The heat exchangers are classified according to the heat transfer principle as follows:
(1) Partition heat exchanger.
In a partition wall heat exchanger, two fluids with different temperatures flow in a space separated by a wall surface. The heat transfer between the two fluids is conducted by heat conduction on the wall surface and convection of the fluid on the wall surface. Divided wall heat exchangers include shell and tube, sleeve and other types of heat exchangers. The partition wall heat exchanger is currently the most widely used heat exchanger.
(2) Regenerative heat exchanger.
The regenerative heat exchanger transfers heat from a high temperature fluid to a low temperature fluid through a heat storage body composed of solid materials. The heat medium first reaches a certain temperature by heating the solid material, and then the cold medium is heated by the solid material to make it reach heat Purpose of delivery. Regenerative heat exchangers have rotary type, valve switching type and so on.
(3) Fluid connection to indirect heat exchanger.
The fluid connection indirect heat exchanger is a heat exchanger that connects two surface heat exchangers with a heat carrier circulating in it. The heat carrier circulates between the high-temperature fluid heat exchanger and the low-temperature fluid and accepts the high-temperature fluid The heat is released to the cryogenic fluid in the cryogenic fluid heat exchanger.
(4) Direct contact heat exchanger.
Also known as a hybrid heat exchanger, this heat exchanger is a device that directly contacts two fluids and mixes with each other for heat exchange, such as a cold water tower and a gas condenser.
(5) Double heat exchanger.
It also has two types of heat exchange equipment: indirect heat exchange between steam-water surface and direct mixed flow heat exchange between water and water. Compared with the indirect heat exchange of steam-water surface, it has higher heat exchange efficiency. Compared with the soda-water direct mixing heat exchange, it has higher stability and lower unit noise.