Variable refrigerant flow system and low-temperature control method thereof

Abstract

The invention discloses a variable refrigerant flow system and a low-temperature control method thereof. The method comprises the following steps of obtaining the current operating mode of the variable refrigerant flow system; if the current operating mode of the variable refrigerant flow system is a pure refrigeration mode, obtaining the current outdoor environment temperature and judging whetherthe current outdoor environment temperature is smaller than or equal to the first preset temperature or not; and if the current outdoor environment temperature is smaller than or equal to the first preset temperature, obtaining the evaporation temperature of at least one indoor unit of multiple indoor units and the preset target evaporation temperature and controlling the opening degree of a throttling assembly according to the evaporation temperature of at least one indoor unit of multiple indoor units and the preset target evaporation temperature. By means of the low-temperature control method, during low-temperature refrigeration, the low pressure of a refrigeration indoor unit is prevented from being too low by controlling the opening degree of the throttling assembly arranged on a low-pressure air pipe of a throttling device, so that the refrigeration indoor unit is effectively prevented from freezing, the refrigeration indoor unit can conduct refrigeration continuously, and therefrigeration effect is ensured.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a low temperature control method of a multi-connection system and a multi-connection system. Background technique [0002] Generally, in spaces with continuous heat sources such as computer rooms and kitchens, the air-conditioning system is required for low-temperature cooling. If the condensation effect is too good, the refrigerant in the indoor evaporator cannot be completely evaporated, which will cause the system to return to liquid refrigerant, and in severe cases, the compressor will burn out. At the same time, because the high pressure in the outdoor unit is low, the low pressure also becomes low. If the indoor low pressure is too low, it will cause the evaporator on the indoor side to prevent freezing, which will make the system unable to continue cooling and affect the cooling at low temperatures. Effect. Contents of the invention [0003] The present invent...

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Problems solved by technology

[0002] Generally, in spaces with continuous heat sources such as computer rooms and kitchens, the air-conditioning system is required for low-temperature cooling. The condensation effect is so good that the refrigerant in the indoor evaporator cannot be completely evaporated, which will cause the system to return to liquid refrigerant, and in sever...

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