Methanol One question per day Air cooler 2016.02.18
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This post was last edited by 654262293 on 2016-2-18 20:18. Methanol section – One question per day. Knowledge about air coolers: What is the function of the louvers in an air cooler? What are the basic requirements for the finned tubes in air coolers? Louvers are primarily used to regulate the airflow in air coolers; especially in heat-air circulation air coolers, the amount of hot air circulating and being discharged is controlled by these louvers. In addition, louvers serve as a \"shield\" to protect the tube bundle, preventing direct sunlight from damaging the tubes or hail from breaking the fins. However, due to energy loss caused by the throttling effect of the louvers, it is not used as a primary means for regulating air flow in ordinary air coolers. Finned tubes are the basic cooling elements of air coolers, and the following requirements are mainly imposed on them: (1) excellent heat transfer performance. (2) Good temperature resistance. (3) Good heat shock resistance. During startup, shutdown, or when the thermal load on the medium is unstable, as well as in the event of sudden changes in weather conditions, air coolers cause frequent fluctuations in the wall temperature of the finned tubes. Such thermal shock can lead to the loosening of the fins, thereby increasing the thermal resistance at the interface between the fins and the tubes. (4) Good resistance to atmospheric corrosion. (5) Easy to clean dust. (6) Lower manufacturing costs. In addition, it is required to have sufficient pressure resistance within the tube, a low pressure drop within the tube, low air resistance, good resistance to mechanical vibrations, and the use of metal materials that are easy to obtain. In practical applications, it is difficult to meet all the above requirements simultaneously; therefore, the finned tube should be selected based on the actual operating conditions.
It is used to adjust the temperature after air cooling; in other words, the temperature is adjusted by changing the opening degree of the louvers. Opening the louvers facilitates heat dissipation and helps to lower the temperature.
The louver of the air cooler is used to regulate its temperature. When the air temperature is high, they are all opened; when the temperature is low, they are closed by a certain angle. The manufacturing of finned tubes mainly involves the shaping of the fins and the connection between the fins and the tube. Based on the molding process, they can be divided into four types: strung sheets, baked sheets, cold-rolled sheets, and die-cast sheets. Based on the way the fins are connected to the tubes, they can be classified into tension connection, mechanical connection, and metallic connection. In the chip stringing and winding processes, there are also methods such as welding, embedded hot winding, and expansion joining.
This post was last edited by Zhongsheng 007 on 2016-3-7 at 13:37. Blinds are used to prevent foreign objects from entering the fan system and to regulate the air flow in the air cooler. The requirements for finned tubes should take into account factors such as pressure resistance and heat exchange area.