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The best flow rate of plate heat exchanger
Sep 16, 2020

The choice of flow rate of plate heat exchanger plays a key role in heat transfer effect, energy consumption and operating cost. In the process of velocity selection, many problems need to be analyzed. Is there an optimal flow rate? In theory, yes, let's look at the following information:

 

According to the relevant information, the amount of heat transfer area is proportional to the 0-0.9 power of the velocity. The power consumption is proportional to the third power of the velocity. It can be seen that low speed can save energy and reduce operating costs. However, excessively low flow rate will lead to a significant decrease in heat transfer coefficient, an increase in heat transfer area, and an increase in initial investment.

 

Therefore, in theory, there should be an optimal flow rate problem for plate heat exchanger, that is, the initial investment and operating cost are minimum at this flow rate. It has been proved by practice that it is appropriate to control the general water velocity in the range of.2 ~ 0.6 m/s. For the central heating system with high temperature water, the allowable pressure drop of the external network for the heat exchange station is generally 30-50kPa. Therefore, in the calculation of plate heat exchanger, the flow rate of primary side heat medium should be controlled within the range of 0 2 ~ 0. Cm/s.

 

By referring to relevant literature and combining years of experience, the optimal flow rate of plate heat exchanger is given as shown above. Of course, the flow rate is only the theoretical best flow rate, the user should be combined with the actual situation to choose, do not operate blindly.

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