How to classify the Heat Exchanger?
First, Heat exchanger classificated by usage
1, Heater which heats the fluid to the necessary temperature, but the heating fluid does not undergo phase change.
2, Preheater which preheats the fluid and provides the standard process parameters for the process operation.
3, Superheater which is used to heat the fluid (process gas or steam) to a superheated state.
4, evaporator which is for heating the fluid to reach the boiling point above the temperature, so that the fluid evaporates, generally have phase changes.
Second, Heat exchanger classificated by heat transfer principle
1, the surface type heat exchanger
The surface type heat exchanger, which is different temperature from the flow of two fluids being separated from the wall space, and through the wall of the thermally conductive fluid convective heat transfer between the wall surface. Surface heat exchanger include shell and tube, tube type and other types of heat exchangers.
2, Regenerative heat exchanger
After the regenerative heat exchanger through the regenerator solids formed, the heat transfer from the hot fluid to cold fluid heat medium to reach a certain temperature by heating the solid material is heated by the cold medium and then the solid material, so as to achieve the heat purpose delivery. Regenerative heat exchanger has a rotary valve switched so on.
3, indirect fluid connection heat exchanger
An indirect heat exchanger in fluid connection, the two surfaces of the heat exchanger by the circulating heat carrier in which the heat exchangers are connected, the heat carrier in the heat exchanger between the high temperature fluid and low temperature fluid circulating in the high temperature fluid receiving heat exchanger at low temperature fluid to the heat release cryogenic fluid.
4, the direct connect heat exchanger
Direct connect heat exchanger is two fluids connect direct in heat exchange equipment, such as cooling towers, gas condenser.
5, double heat exchanger
Both gas and water heat transfer or water to water of indirect heat transfer and heat transfer equipment directly mixed two heat mode. Compared with gas and water indirect heat exchange with a higher heat transfer efficiency; compared with gas and water mixed directly with high heat stability and low noise unit.
Third, Heat exchanger classified according to the structure
It can be divided into: floating head heat exchangers, fixed tube plate heat exchanger, U-shaped tube plate heat exchangers, plate heat exchanger.