Method for controlling rotating speed of outer fan of multi-split air conditioner

Abstract

The invention discloses a method for controlling the rotating speed of an outer fan of a multi-split air conditioner. The initial rotating speed after the fan is started is determined according to the outdoor environment temperature; in the refrigerating process, the higher the outdoor environment temperature is, the higher the initial rotating speed of the outer fan is; in the heating process, the higher the outdoor environment temperature is, the lower the initial rotating speed of the outer fan is; in the refrigerating process of the air conditioner, the rotating speed of the outer fan is regulated by detecting the high pressure; a high pressure target value is set according to the outdoor environment temperature; the higher the outdoor environment temperature is, the higher the high pressure target value is; and in the heating process of the air conditioner, the rotating speed of the outer fan is regulated by detection the low pressure. According to the invention, the target pressure range is set according to the outdoor environment temperature, so that the control is more reasonable and the reliability and the energy efficiency ratio of a system are improved.

Description

technical field [0001] The invention relates to a method for controlling the rotational speed of a multi-connected outdoor fan. Background technique [0002] The multi-connected air-conditioning system only entered the Chinese market in the 1990s. With its advantages of free control, high efficiency and energy saving, and easy installation and maintenance, it quickly occupied an important position in the central air-conditioning market. The load of the multi-connected system varies greatly, mainly because one outdoor unit system is connected to multiple indoor units, and 1 to N indoor units can be turned on in actual use; the ambient temperature of the outdoor unit varies greatly throughout the year. The load of the multi-line system varies greatly, requiring the multi-line control system to achieve wide-range adjustment. In addition to the wide-range adjustment of the frequency of the inverter compressor and the flow rate of the electronic expansion valve, the adjustment of...

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Problems solved by technology

[0005] The method of adjusting the heat exchange area of ​​the condenser is rarely used at present because it needs to add a lot of system pipelines and valves, the system is more complicated and the cost is increased; the method of adjusting the speed of the external fan is very common at present, mainly through the external unit coil temperature Although the method of adjusting the speed of the external fan is very simple and easy to implement, the coil temperature has a hysteresis effect and the response is relatively slow. It is difficult to quickly control the system by judging the temperature of the external unit coil to adjust the external fan.

Moreover, it is difficult for the temperature of the external unit coil to accurately reflect the load of the multi-split system, and it is difficult to achieve precise control of the system by judging the temperature of the external unit coil to adjust the external fan

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