Passive organic working fluid ejector refrigeration method

摘要

The present invention relates to a passive type organic working fluid ejector refrigeration method. The liquid organic working fluid of the reservoir is added to evaporator using gravity. Then the refrigerant absorbs heat during evaporation in the evaporator. When the refrigerant temperature and pressure increases to a certain value, the self-operated pressure regulator valve automatically opens and the ejector begins to work. After condensing in the condenser, the working fluid divided into two streams. One stream returns to the reservoir and the other one flows into the cooling evaporator of refrigeration cycle to produce chilled water about 12° C. When the liquid refrigerant is completely evaporated in the evaporator, the self-operated pressure regulator valve opens and the working fluid flows into the evaporator from the reservoir. A certain quality of the working fluid is closed in the evaporator, preparing for a new work cycle as above-mentioned. The system of the present invention can use organic fluid as the working fluid to utilize the low-temperature heat sources range from 60 to 200° C., using groundwater, river (sea) water or air as cold source and using gravity to transport liquid working fluid.

主权项

1. A method of the passive type organic working fluid ejector refrigeration comprises the following steps of:
(1) Through judging the low pressure in the evaporator, the first self-operated pressure regulator valve and the second self-operated pressure regulator valve are closed. The third self-operated pressure regulator valve is opened, the liquid organic working fluid of reservoir flows into the evaporator under the action of gravity until surface equilibrium. Then the third self-operated pressure regulator valve is closed, the liquid refrigerant will be closed in the evaporator; (2) The liquid refrigerant absorbs heat and evaporates in the evaporator. The temperature and pressure of working fluid is increasing, until reaching 101° C. and 2 MPa. The first self-operated pressure regulator valve is opened, and the ejector begins to work; (3) The refrigerant vapor is ejected into the condenser through the ejector and condenses to liquid. Then the working fluid is divided into two streams. One stream returns to the reservoir, and the other stream flows into the cooling evaporator of refrigeration cycle, by ejecting effect, resulting in cooling water of 12° C.; (4) During operation process, the liquid refrigerant continues to absorb heat and evaporate in the evaporator constantly until completely evaporated, and the pressure drops to the set pressure of the first self-operated pressure regulator valve. Then the self-operated pressure regulator valves work, and the working fluid flows into the evaporator from the reservoir; (5) After the refrigerant liquid injection process, the third self-operated pressure regulator valve and the second self-operated pressure regulator valve are closed. The liquid refrigerant is closed again in the evaporator preparing for a new cycle repeated the above steps.