Micro-channel heat exchanger and uniform defrosting control method thereof

Abstract

The invention discloses a micro-channel heat exchanger and a uniform defrosting control method thereof. The micro-channel heat exchanger comprises a liquid collecting pipe, a partition plate, a flat pipe, a fin and two flow regulating valves; the micro-channel heat exchanger judges whether entering a defrosting mode through the temperature measured by a first temperature sensor, a refrigerant flows into the upper portion and the lower portion of the heat exchanger through the two flow regulating valves in the defrosting mode, the whole uniform defrosting of the heat exchanger is achieved, theopening degree of the two flow regulating valves is controlled by using the output signals of two temperature sensors through a control module, and the micro-channel heat exchanger is further ensuredto be uniformly defrosted in a the fixed point mode, and in addition, the micro-channel heat exchanger judges whether exiting the defrosting mode through the output signals of the two temperature sensors. Compared with the prior art, the micro-channel heat exchanger can solve the situation that the lower defrosting of a traditional microchannel heat exchanger is relatively slow and more residual water exists, the upper and lower parts of the micro-channel heat exchanger are uniformly defrosted, the defrosting time is shortened, and the overall performance of the microchannel heat exchanger isimproved.

Description

technical field [0001] The invention relates to the technical field of microchannel heat exchangers, in particular to a microchannel heat exchanger and a uniform defrosting control method thereof. Background technique [0002] Compared with the traditional finned tube heat exchanger, the microchannel heat exchanger has the advantages of high heat transfer efficiency, small volume, compact structure, small refrigerant charge, and low production cost. As a condenser of the refrigeration system, it has been obtained Large-scale use, but when it is used as an evaporator of air source heat pumps and heating and cooling household air conditioners, it has disadvantages such as fast frosting speed, difficult to remove defrosting water, long defrosting time, and rapid capacity decay, which restricts its use in Popularization and application of heat pumps and heating and cooling household air conditioners. [0003] In the case of frosting, the conventional micro-channel heat exchange...

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Problems solved by technology

[0002] Compared with the traditional finned tube heat exchanger, the microchannel heat exchanger has the advantages of high heat transfer efficiency, small volume, compact structure, small refrigerant charge, and low production cost. As a condenser of the refrigeration system, it has been obtained Large-scale use, but when it is used as an evaporator of air source heat pumps and heating and cooling household air conditioners, it has disadvantages such as fast frosting speed, difficult to remove defrosting water, long defrosting time, and rapid capacity decay, which restricts its use in Popularization and application of heat pumps and heating and cooling household air conditioners

[0003] In the case of frosting, the conventional micro-channel heat exchanger starts to frost from the bottom of the micro-channel heat exchanger, and then the frost layer starts to grow from the bottom up, and the defrosting starts from the upper part of the micro-channel heat exchanger. And the defrosting starts at the bottom, which leads to thicker frosting on the lower part of the micro-channel heat exchanger. uneven

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