Defrosting control method for variable frequency heat pump air conditioner and outdoor heat exchanger system

By using superhydrophobic aluminum foil fins and intelligent control strategies in heat pump air conditioners, the problems of reduced heat exchange efficiency and indoor temperature fluctuations caused by condensate and frost have been solved, achieving efficient and stable heating and defrosting processes and extending the life of system components.

CN120969989APending Publication Date: 2025-11-18SICHUAN CHANGHONG AIR CONDITIONER CO LTD
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Patent Information

Application Number
CN202511313178.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-15
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing heat pump air conditioners suffer from condensation affecting heat exchange efficiency during winter heating, frost formation leading to reduced heating capacity, and the reverse defrosting process causing indoor temperature fluctuations and system reliability issues.

Method used

Employing superhydrophobic aluminum foil fins and intelligent control strategies, it promotes rapid condensation at high temperatures and uses high-temperature refrigerant to directly defrost at low temperatures, avoiding the reversal of the four-way valve and maintaining a constant heating cycle.

Benefits of technology

It improves heat exchange efficiency and heating capacity, reduces indoor temperature fluctuations, extends the lifespan of key components, and enhances system reliability and user comfort.

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Abstract

The invention relates to the technical field of air conditioners, discloses a defrosting control method for a variable frequency heat pump air conditioner and an outdoor heat exchanger system, and aims to solve the problems that condensate water affects the heat exchange efficiency and the indoor temperature fluctuates in an existing heat pump air conditioner. The super-hydrophobic fins of the outdoor heat exchanger promote the condensed water to fall off quickly so as to maintain the heat exchange efficiency; when it is detected that the temperature of the outdoor heat exchanger is continuously lower than 0 DEG C and reaches a first preset time threshold value, a defrosting mode is controlled to be started; in the defrosting mode, the expansion valve is controlled to be opened to the maximum opening degree so as to reduce or stop throttling, the air speed of the indoor fan is reduced, and meanwhile the heating flow direction of the four-way valve is kept unchanged; and when it is detected that the temperature of the outdoor heat exchanger is continuously higher than 0 DEG C and reaches a second preset time threshold value, the defrosting mode is controlled to exit, and normal control is recovered. According to the invention, the energy efficiency and reliability during conventional operation are improved, and the indoor temperature fluctuation during defrosting is reduced.
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