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Structural design of heat exchanger and advantages of countercurrent heat transfer
Nov 13, 2018

Structural design of heat exchanger

1. During the operation, it can be based on the highest working temperature and the highest working pressure of the heat exchanger.

As well as thermal design and resistance calculation results, determine the material and size of each component to ensure stable operation of heat transfer of the heat exchanger.

2. Select welding method and sealing material according to the operating temperature, pressure and fluid characteristics of the heat exchanger

3. Design the head, nozzle and partition to ensure uniformity of fluid distribution in the heat exchanger.

4. In order to meet the thermal resistance and resistance properties of the heat exchanger structural design, the strength of the main components must be checked to avoid lack of strength under extreme operating conditions, resulting in damage or excessive selection and waste.

5. Consider maintaining heat exchangers (including cleaning, repair and maintenance, etc.) and shipping requirements.

Advantages of countercurrent heat transfer in heat exchangers

  

There are generally two types of fluid flow directions in a heat exchanger: downstream and countercurrent. When flowing downstream, the temperature difference between the two fluids at the inlet is greatest and gradually decreases along the heat transfer surface of the heat exchanger, and the temperature difference from the outlet is minimal. In the case of countercurrent flow, the temperature distribution of the two fluids along the heat transfer surface is relatively uniform. Under the condition that the inlet and outlet temperatures of the cold and hot fluid of the heat exchanger are constant, when the two fluids have no phase change, the average temperature difference in the countercurrent is the largest.

  

Under the same amount of heat transfer, the countercurrent can increase the average temperature difference and the heat transfer area of the heat exchanger decreases. If the heat transfer area of the heat exchanger is constant, the consumption of heating or cooling fluid can be reduced by using reverse flow. The former can save heat exchanger costs, the latter can save operating costs, so the heat exchanger should use countercurrent heat transfer in the design or production.http://www.wxlsshzb.com/


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