Finned heaters for air heat exchangers are the most widely used heat exchange equipment in heating industry. It achieves the purpose of enhancing heat transfer by adding fins to the ordinary base tube. The base pipe can be steel pipe; stainless steel pipe; copper pipe and so on. The fins can...
Finned heaters for air heat exchangers made by Jaye are the most widely used heat exchange equipment in heating industry. It achieves the purpose of enhancing heat transfer by adding fins to the ordinary base heating tube. The material of base tube can be steel pipe; stainless steel pipe; copper pipe and so on. The fins can also be made of steel belt; stainless steel belt, copper belt, aluminum belt and so on.
Finned heaters for air heat exchangers are mainly used for air heating in the drying system and is the main equipment in the hot air device. The heat medium used by the radiator can be steam or hot water, or heat transfer oil. The working pressure of the steam is generally not more than 0.8Mpa, and the temperature is below 170°C.
It is mainly composed of three rows of parallel spiral fin tube bundles between the air flow direction. It adopts mechanical winding, and the contact surface between the radiating fins and the radiating tube is large and tight, and the heat transfer performance is good and stable.
Under normal circumstances, the spacing and height of the tube heat exchanger mainly affect the fining ratio, which has a great relationship with the film heat transfer coefficient of the medium inside and outside the tube. If the heat transfer coefficients of the inner and outer films of the tube are quite different, a tube with a larger fin ratio, such as steam heating air, should be selected. When there is a phase change in one side of the medium, the difference in heat transfer coefficient will be greater, such as the exchange of hot and cold air. When the hot air drops below the dew point, it can be used. In the case of heat exchange between air without phase change, or heat exchange between water and water, a bare tube is usually more suitable. Of course, a low-finned tube can also be used, because at this time it is a weak heat supply coefficient, and strengthening either side of it will have a certain effect. However, the effect of too large finning ratio is not obvious, and the best internal and external contact area of the tube is strengthened at the same time, and threaded or fluted tube can be used.
The pitch of the fins is mainly to consider factors such as dust accumulation, dust formation, easy cleaning, etc., and at the same time, it must strictly comply with the equipment's pressure drop requirements. When arranging, the distance between the tube and the tube is not easy to be too large, generally> 1mm or more is suitable for tube layout. In the process of heat exchange, when air flows through the finned tube heat exchanger, the front and back sides of the fin are mainly involved in heat exchange. There is only a small amount of radiant heat transfer in the middle of the two finned tubes, and the heat transfer effect is not obvious. Since this part has no fins and resistance, the air is easy to penetrate. In the process of air heating, the unheated cold air will neutralize the heated hot air passing through the middle of the fins, which will reduce the heat exchange effect. Compared with foreign finned tube heat exchangers, tubes The spacing is only 0.5mm larger than the outer diameter of the fins, which shows the importance of the tube spacing when the fin tubes are arranged.
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