Cascade evaporation and condensation heat exchanger

Abstract

The invention relates to a cascade evaporation and condensation heat exchanger. The cascade evaporation and condensation heat exchanger comprises at least one heat exchange unit, wherein each heat exchange unit is of a plate-shaped structure formed by arranging a plurality of condensation pipe horizontal sections, at least one refrigerant heat exchange channel is formed, and the two faces of eachplate-shaped structure form an evaporation heat exchange face; a cooling outer pipe is further arranged above the condensation pipe horizontal section on the uppermost side; a water distribution groove is further formed between the cooling outer pipe and the condensation pipe horizontal sections; water distribution micropore plates are arranged on the two sides of the water distribution groove; the upper ends and the lower ends of the water distribution micropore plates are connected with the pipe wall of the cooling outer pipe and the pipe wall of the condensation pipe horizontal sections correspondingly; the cooling outer pipe is provided with a plurality of water outlet holes communicating with the water distribution groove; and a cooling inner pipe is further arranged in each refrigerant heat exchange channel in a penetrating manner. The cascade evaporation and condensation heat exchanger integrates two heat exchange manners of water cooling heat exchange and evaporation cooling heat exchange, and the cascade heat exchange effect is shown; the embedded hidden type water distribution groove can form the water curtain type water distribution effect, and the evaporation efficiencyis improved; and free water cannot be generated, and the phenomena of water flying and water floating are avoided.

Description

technical field [0001] The invention relates to the field of condensation heat exchangers, in particular to a cascade evaporation condensation heat exchanger. Background technique [0002] Water-cooled air conditioners have significant cooling efficiency compared with air-cooled air conditioners, so they are the first choice in the field of central air-conditioning refrigeration. However, due to the large size of the water-cooled air conditioner, it is not easy to install, transport, and maintain. In particular, it occupies a large area of ​​indoor space and causes a waste of construction. Therefore, the small modularization of the unit will become an inevitable trend in the development of water-cooled chillers. However, the shell-and-tube condensers or evaporative condensers commonly used in existing water-cooled chillers have problems such as large volume, low efficiency, and "flying water" phenomenon that causes serious waste of water cooling water, which restricts the m...

AI Technical Summary

Problems solved by technology

This will increase the size of the air conditioning unit, and the increase in manufacturing cost is not conducive to the miniaturization of the unit; the cooling water sprayed downwards during the cooling process and the air under negative pressure in the unit cavity produce a countercurrent, resulting in a large amount of "flying water" and "drifting water" Phenomenon that wastes water resources and reduces cooling efficiency

[0006] Whether it is an evaporative-condensing heat exchanger or a water-cooled shell-and-tube heat exchanger, it has a single cooling medium and a single heat exchange surface partition wall heat exchange structure. The cooling medium and the refrigerant realize heat exchange through the tube wall between the two media. This structure Limiting the heat transfer surface between the two media is not conducive to heat transfer

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