Multi-air conditioning system and valve opening controlling method thereof

Abstract

The invention relates to a dual-purpose cooling and heating air-conditioning system and a valve opening control method of the multiple air-conditioning system that connect multiple indoor units to one outdoor unit. When the operating capacity changes or when the operation starts, it can shorten the tracking The optimal opening time of the electronic expansion valve. The specific solution is: the compound air-conditioning system targeted by the control method has multiple indoor units and electronic expansion valves capable of adjusting the degree of superheat and subcooling of the refrigerant flowing into the multiple indoor units, and the above-mentioned electronic expansion valves After the opening is adjusted to a predetermined initial value, judge whether it is the optimal opening. If it is the optimal opening, then judge whether the current opening of the above-mentioned electronic expansion valve is within the range of the initial value. When the current opening is outside the range of the initial value At this time, the deviation between the current opening and the initial value is calculated, and the initial value is corrected using the calculated deviation, thereby controlling the opening of the electronic expansion valve.

Description

technical field [0001] The present invention relates to a dual-purpose cooling and heating dual-purpose air-conditioning system in which multiple indoor units are connected to one outdoor unit, in particular to a complex air-conditioning system that shortens the time required to track the optimum opening of an electronic expansion valve when the operating capacity changes or when the operation starts. A valve opening degree control method for a compound air-conditioning system. Background technique [0002] The air conditioner is a device used to cool or heat the room. By circulating the refrigerant between the indoor unit and the outdoor unit, the liquid refrigerant absorbs the surrounding heat when it vaporizes, and releases the heat when the gas refrigerant liquefies. This is for cooling or heating operation, as for cooling or heating, it is determined by the circulation direction of the refrigerant. [0003] An air conditioner in which one indoor unit is installed on on...

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Problems solved by technology

[0007] However, this existing multi-type air-conditioning system can shorten the time it takes to track the optimum opening of the electronic expansion valve under normal conditions similar to the test state, and when the amount of refrigerant is at In the event of abnormal conditions, long piping conditions, etc., when the piping length changes, or other abnormal conditions different from the test conditions, the initial value must be changed according to the situation.

However, in the existing method, since it is impossible to change the initial value, when the initial value does not correspond to the optimal opening, the time to track the optimal opening increases as shown in Figure 1. In this way, there is During the tracking period, the cooling and heating capacity of the air conditioner is reduced.

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