Control method and device for outlet air temperature of air conditioner indoor unit

Abstract

The invention discloses a control method and device for the outlet air temperature of an air conditioner indoor unit. The method comprises the first step of receiving a current heat exchanger temperature T2 (n) detected by a temperature sensor arranged in an indoor heat exchanger, and judging whether the absolute value of the difference value between T2 (n) and a heat exchanger temperature T2 (n-1) detected last time is smaller than a preset difference value extreme value D or not, the second step of judging whether T2 (n) is within a preset temperature interval corresponding to an air volume stable region when the inequation |T2 (n)-T2 (n-1)|<D is satisfied, the third step of adjusting the outlet air volume of an air conditioner correspondingly according to the temperature interval corresponding to an air volume adjustment region where T2 (n) is located when T2 (n) is not within the temperature interval corresponding to the air volume stable region. By means of the method, a high outlet air temperature is reached quickly and kept constant, fluctuation of the indoor temperature and the outlet air temperature is reduced, the defect that the outlet air temperature of the air conditioner is low due to a low outdoor temperature is overcome, and the comfort level of users using the air conditioner is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method and device for controlling the outlet air temperature of an indoor unit of an air conditioner. Background technique [0002] When the heat pump air conditioner is running in the heating mode, the refrigerant evaporates in the outdoor heat exchanger, exchanges heat with the outdoor air through the heat exchanger, absorbs heat from the outdoor air, and this part of the heat is carried by the refrigerant into the indoor heat exchanger , through the condensation process of the refrigerant in the indoor heat exchanger, heat is released to heat the indoor air, so that people can enjoy a more comfortable environment. [0003] Since the refrigerant needs to absorb heat from the outdoor air, when the outdoor temperature gradually decreases, the heat exchange capacity of the outdoor heat exchanger will decrease, and the evaporation pressure of the refrigerant will also de...

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Problems solved by technology

[0003] Since the refrigerant needs to absorb heat from the outdoor air, when the outdoor temperature gradually decreases, the heat exchange capacity of the outdoor heat exchanger will decrease, and the evaporation pressure of the refrigerant will also decrease, which affects the ability of the refrigerant to absorb heat from the outdoor air. capacity, resulting in a decrease in the heat transferred to the interior

Since the air volume of the indoor unit is constant, even if the indoor return air temperature is kept constant, the drop in the outlet air temperature cannot be avoided. will seriously affect people's comfort

Even if the outdoor ambient temperature remains the same, when the outdoor ambient temperature is low, the outdoor heat exchanger will have a frosting process when the heat pump air conditioner is heating, and as the frost layer thickens, the heat transfer capacity of the outdoor heat exchanger will decrease. With the drop, the air outlet temperature will also drop at this time, which will affect people's comfort

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