The principle of plate heat exchanger design

The principle of plate heat exchanger design


Plate heat exchanger as a typical heat transfer equipment, the heat transfer station has a very important significance. In this paper, the design of plate heat exchanger is analyzed.
Select the corrugated plate type: the corrugated plate type is mainly chevron and horizontal flat corrugated two. The pressure capacity of the chevron plate can be higher than 1.0MPa, the horizontal flat corrugated plate pressure capacity is generally about 1.0MPa; chevron corrugated plate heat transfer coefficient and fluid resistance are higher than the level of flat corrugated Plate. Select the type of corrugated plate, the main consideration to the plate heat exchanger working pressure, fluid pressure drop and heat transfer coefficient. If the working pressure in the 1.6MPa or more, then no choice to use the chevron-shaped corrugated plate; if the working pressure is not high and particularly require resistance to reduce the use of horizontal flat corrugated plate better; if the installation location , The need for high heat transfer efficiency to reduce the area of ​​the heat exchanger, and resistance can be unrestricted, you should use the chevron plate. Plate type or corrugated type should also be based on the actual needs of heat transfer may be. Large allowable pressure drop on the flow of small, should use a small resistance plate type, and vice versa use the resistance of the plate type.
Flow rate selection: the flow rate of the fluid between the plates, the impact of heat transfer performance and fluid pressure drop, high flow rate, although the heat transfer coefficient is high, but the resistance of the fluid is also increased; the contrary, the opposite. The average velocity of the plate is 0.2 ~ 0.8m s. When the flow rate is less than 0.2m s, the fluid will not reach the turbulent state and the larger dead zone will be formed. If the flow rate is too high, the resistance will increase. Specific design, you can determine a flow rate, calculate its resistance drop is within a given range; can also be given a pressure drop to find the initial value of the flow rate.

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