A Precise Control Method for Multi-line System

Abstract

The invention discloses a precise control method for a multi-connected system. The multi-connected system includes an outdoor unit and an indoor unit composed of several indoor units, wherein each indoor unit is equipped with an electronic expansion valve, and each indoor unit is equipped with an electronic expansion valve. The above-mentioned indoor unit can be arbitrarily switched between the working modes of the ordinary air duct machine or the fresh air blower according to the demand; the control method is as follows: detecting the running status of the multi-connected system and the operation of the indoor Quantity, as well as the corresponding working mode of each indoor unit, and then according to the detection situation, correspondingly adjust the opening degree of the electronic expansion valve of each indoor unit that is powered on, and realize the mixing and matching of fresh air fans and ordinary air duct units in the same multi-line In the system, through reasonable and accurate dynamic adjustment of the electronic expansion valve opening of the indoor unit, the reasonable refrigerant adjustment of the indoor unit is realized, so as to ensure the outlet air temperature of the fresh fan and the ordinary ducted unit, and achieve the same temperature as the fresh fan and the ordinary ducted unit. Comfortable air supply temperature.

Description

technical field [0001] The present invention relates to the technical field of multi-connection systems, in particular to a precise control method for multi-connection systems. 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 outdoor am...

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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