this is a problem that users and friends are more concerned about. Today we will sort out and share it with you.
In fact, when finned tubular air heating elements heat exchangers are used in different industries, you need to select the corresponding fin tube type and fin tube material according to the corresponding working condition information. What about the heat transfer efficiency, the fins of different materials The heat exchange efficiency of tube and finned tube types is also different, and the specific needs are based on the manufacturer's selection.
Let me share with you the heat exchange efficiency of different finned tubes. The finned tubes can be divided into high-finned tubes, medium-finned tubes and low-finned tubes according to the height of the fins. Among them, air heat exchange The most commonly used device is a high fin tube.
1. The fin of the low-fin tube is directly extruded from the tube material. The height of the fin is only 1-2mm. The common low-fin tube is 1.6 mm in the shell-and-tube heat exchanger. This kind of fin tube is not used. Consider the thermal resistance of contact with the tube.
2. The fin height of the middle fin tube is about 3.2 mm, which is often used in pressure vessel equipment such as shell-and-tube heat exchangers.
3. High finned tubes are usually used in air heat exchangers, and their height ranges from 6.4-25 mm, depending on the working conditions.
Air heat exchangers with high finned tubes as heat exchange elements are widely used in various industrial applications. This type of heat exchange is often used when the fluid on one side is at a high pressure or the heat transfer coefficient is much larger than that on the other side. Device. For example, in a gas-liquid heat exchanger, the heat transfer coefficient on the liquid side is generally much higher than that on the gas side, and fins are generally added on the gas side to increase the heat transfer area.
Air heat exchangers with high-finned tubes as heat exchange elements mostly use seamless steel tubes as base tubes. The fins are generally used outside the tube, usually water, oil, steam, refrigerant running through the tube, and air or smoke outside the tube. Air flows through the finned tube.
