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How to divide the heat exchanger according to the heat transfer principle and the characteristics of the plate heat exchanger
Oct 30, 2018

The heat exchanger, which is a widely used product, can be used in the industry and the field, mainly through heat exchange to achieve heat exchange. Therefore, it is necessary to use it correctly and reasonably to achieve the purpose of use, so as to prevent the heat exchanger from functioning properly, and the use of the product can also have a good use effect.


1. The heat exchanger is divided according to the heat transfer principle. What can be divided into?

The heat exchanger is divided according to the heat transfer principle and can be divided into the following types, which are:


Inter-wall heat exchanger: Two fluids with different temperatures flow in a space separated by a wall surface, and heat is exchanged by heat conduction of the wall surface and convection of the fluid on the wall surface. In terms of specific types, it has a shell-and-tube type, a sleeve type, etc., and its application is very extensive.

Regenerative heat exchanger: It is a kind of regenerator by solid matter, which transfers heat from high-temperature fluid to low-temperature fluid for heat conduction to achieve heat transfer. In specific types, there are rotary type and valve. Switching and so on.

Fluid-connected indirect heat exchanger: it connects two surface heat exchangers through a heat carrier, and the heat carrier circulates between a high-temperature fluid heat exchanger and a low-temperature fluid heat exchanger, and is accepted in a high-temperature fluid heat exchanger. Heat, which releases heat in the cryogenic fluid heat exchanger.

Direct contact heat exchanger: It can also be called a hybrid heat exchanger, which is a kind of heat exchange equipment in which two fluids are directly contacted for mixing.


2. Selection and characteristics of plate heat exchangers in heat exchangers


Plate heat exchanger, which is a kind of heat exchanger used more, in the product selection, mainly pay attention to two aspects, which are specifically:

Plate type selection: plate type of plate heat exchanger, there are two types of plate form and corrugated form, which should be determined according to the actual needs of heat exchange. If the flow rate is large but the pressure drop is small, the plate with small resistance should be selected. Type, and vice versa, use a plate with high resistance. When determining the plate type, it should also be noted that it is not appropriate to select a plate with too small a single plate area, so as not to make the heat transfer coefficient of the heat exchanger too low.

Process selection: The process combination should be determined based on the calculation results of heat transfer and fluid resistance, and a good heat transfer effect should be obtained as much as possible.


The characteristics of the plate heat exchanger are:

High efficiency and energy saving: its heat transfer coefficient is 3000-4500kcal/m2·°C·h.

Compact structure: The plates are closely arranged, all of which can reduce the footprint.

Convenient for cleaning and disassembly: This type of heat exchanger clamps the plate by means of a clamping plate, so it can be easily disassembled and cleaned.

Long service life: Because it is made of stainless steel or titanium alloy, it has good corrosion resistance and can guarantee and extend the service life of the product.

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