Ejector cycle system with critical refrigerant pressure
AssigneeDenso Corporation
InventorsHirotsugu Takeuchi, Hiroshi Ishikawa, Kunio Iritani
Life of this patent
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Abstract
In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.
Claims11
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator which cools refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector which decompresses and expands refrigerant from the radiator to suck gas refrigerant evaporated in the evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into the compressor;
- a gas-liquid separator for storing refrigerant therein, in which refrigerant from the ejector is separated into gas refrigerant and liquid refrigerant;
- a pipe member disposed in the gas-liquid separator, through which gas refrigerant in the gas-liquid separator is introduced into the compressor, the pipe member having a hole opened in the liquid refrigerant within the gas-liquid separator, from which oil in the gas-liquid separator is introduced into the compressor;
- and
- a liquid refrigerant introduction pipe through which liquid refrigerant in the gas-liquid separator is introduced into the evaporator, wherein:
- the liquid refrigerant introduction pipe has a throttle means for decompressing refrigerant at an outlet side;
- the ejector includes a nozzle in which a pressure energy of refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, and a pressure increasing portion in which the pressure of refrigerant to be discharged is increased while refrigerant jetted from the nozzle and gas refrigerant sucked from the evaporator are mixed;
- the pressure increasing portion is inserted into the gas-liquid separator such that refrigerant flows through the pressure increasing portion from below upwardly;
- and
- the pressure increasing portion has refrigerant outlet from which refrigerant in the ejector is discharged into the gas-liquid separator.
Dependencies are inferred from the claim text.