Air conditioning refrigeration system and control method

Abstract

The invention relates to an air conditioning refrigeration system. The air conditioning refrigeration system comprises an evaporator, a compressor, a throttling valve and a condenser which are communicated in sequence, wherein the throttling valve is arranged between the evaporator and the condenser. The air conditioning refrigeration system further comprises a bypass branch in parallel connection with the throttling valve and an on-off valve capable of opening or closing the bypass branch. The invention further relates to a control method of the air conditioning refrigeration system. According to the air conditioning refrigeration system, the additional on-off valve connected to the position of a traditional throttling valve in parallel is adopted between the evaporator and the condenser, so that under the situation that the cost is effectively controlled, refrigerating output is adjusted to improve refrigerating capacity of a unit according to different operation situations. In addition, under the situation that outdoor temperature is low, the air conditioning refrigeration system can also timely regulate evaporating pressure and improve the operation reliability of an air conditioner in a machine room when the outdoor temperature is low.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning refrigeration system and a control method. Background technique [0002] Refrigeration system throttling devices are often used on air-conditioning units in computer rooms. The throttling device plays a very critical role in the system. It is an important part of reducing energy consumption of the entire refrigeration equipment to choose and apply the appropriate throttling mechanism to match the refrigeration system. However, the existing technology is often affected by the specifications of the throttling system. When the cooling demand of the system is large, the traditional throttling device often cannot meet the adjustment demand, which will cause insufficient cooling capacity of the computer room air conditioner with a large cooling capacity. In the case of unsatisfactory operating parameters of the whole machine, replacing the throttling syste...

AI Technical Summary

Problems solved by technology

However, the existing technology is often affected by the specifications of the throttling system. When the cooling demand of the system is large, the traditional throttling device often cannot meet the adjustment demand, which will cause insufficient cooling capacity of the computer room air conditioner with a large cooling capacity. In the case of unsatisfactory operating parameters of the whole machine, replacing the throttling system according to different refrigeration capacities will also increase the manufacturing cost of the unit and prolong the development cycle of the unit

[0003] In addition, when the outdoor temperature of the computer room air conditioner is low, the compressor may restart after a period of shutdown. Because the outdoor temperature is lower than the temperature in the computer room, the refrigerant will migrate from the evaporator to the condenser. During a period of time when the machine is started, the suction pressure is too low and the compressor suction volume is small, which will reduce the reliability of the compressor operation.

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