Heat exchanger for central heating can be divided into the following types.
1. Interwall Heat Exchanger
Inter-wall heat exchangers are two kinds of fluids with different temperatures flowing in the space separated by the wall, through the heat conduction of the wall and the convection of the fluid on the wall, heat transfer between the two kinds of fluids. Inter-wall heat exchangers have shell-and-tube, sleeve and other types of heat exchangers. Interwall heat exchanger is the most widely used heat exchanger at present.
2. Regenerative heat exchanger
The regenerative heat exchanger transfers heat from high temperature fluid to low temperature fluid through the regenerator composed of solid material. The heat medium first reaches a certain temperature by heating solid material, and then the cold medium is heated through solid material to achieve the purpose of heat transfer. The regenerative heat exchanger has rotary type and valve switching type.
3. Fluid connected indirect heat exchanger
Fluid-connected indirect heat exchanger is a heat exchanger with two surface heat exchangers connected by heat carriers circulating in it. The heat carriers circulate between the high-temperature fluid heat exchanger and the low-temperature fluid, receive heat in the high-temperature fluid, and release heat to the low-temperature fluid in the low-temperature fluid heat exchanger.
4. Direct contact heat exchanger
It is also called hybrid heat exchange
r. This kind of heat exchanger is the equipment that two kinds of fluids contact directly and mix with each other for heat exchange, such as cold water tower, gas condenser, etc.
5. Compound heat exchanger
It has two kinds of heat exchangers
: indirect surface heat transfer and direct mixed flow heat transfer. Compared with steam-water surface indirect heat transfer, it has higher heat transfer efficiency. In addition, compared with direct steam-water mixing heat transfer, it has higher stability and lower unit noise.