Views: 2 Author: Site Editor Publish Time: 2023-02-09 Origin: Site
Fin spacing and number of tubes of finned tube heat exchanger
The pitch of the fins of the finned tube heat exchanger
The high-quality finned type of finned tube heat exchanger will have multiple fins, and there will be a fixed distance between each fin during operation. For heat exchanger types affected by eddy currents, the heat exchange performance increases with decreasing fin spacing. However, when the air velocity is high and the number of tube rows is large, the influence of the fin spacing on the heat transfer coefficient can be ignored.
Number of tube rows in finned tube heat exchanger
For flat-plate fin heat exchangers, the number of tube rows will have a greater impact on the heat transfer characteristics when the number of tube rows is large and the spacing between the fins is relatively small. This is due to the influence of the boundary layer, and the heat transfer factor will decrease as the number of tube rows increases.
When the finned tube heat exchanger is used, the larger the diameter of the heat exchange tube, the larger the invalid area behind the tube will be, so the size of the tube diameter will directly affect the heat exchange effect and the smaller the diameter of the heat exchange tube The thermal effect is better and bigger. In addition, for other types of finned heat exchangers, if a small tube diameter is used, the heat transfer coefficient outside the tube can be increased and the pressure drop loss can be reduced.
In the heat medium-heated hot blast stove system of the finned tube heat exchanger, the hot air is obtained by heating the air in the heat exchange device through the heat medium. Therefore, the performance of the heat exchange device (ie heat exchanger) and Whether the matching is reasonable or not will largely affect the performance of the entire heat medium heating system. In order to improve heat exchange efficiency, finned heat exchangers are generally used in heat medium heating hot air systems. Now the finned tube heat exchanger has been finalized, so it only needs to be selected according to the heat capacity and other parameters of the hot air system.
The finned tube heat exchanger is made of finned or spiral finned radiator tubes installed in a heat-insulated metal shell. It is usually installed on the exhaust end of the heating fan or the front end of the equipment using hot air (under full negative pressure operating conditions). It is often composed of multiple groups arranged in series. Due to the different metal materials and fin structures, it has many forms; wound type; steel GL type and SRZ type, copper S type and U type.
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