Control method for reducing condensation risk of air conditioner indoor unit

Abstract

The invention discloses a control method for reducing the condensation risk of an air conditioner indoor unit. After an air conditioner continuously operates for a first preset time period t1, a humidity detection unit detects and obtains the real-time relative humidity RH1 every time the air conditioner operates for a second preset time period t2, the real-time relative humidity RH1 obtained through current detection and a first preset humidity value are calculated and compared, and if the real-time relative humidity RH1 obtained through current detection is smaller than the first preset humidity value, the air conditioner is operated according to a preset mode; and when the real-time relative humidity RH1 obtained through current detection is larger than or equal to the first preset humidity value, the current relative humidity change rate theta is calculated based on the real-time relative humidity RH1 obtained through detection and the indoor initial relative humidity RH0, primaryadjustment control is conducted on the operation mode of the indoor unit according to the relative humidity change rate theta, and the condensation risk of the indoor unit is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control method for reducing the risk of condensation in an indoor unit of an air conditioner. Background technique [0002] At present, during the cooling process of air conditioners, condensation often occurs, causing water dripping from the tuyere, dripping from the ceiling, damp and moldy walls, and even wall paint falling off, etc., which not only affects the appearance of home decoration, but also affects the use of air conditioners. Condensation is common in the following situations: 1) In summer in coastal areas or during the rainy season in southern China or when users do not close doors and windows, a large amount of air with high humidity enters the room, which can easily lead to condensation during the cooling process of the air conditioner . 2) In a multi-connection system, one outdoor unit is equipped with multiple indoor units, often only a small number ...

AI Technical Summary

Problems solved by technology

[0002] At present, during the cooling process of the air conditioner, condensation often occurs, causing water dripping from the tuyere, ceiling dripping, damp and moldy on the wall, and even wall paint falling off, etc., which not only affects the appearance of the home decoration, but also affects the use of the air conditioner

Condensation is common in the following situations: 1) In summer in coastal areas or during the rainy season in southern China or when users do not close doors and windows, a large amount of air with high humidity enters the room, which can easily lead to condensation during the cooling process of the air conditioner

2) In a multi-connected system, one outdoor unit is equipped with multiple indoor units, often only a small number of indoor units are turned on, resulting in excessive cooling capacity, too small air volume, and condensation.

3) The installation of the indoor unit is not standardized, resulting in air leakage due to gaps, and the drainage of the indoor unit causes the condensed water in the water tray to be taken out by the fan, etc., which will cause condensation

That is to say, the air outlet temperature must be higher than the dew point temperature of 24.3°C, and the indoor unit will not enter the anti-condensation control. However, under condensation conditions, the temperature in the middle of the evaporator is about 8°C, and the outlet air temperature will reach 10-13°C. both are contradictory

And if you really want to adjust the air outlet temperature to above 24.3°C, there will be no cooling effect at all at an ambient temperature of 27°C

In fact, the air in front of and behind the wind wheel at the air outlet is cold. If the doors and windows are closed tightly and the indoor unit does not leak air due to gaps, the possibility of condensation will decrease as time goes by.

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