Control method for multi-split air conditioning unit

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a control method for a multi-split air conditioning unit. The control method aims to solve the problem that the energy efficiency of an existing multi-split air conditioning unit is difficult to greatly improve due to the fact that the control mode of the existing multi-split air conditioning unit on a supercooling valve is not good. Therefore, under the condition that the multi-split air conditioning unit operates under the refrigeration working condition, the control method comprises the steps thatthe outdoor temperature is obtained; the target superheat degree of the multi-split air conditioning unit is determined according to the outdoor temperature; the current superheat degree of the multi-split air conditioning unit is obtained; and according to the current superheat degree and the target superheat degree, the opening degree and / or the adjusting speed of a supercooling valve is controlled. According to the control method for the multi-split air conditioning unit, the target superheat degree is firstly determined according to the outdoor temperature, and then the opening degree and / or the adjusting speed of the supercooling valve is controlled according to the current superheat degree and the target superheat degree so that the supercooling valve can better adjust and control the refrigerant conversion condition in the air conditioning unit, the heat exchange efficiency of the air conditioning unit is improved to the maximum extent, and then the purposes of energy conservation and efficiency improvement are achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a control method for a multi-connected air conditioning unit. Background technique [0002] With the continuous development of air-conditioning technology, users have put forward higher and higher requirements for the heat exchange efficiency of air-conditioning units. For air-conditioning units, various electrical devices that can adjust parameters often determine the heat exchange efficiency of the air-conditioning unit; especially for multi-connected air-conditioning units, the frequency control logic of the inverter compressor and the opening control of each electronic expansion valve Logic often plays a decisive role in the heat exchange efficiency of the entire multi-split air conditioner unit. Taking the multi-connected air-conditioning unit with subcooling valve as an example, the purpose of adding the supercooling valve is to improve the heat exchan...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems in the prior art, that is, to solve the problem that the energy efficiency of the air conditioning unit is difficult to be greatly improved due to the poor control method of the existing air conditioning unit on the subcooling valve, the present invention provides a multi-connected air conditioner The control method of the unit, the multi-connected air-conditioning unit includes a subcooling valve and a frequency conversion compressor, and when the multi-connected air-conditioning unit is operating in the cooling condition, the control method includes: obtaining the outdoor temperature; according to the outdoor temperature Determining the target superheat degree of the multi-connected air-conditioning unit; acquiring the current superheat degree of the multi-connected air-conditioning unit; controlling the opening degree and / or adjust speed

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