Control method of mixed matching multi-split air conditioning system

Abstract

The invention discloses a control method of a mixed matching multi-split air conditioning system. The control method comprises the following steps that A, when each indoor unit is powered on and operates initially, the initial opening degree and opening degree adjusting range of an electronic expansion valve of each indoor unit are calculated and determined on basis of the capacity condition and the current working mode of each indoor unit; B, each indoor unit subjected to power-on initial operation correspondingly adjusts the electronic expansion valve of each indoor unit to target opening degree within the opening degree adjusting range according to the difference value, obtained in real time, between a heat exchanger inlet temperature TA and a heat exchanger outlet temperature TB and bytaking the initial opening degree as the starting point; and C, each indoor unit subjected to primary adjustment correspondingly adjusts the electronic expansion valve of each indoor unit to the target opening degree within the opening degree adjusting range by taking the target opening degree subjected to primary adjustment as the starting point based on the difference value between a real heatexchanger inlet temperature TA and a real heat exchanger outlet temperature TB obtained in real time.

Description

technical field [0001] The present invention relates to the technical field of multi-connection systems, in particular to a control method for a mixed-matching multi-connection system. Background technique [0002] The return air of the indoor unit of the general air conditioner is the wind in the indoor room. This kind of wind has been circulating indoors and is generally not fresh. A comfortable indoor environment usually requires a certain amount of fresh air entering the room through the outside. Fan to get fresh air. [0003] The air return port of the fresh fan of the air conditioner needs to be connected to the air port to introduce fresh air from the outdoor side to the indoor room. Usually, when the ambient temperature outside the single room is higher than that of the indoor room (for example, the ambient temperature of the outdoor unit is 40°C, while the indoor ambient temperature is 27°C) , the return air temperature of the indoor unit of the fresh fan is the ou...

AI Technical Summary

Problems solved by technology

Due to the large difference between the return air temperature of the fresh fan and the return air temperature of the ordinary indoor unit, if the fresh fan and the ordinary indoor unit are installed in the same system, they will usually affect each other. The temperature should not be too high. On the one hand, the temperature of the air sent by the ordinary indoor unit should not be too high. If it is too high, the human body will not feel cool.

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