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翅片管若按照惯例可以根据型式的种类

2018-09-23 15:39:56 常州亿创钣金加工厂 阅读

翅片管若按照惯例可以根据型式的种类,在传热系数的实用范围内确定传热系数值。当不符合这些范围时,对工艺上要求完成的传热量,传热面积将大为超过,否则,输送流体的动力需要增加。翅片管中的传热过程不单是传热现象,而更重要的是流体流动状态,它刘·传热过程具有控制性的作用,传热壁面两侧的传热边界层,构成传热的主要热叭。当流体湍动程度增加时,此边界层变薄,热阻变小对传热有利,反之,湍动程度减小时,则对传热不利。

If the finned tube according to the convention can according to the type, in the practical range of heat transfer coefficient to determine the value of heat transfer coefficient. If these ranges are not met, the heat transfer area will be much larger than that required by the process. Otherwise, the power of conveying fluid needs to be increased. The heat transfer process in finned tube is not only the heat transfer phenomenon, but also the fluid flow state. It plays a controlling role in the heat transfer process. The heat transfer boundary layer on both sides of the heat transfer wall constitutes the main heat transfer horn. When the degree of turbulence increases, the boundary layer becomes thinner and the thermal resistance becomes smaller, which is beneficial to heat transfer. On the contrary, when the degree of turbulence decreases, it is unfavorable to heat transfer.

在空气分离装置中用于空气预冷。翅片管的型式和传热速率应该考虑回收或传递的物料流量和热价值、翅片管流体的流量比和流动特性、传热壁面材料的种类、操作压力和温变、操作的连续性,在流体的性质中特别是流体的结垢程度或是否是悬浮液,在这些凶素中各闽素的重要程度不尽相同,但是在确定翅片管的型式时,这些因素的重要性没有差别。

It is used for air precooling in air separation plant. The type and heat transfer rate of finned tubes should take into account the flow and heat value of recovered or transferred materials, the flow ratio and flow characteristics of finned tube fluids, the types of heat transfer wall materials, operating pressure and temperature variations, the continuity of operation, and in the nature of the fluids, in particular the degree of fouling of the fluids or whether they are suspensions, in these vicious cases. The importance of each element is different, but there is no difference in the importance of these factors in determining the type of finned tube.

另外,对壁的厚度也应加以限制。对给予的回收热量价值,传热面积和翅片管价格,又与流体摩擦阻力成反比的关系,因而也左右了动力所僻的费用。一般获得合理的最经济的设计和运转数据是在决定型式之后,但在选择型式之前不清楚最经济的条件的大致范刑是不便的。因此,设汁的第一步应给出大概的传热系数和型式,求山粗略的传热面积,而同时需要研究最适宜的温度差。两种流体的流量比为此温度差的支配条件

In addition, the thickness of the wall should also be limited. The retrieved heat value, heat transfer area and finned tube price are inversely proportional to the frictional resistance of the fluid, thus affecting the cost of power remoteness. Generally, it is inconvenient to obtain reasonable and economical design and operation data after determining the type, but it is inconvenient to know the general norm of the most economical conditions before choosing the type. Therefore, the first step in juice design should be to give the approximate heat transfer coefficient and type, to find the rough heat transfer area of the mountain, and at the same time to study the most appropriate temperature difference. The ratio of the flow rate of the two fluids to the temperature difference.辛苦整理.转载请注明http://www.wxsxsjx.com


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