Shell and tube heat exchanger

Abstract

The invention relates to a shell and tube heat exchanger. The shell and tube heat exchanger has the advantages that the ratio of the shell side size to the heat exchanging area is small, the air or low-viscosity liquid can serve as a heat exchanging medium, the entire process is free of dead band, short circuit and turbulence, maximum temperature gradient coaxial and reverse heat exchange with a tube side refrigerant medium is performed, the heat exchanger can be oppositely opened and is convenient to open and close, physical descaling and cleaning are performed on a shell side and a tube side, and the air or low-viscosity liquid medium can be automatically switched and exchanges heat with a tube side refrigerant.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger, which belongs to the technical field of heat exchangers. Background technique [0002] The finned heat exchangers used in domestic air conditioners rely on compressors for refrigeration and heating. The finned heat exchangers have a mature manufacturing process and a single application function. Arrange the fins in a rectangle and then pass the axial flow fan to force the air to exchange heat with the fins for the second time. At the same time, the cylindrical air flow of the axial flow fan will cause heat exchange dead angle to the non-circular fin heat exchanger and cannot make the two The phase medium is coaxial and reversed with the maximum temperature gradient method for high-efficiency heat exchange. The outdoor side fins are affected by air oxidation, dust, and water mist erosion all day long, and cannot be cleaned by physical methods. We can only rely on the design process to increase th...

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Problems solved by technology

[0002] The finned heat exchangers used in domestic air conditioners rely on compressors for refrigeration and heating. The finned heat exchangers have a mature manufacturing process and a single application function. Arrange the fins in a rectangle and then pass the axial flow fan to force the air to exchange heat with the fins for the second time. At the same time, the cylindrical air flow of the axial flow fan will cause heat exchange dead angle to the non-circular fin heat exchanger and cannot make the two The phase medium is coaxial and reversed with the maximum temperature gradient method for high-efficiency heat exchange. The outdoor side fins are affected by air oxidation, dust, and water mist erosion all day long, and cannot be cleaned by physical methods. We can only rely on the design process to increase the fins in advance. The abundance of the heat exchange area of ​​the fins and the increase in the volume of the heat exchange diffusion space cannot offset the continuous reduction of heat exchange efficiency due to dirt because there is no economical and convenient physical cleaning and descaling means for non-erosion fins, so it can only be left to the refrigeration equipment. The energy efficiency ratio decreases continuously with the increase of the use time due to non-compressor reasons. Most of the heat energy of the outdoor side fin heat exchanger is consumed by the surrounding cold air during the electric defrosting process in winter, and the cold and hot sides of the refrigeration equipment pass through the reversing valve. The heat energy required for defrosting when switching over to perform defrosting operations, including the heat energy consumed by part of the outdoor air convection cooling energy during defrosting operations, must be provided by the conversion of indoor heat sources. The result is the finned heat exchanger itself. and the extension of the single application function attribute

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