| 摘要 |
A method for controlling a flow of refrigerant to an evaporator (1) arranged in a refrigeration system is disclosed. The refrigeration system further comprises an expansion valve (12) and a compressor, the expansion valve (12), the evaporator (1) and the compressor being arranged in a refrigerant flow path having refrigerant flowing therein. The method comprises the steps of increasing an opening degree of the expansion valve (12), thereby increasing a flow of refrigerant to the evaporator (1) sufficiently to substantially eliminate a dry zone (3) of the evaporator (1), decreasing the opening degree of the expansion valve (12) after a period of time has lapsed, and repeating the steps of increasing and decreasing the opening degree of the expansion valve (12). Thus, the opening degree of the expansion valve (12) is‘pulsated’. This causes the superheat value of refrigerant leaving the evaporator (1) to‘toggle’between a zero level and a low, but positive, level. Thereby the average superheat value of the refrigerant leaving the evaporator (1) is decreased, and the refrigeration capacity of the evaporator (1) is utilised more efficiently. Simultaneously, it is ensured that the amount of liquid refrigerant being allowed to pass through the evaporator (1) is kept sufficiently low to prevent damage to the compressor. |
