The invention discloses a low-temperature heating
refrigerant flow rate matching control method and an air conditioner. The low-temperature heating
refrigerant flow rate matching control method comprises the following steps that S1, the air conditioner enters a heating mode, whether a condition of entering
defrosting control is achieved or not is judged, and if the condition is achieved, S2 is executed; S2, the air conditioner performs
defrosting operation, when
defrosting is finished, an
electronic expansion valve recovers an initial opening degree, defrosting timing is started, and after thedefrosting time is achieved with defrosting timing, S3 is executed; S3, valve regulation timing is started; S4, after a regulation time of the expansion valve is achieved with regulation timing, theelectronic expansion valve performs one-step valve closing, and whether the opening degree of the
electronic expansion valve is declined to a
lower limit opening degree or not is judged, and if the opening degree of the
electronic expansion valve is not declined to the
lower limit opening degree, S5 is executed; S5, whether the condition of entering defrosting control is achieved or not is judged,and if the condition is achieved, S6 is executed; S6, the opening degree of the electronic expansion valve is kept invariable; and S7, when the condition of entering defrosting control is achieved ornot is judged, the step S2 is executed, or otherwise, the step 6 is executed. By adopting the low-temperature heating
refrigerant flow rate matching control method provided by the invention, the refrigerant flow rate in the defrosting process and the heat exchange ability of an
evaporator perform dynamic matching, the low-temperature heating ability is improved, the defrosting period is prolonged, the
energy consumption is lowered,
noise pollution is reduced, and the use comfort is improved.