Natural cooling system for calculating capacity of refrigerant pump based on temperature difference and control method of natural cooling system

Abstract

The invention discloses a natural cooling system for calculating the capacity of a refrigerant pump based on the temperature difference and a control method of the natural cooling system, and relatesto the technical field of refrigeration. The natural cooling system structurally comprises a compressor refrigerating device, a refrigerant pump cooling device, an outdoor ambient temperature sensor,an indoor ambient temperature sensor, an outdoor fan, an indoor fan and a controller. The compressor refrigerating device comprises a compressor, a compressor system evaporator and a compressor systemcondenser which are sequentially connected. The refrigerant pump cooling device comprises the refrigerant pump, a refrigerant pump system evaporator and a refrigerant pump system condenser which aresequentially connected. The compressor, the refrigerant pump, the outdoor ambient temperature sensor, the indoor temperature sensor, the outdoor fan and the indoor fan are electrically connected withthe controller and controlled by the controller, the time of input of the refrigerant pump can be judged more accurately, indoor temperature control is more stable, and running of the system is saferand more reliable.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a natural cooling system and a control method for calculating refrigerant pump capacity based on temperature difference. Background technique [0002] At present, the start and stop and operation mode of the refrigerant pump are generally controlled according to the outdoor ambient temperature or the temperature difference between indoor and outdoor environments. For example, when the outdoor ambient temperature reaches above 10°C or the indoor and outdoor ambient temperature difference reaches below 15°C, the compressor keeps working. , the refrigerant pump stops (compressor-only operation mode); when the outdoor ambient temperature reaches below 5°C or the indoor-outdoor ambient temperature difference reaches above 20°C, the refrigerant pump is started, and the compressor is also put into operation at the same time (compressor-pump mixed operation mode); When the outdoor ...

AI Technical Summary

Problems solved by technology

[0003] With the existing technical scheme, the judgment conditions for the input and withdrawal of the refrigerant pump are simple and rough, and the natural cooling capacity of the refrigerant pump cannot be accurately judged. Therefore, it is difficult to judge the timing of the refrigerant pump input accurately and reasonably. When the cooling capacity of the pump is too low, it will be put into pure refrigerant pump operation, which will cause unstable indoor temperature control and frequent start and stop of the compressor; The frequent start and stop of the pump also has an unsafe impact on the compressor refrigeration system, and also causes the compressor to easily return liquid and the evaporator to easily frost

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