Control method, device and system for operation of air conditioning refrigeration system under critical condition

Abstract

The invention relates to a control method, device and system for the operation of an air conditioning refrigeration system under a critical condition. The evaporating pressure at the suction port of a compressor and the condensing pressure at an air outlet are acquired to determine the evaporation temperature of a refrigerant in an evaporator and the condensing temperature of a refrigerant in a refrigerator. When the evaporation temperature and the condensing temperature are within a critical evaporation temperature region and within a critical condensing temperature region, the evaporation temperature and the condensing temperature are adjusted by controlling the opening degree of an electronic expansion valve and the operation frequency of the compressor. Effective measures are taken in advance in a pre-determined way. The problem that the compressor cannot work properly, which is caused by the fact that the evaporation temperature or the condensing temperature is not within the required normal range, is avoided.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of air-conditioning and refrigeration systems, and in particular to a control method, device and system for operating an air-conditioning and refrigeration system in a critical state. Background technique [0002] Air conditioning and refrigeration systems generally consist of evaporators, compressors, and condensers. Wherein, the evaporator is located in an indoor environment, the condenser is located in an outdoor environment, and the evaporator and the condenser are communicated through a compressor. When the air conditioning and refrigeration system is running, the compressor compresses the low-pressure gaseous refrigerant sucked from the evaporator into a high-pressure gaseous state, and inputs the high-pressure gaseous refrigerant into the condenser, and condenses the input high-pressure gaseous refrigerant into In the high-pressure liquid state, the state change process of the r...

AI Technical Summary

Problems solved by technology

However, affected by factors such as indoor ambient temperature or outdoor ambient temperature, once the evaporation temperature or condensation temperature of the refrigerant exceeds the allowable temperature range of the refrigeration system, it will seriously affect the normal operation of the air conditioning and refrigeration system.

Images