一台翅片管的换热面积就是每根翅片管换热面积的总和

翅片管的传热原理用普通的圆管(光管)组成的热交换器，在很多情况下，管外流体和管内流体对管壁的换热系数是不一样的。所谓换热系数，是指单位换热面积，单位温差(流体与壁面之间的温差)时的换热量，它代表流体和壁面之间的换热能力的大小。翅片管换热器的设计工艺中，一台翅片管的换热面积就是每根翅片管换热面积的总和。知道了翅片管的换热面积，就能有效的清楚每台翅片管换热器的换热面积为多少。

The heat transfer principle of finned tube is a heat exchanger consisting of a common round tube (smooth tube). In many cases, the heat transfer coefficient of the fluid outside the tube is different from that of the fluid inside the tube. The so-called heat transfer coefficient refers to the unit heat transfer area, the unit temperature difference (the temperature difference between the fluid and the wall) when the heat transfer, it represents the size of the heat transfer capacity between the fluid and the wall. In the design process of finned tube heat exchanger, the heat transfer area of one finned tube is the sum of the heat transfer area of each finned tube. Knowing the heat transfer area of finned tube, we can effectively know the heat transfer area of each finned tube heat exchanger.

举例说明翅片管换热器换热面积的计算方式：

An example is given to illustrate the calculation method of heat transfer area of finned tube heat exchanger.

翅片管型号为：CPG (Φ25×2mm/57/2.8/0.35) 求每米翅片管的换热面积？

The fin tube type is CPG (25 * 2mm/57/2.8/0.35), and the heat exchange area of each fin tube is calculated.

解答：

Answer:

翅片管换热器的总面积等于翅片管的裸露部分面积+翅片面积

The total area of finned tube heat exchanger is equal to the bare part area of fin tube and fin area.

翅片管裸露部分面积=3.14X0.026X(1000—(1000/2.8)X0.35)=0.071435㎡

The exposed area of finned tube is =3.14X0.026X (1000 - (1000/2.8) X0.35) =0.071435

翅片部分的面积=3.14X(0.0285?-0.013?)X357X2+3.14X0.057X0.125=1.4645125㎡

The area of the fin part =3.14X (0.0285? -0.013?) X357X2+3.14X0.057X0.125=1.4645125?

翅片管总的换热面积=0.071435+1.4645125=1.536㎡/m.

The total heat transfer area of fin tube is =0.071435+1.4645125=1.536 /m.

即该型号翅片管的换热面积为1.536㎡/米。

That is, the heat exchange area of the finned tube is 1.536 / M.



水在壁面上凝结时的换热系数为： 10000—20000 w/(m2.℃)

When the water condenses on the wall, the heat transfer coefficient is 10000 - 20000 w/ (m2. C).

水在壁面上沸腾时的换热系数为： 5000----10000 ------

When the water is bo, iling on the wall, the heat transfer coefficient is 5000----10000 -

水流经壁面时的换热系数大约为： 2000---10000 ------

The heat transfer coefficient of water passing through the wall is about 2000---10000.

空气或烟气流经壁面时的换热系数为： 20---80 --- ---

The heat transfer coefficient of air or flue gas passing through the wall is 20---80 -

空气自然对流时的换热系数只有： 5---10 -------

The heat transfer coefficient of natural convection is only 5---10: -

由此可见，流体与壁面之间的换热能力的大小相差是很悬殊的。

It can be seen that the difference in heat transfer capacity between the fluid and the wall is very different.辛苦整理.转载请注明http://www.wxsxsjx.com