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Heat exchangers are classified according to their heat transfer principles.
A heat exchanger is a type of energy-saving equipment used to transfer heat between two or more fluids of different temperatures. It enables heat to be transferred from a fluid with a higher temperature to a fluid with a lower temperature, so that the temperature of the fluids can reach the specified indicators in the process, meeting the requirements of the process conditions. It is also one of the main devices for improving energy utilization efficiency.
1. Wall-type heat exchanger
A wall-type heat exchanger is a device where two fluids with different temperatures flow in a space separated by a wall, and heat exchange occurs between the two fluids through heat conduction through the wall and convection of the fluids on the wall surface.
Wall-type heat exchangers include shell-and-tube type, tubular type and other types.
2. Regenerative heat exchanger
The regenerative heat exchanger transfers heat from a hot fluid to a cold fluid through a heat storage body composed of solid substances. The hot medium first reaches a certain temperature by heating the solid substances, and then the cold medium is heated by passing through the solid substances to achieve the purpose of heat transfer.
3. Fluid connection indirect heat exchanger
A fluid connection indirect heat exchanger is a heat exchanger that connects two surface-type heat exchangers through a circulating heat carrier. The heat carrier circulates between the high-temperature fluid heat exchanger and the low-temperature fluid heat exchanger. The high-temperature fluid receives heat, and the low-temperature fluid heat exchanger releases heat to the low-temperature fluid.
4. Direct contact heat exchanger
Also known as a mixed heat exchanger, this type of heat exchanger is a device where two fluids directly contact and mix to exchange heat. For example, cooling towers and gas condensers.
5. Compound heat exchanger
It is a device that combines both steam-water surface indirect heat exchange and water-water direct mixed flow heat exchange. Compared with steam-water surface indirect heat exchange, it has higher heat exchange efficiency; compared with water-water direct mixed heat exchange, it has higher stability and lower unit noise.
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