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Classification of heat exchangers

Applicable to different media, different conditions, different temperatures, different pressure heat exchanger, structural type is also different, the heat exchanger specific classification is as follows:
First, the heat exchanger by heat transfer principle classification
1, surface heat exchanger
Surface heat exchangers are two different temperatures in the flow of space separated by the wall, through the wall of the thermal conductivity and fluid flow in the wall surface, between the two kinds of fluid heat exchange. Surface heat exchangers are tube-and-tube, casing and other types of heat exchangers.
2, regenerative heat exchanger
Regenerative heat exchanger through the solid material composition of the regenerator, the heat from the high temperature fluid to the low temperature fluid, heat medium first by heating the solid material to a certain temperature, the cold medium and then through the solid material is heated to achieve heat The purpose of passing. Regenerative heat exchanger with rotary, valve switching and so on.
3, fluid connection indirect heat exchanger
The fluid connection indirect heat exchanger is a heat exchanger that connects two surface heat exchangers by a heat carrier circulating therein, and the heat carrier circulates between the high temperature fluid heat exchanger and the cryogenic fluid and is received at a high temperature fluid Heat, in the low temperature fluid heat exchanger to release the heat to the low temperature fluid.
4, direct contact heat exchanger
Direct contact heat exchangers are two kinds of fluid direct contact with the heat transfer equipment, such as cold water tower, gas condenser and so on.
Second, the heat exchanger by use classification
1, heater
The heater heats the fluid to the necessary temperature, but the heating fluid does not undergo phase change.
The preheater preheats the fluid and provides the standard process parameters for the process operation.
3, superheater
The superheater is used to heat the fluid (process gas or steam) to a superheated state.
4, evaporator
Evaporator for heating the fluid to reach the boiling point above the temperature, so that the fluid evaporates, generally have phase changes.
Third, according to the structure of the heat exchanger classification
Can be divided into: floating head heat exchanger, fixed tube plate heat exchanger, U-tube plate heatexchanger, plate heat exchanger.