Micro-channel evaporator and working method thereof

Abstract

The invention discloses a micro-channel evaporator and a working method thereof. The micro-channel evaporator comprises a liquid collecting pipe, flat pipes, fins, a partition plate, a first distribution pipe and a second distribution pipe. In the actual application of a micro-channel evaporator, the refrigerant flow has a large-range change, the structure of a conventional distribution pipe is fixed, and the effect of distributing two-phase refrigerants with different flows is not optimal, so that the invention provides a distribution pipe with variable distribution hole number and position. According to the micro-channel evaporator, refrigerants can be distributed more evenly under different flow rates, and under the small flow rate of the refrigerants, the flow path of the refrigerants can be changed, the side pressure drop of the refrigerants is reduced, and the heat exchange performance of the micro-channel evaporator is improved.

Description

technical field [0001] The invention relates to the technical field of microchannel evaporators, in particular to a microchannel evaporator and a working method thereof. Background technique [0002] Microchannel heat exchangers have been widely used in the field of refrigeration and air conditioning due to the advantages of high heat exchange efficiency, small size, compact structure, small refrigerant charge, and low production cost, but microchannel heat exchangers are used as evaporators. When the two-phase refrigerant enters the liquid collector, the liquid phase of the two-phase refrigerant will be separated, and the refrigerant entering the flat tube will be seriously uneven, which will seriously affect the heat exchange performance of the heat exchanger. . [0003] The conventional micro-channel evaporator is to add a distribution tube to the liquid header to improve the distribution of the two-phase refrigerant. The distribution structure of the distribution tube i...

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Problems solved by technology

[0002] Due to the advantages of high heat exchange efficiency, small size, compact structure, small refrigerant charge, and low production cost, micro-channel heat exchangers have been used in the field of refrigeration and air conditioning It has been widely used, but when the microchannel heat exchanger is used as an evaporator, the two-phase refrigerant entering the liquid collection pipe will have a phenomenon of liquid phase separation, and the refrigerant entering the flat tube will have serious irregularities. Uniform phenomenon, which seriously affects the heat transfer performance of the heat exchanger

[0003] Conventional micro-channel evaporators add distribution pipes to the liquid collection pipes to improve the distribution of two-phase refrigerants. The distribution structure of the distribution pipes is usually fixed. Although the method can effectively improve the uniformity of liquid separation, as the refrigerant flow rate changes, the distribution structure of the distribution pipe cannot match the refrigerant flow rate well, and cannot meet the optimal distribution under different refrigerant flow rates.

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