Control method of multi-split system and multi-split system

Abstract

The invention provides a control method of a multi-split system and the multi-split system. The multi-split system comprises at least one outdoor unit and a plurality of indoor units. The control method comprises the following steps: an actual evaporation temperature of a heat exchanger in the target indoor unit is detected in refrigeration mode; when the actual evaporation temperature approachesa target evaporation temperature, whether a saturation temperature corresponding to a high-pressure is continuously less than or equal to an ambient temperature T4+A in a first preset time is judged;and if so, a compressor is controlled to enter a forced refrigeration correction mode, so that operation frequency of the compressor is adjusted according to a target condensation temperature of the heat exchanger in the outdoor unit, and therefore an actual condensation temperature is close to a target condensation temperature. According to the control method of the multi-split system and the multi-split system, forced refrigeration of the multi-split system in states such as a similar low-refrigerant state can be realized, system fast cooling performance is improved, the refrigerating effectis improved, and further comfort of the system is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a control method of a multi-connection system and the multi-connection system. Background technique [0002] For the air conditioning system, it is more and more difficult to ensure the safety of the system with wide frequency operation. In the low refrigerant system, the high pressure and low pressure established after the operation is stable will be lower than the high pressure and low pressure established by the normal refrigerant system. However, when the traditional multi-connected system controls the output of the compressor, it only controls the low pressure as the target value, and for the reliability of the system, there is a minimum limit for the low pressure as the target value. During the operation of the system, when the saturation temperature of the high pressure reaches a certain difference compared with the ambient temperature, the external heat e...

AI Technical Summary

Problems solved by technology

However, when the traditional multi-connected system controls the output of the compressor, it only controls the low pressure as the target value, and for the reliability of the system, there is a minimum limit for the low pressure as the target value.

During the operation of the system, when the saturation temperature of the high pressure reaches a certain difference compared with the ambient temperature, the external heat exchanger cannot guarantee the effective heat release to the environment, which causes the indoor unit to be unable to effectively absorb heat, causing the indoor unit to Poor cooling effect

In addition, during the operation of the system, it operates according to the target temperature. Under some specific conditions, the amount of refrigerant participating in the circulation during cooling will be relatively small, so that the system will operate with less refrigerant, resulting in poor cooling effect and reduced comfort.

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