Ejector cycle device

An ejector cycle device comprising:

• a compressor for drawing and compressing refrigerant;
• a refrigerant radiator for radiating heat of high-pressure refrigerant discharged from the compressor;
• an ejector having a nozzle part for decompressing refrigerant from the refrigerant radiator, and a refrigerant suction port for drawing refrigerant by a high-velocity flow of refrigerant jetted from the nozzle part;
• a branch passage for introducing refrigerant branched from a branch portion located on an upstream side of the nozzle part of the ejector in a refrigerant flow direction into the refrigerant suction port;
• a first evaporator arranged on a downstream side of the ejector in the refrigerant flow direction and for evaporating the refrigerant;
• and
• a second evaporator arranged in the branch passage and for evaporating the refrigerant, wherein:
• the first evaporator includes a heat exchange core part having a refrigerant passage volume as a first core part volume;
• the second evaporator includes a heat exchange core part having a refrigerant passage volume as a second core part volume;
• and
• when a total of the first core part volume of the heat exchange core part of the first evaporator and the second core part volume of the heat exchange core part of the second evaporator is assumed to be a total volume, a volume ratio (β) of the second core part volume to the total volume is set within a range from 0.09 or more to 0.89 or less;
• wherein
• the only refrigerant flowing to the refrigerant suction port of the ejector is refrigerant branched at the branch portion and flowing through the branch passage.

An ejector cycle device comprising:

• a compressor for drawing and compressing refrigerant;
• a refrigerant radiator for radiating heat of high-pressure refrigerant discharged from the compressor;
• an ejector having a nozzle part for decompressing refrigerant from the refrigerant radiator, and a refrigerant suction port for drawing refrigerant by a high-velocity flow of refrigerant jetted from the nozzle part;
• a branch passage for introducing refrigerant branched from a branch portion located on an upstream side of the nozzle part of the ejector in a refrigerant flow into the refrigerant suction port;
• a first evaporator arranged on a downstream side of the ejector in the refrigerant flow and for evaporating the refrigerant;
• and
• a second evaporator arranged in the branch passage and for evaporating the refrigerant, wherein:
• the first evaporator includes a heat exchange core part having a refrigerant passage volume as a first core part volume;
• the second evaporator includes a heat exchange core part having a refrigerant passage volume as a second core part volume;
• when a ratio of a flow rate of refrigerant flowing in the second evaporator to a flow rate of refrigerant discharged from the compressor is set as a refrigerant flow rate ratio (α), and when a total of the first core part volume of the heat exchange core part of the first evaporator and the second core part volume of the heat exchange core part of the second evaporator is assumed to be a total volume, and when a ratio of the second core part volume to the total volume is set as a volume ratio (β), a ratio difference (α−β) between the refrigerant flow rate ratio (α) and the volume ratio (β) is set within a range from −0.3 or more to 0.3 or less;
• and
• the only refrigerant flowing to the refrigerant suction port of the ejector is refrigerant branched at the branch portion and flowing through the branch passage.

An ejector cycle device comprising:

• a compressor for drawing and compressing refrigerant;
• a refrigerant radiator for radiating heat of high-pressure refrigerant discharged from the compressor;
• an ejector having a nozzle part for decompressing refrigerant from the refrigerant radiator, and a refrigerant suction port for drawing refrigerant by a high-velocity flow of refrigerant jetted from the nozzle part;
• a branch passage for introducing refrigerant branched from a branch portion located on an upstream side of the nozzle part of the ejector in a refrigerant flow direction into the refrigerant suction port;
• a first evaporator arranged on a downstream side of the ejector in the refrigerant flow direction and for evaporating the refrigerant;
• and
• a second evaporator arranged in the branch passage and for evaporating the refrigerant, wherein:
• the first evaporator includes a heat exchange core part having a refrigerant passage area;
• the second evaporator includes a heat exchange core part having a refrigerant passage area;
• the refrigerant passage area in the heat exchange core part of the first evaporator is larger than the refrigerant passage area in the heat exchange core part of the second evaporator;
• and
• the only refrigerant flowing to the refrigerant suction port of the ejector is refrigerant branched at the branch portion and flowing through the branch passage.

An ejector cycle device comprising:

• a compressor for drawing and compressing refrigerant;
• a refrigerant radiator for radiating heat of high-pressure refrigerant discharged from the compressor;
• an ejector having a nozzle part for decompressing refrigerant from the refrigerant radiator, and a refrigerant suction port for drawing refrigerant by a high-velocity flow of refrigerant jetted from the nozzle part;
• a branch passage for introducing refrigerant branched from a branch portion on an upstream side of the nozzle part of the ejector in a refrigerant flow direction into the refrigerant suction port;
• a first evaporator arranged on a downstream side of the ejector in the refrigerant flow direction and for evaporating the refrigerant;
• and
• a second evaporator arranged in the branch passage and for evaporating the refrigerant, wherein:
• the first evaporator has an air-side heat transfer area and a refrigerant-side heat transfer area;
• the second evaporator has an air-side heat transfer area and a refrigerant-side heat transfer area;
• a heat transfer area ratio (γ2) of the air-side heat transfer area to the refrigerant-side heat transfer area in the second evaporator, is larger than a heat transfer area ratio (γ1) of the air-side heat transfer area to the refrigerant-side heat transfer area in the first evaporator;
• and
• the only refrigerant flowing to the refrigerant suction port of the ejector is refrigerant branched at the branch portion and flowing through the branch passage.