A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant includes tubes through which the refrigerant flows. The tubes are stacked and arranged in a horizontal direction, and extend in a direction perpendicular to t
A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant includes tubes through which the refrigerant flows. The tubes are stacked and arranged in a horizontal direction, and extend in a direction perpendicular to the horizontal direction or with an angle from the horizontal direction. The tubes include a first heat exchange area where refrigerant having a temperature equal to or higher than a standard temperature exchanges heat with first air blown to a space, and a second heat exchange area where refrigerant having a temperature lower than the standard temperature exchanges heat with second air blown to the space. Generally, the second air has a temperature different from a temperature of the first air.
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1. A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant, and the refrigerant radiator being configured to radiate heat to air until gas-phase refrigerant discharged from the compressor changes at least to gas-li
1. A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant, and the refrigerant radiator being configured to radiate heat to air until gas-phase refrigerant discharged from the compressor changes at least to gas-liquid two-phase refrigerant, the refrigerant radiator comprising a plurality of tubes through which the refrigerant flows, the tubes being stacked and arranged in a horizontal direction, and extending in a direction perpendicular to the horizontal direction or with an angle from the horizontal direction, whereinthe tubes include a first heat exchange area where refrigerant having a temperature equal to or higher than a standard temperature exchanges heat with first air to be blown to a space, and a second heat exchange area where refrigerant having a temperature lower than the standard temperature exchanges heat with second air to be blown to the space, the second air generally having a temperature different from a temperature of the first air;a heat exchanging portion including the tubes is configured to radiate heat until gas-phase refrigerant discharged from the compressor changes to liquid-phase refrigerant, andthe tubes are inclined with an inclination angle θ between a flow direction of refrigerant flowing in the tubes and the horizontal direction, and are configured to satisfy the following formula, when the inclination angle θ is in a range from 0 to 90 degrees, Re≧A×X6+B×X5+C×X4+D×X3+E×X2+F×X+G whereA=−0.0537×θ2+9.7222×θ+407.19B=−(−0.2093×θ2+37.88×θ+1586.3)C=−0.3348×θ2+60.592×θ+2538.1D=−(−0.2848×θ2+51.53×θ+2158.2)E=−0.1402×θ2+25.365×θ+1062.8F=−(−0.0418×θ2+7.5557×θ+316.46)G=−0.0132×θ2+2.3807×θ+99.73in which X is a dryness degree of refrigerant at a predetermined position of the tubes where gas-liquid two-phase refrigerant flows, and Re is a Reynolds number at the predetermined position, which is calculated based on an average flow velocity (m/s) of refrigerant flowing in the tubes. 2. A refrigerant radiator used for a vapor compression refrigerant cycle including a compressor configured to compress and discharge refrigerant, and the refrigerant radiator being configured to radiate heat to air until gas-phase refrigerant discharged from the compressor changes at least to gas-liquid two-phase refrigerant, the refrigerant radiator comprising a plurality of tubes through which the refrigerant flows, the tubes being stacked and arranged in a horizontal direction, and extending in a direction perpendicular to the horizontal direction or with an angle from the horizontal direction, whereinthe tubes include a first heat exchange area where refrigerant exchanges heat with first air to be blown to a space, and a second heat exchange area where refrigerant exchanges heat with second air to be blown to the space, the second air having a temperature different from a temperature of the first air,the first heat exchange area includes a refrigerant-inlet side of the tubes,the second heat exchange area includes a refrigerant-outlet side of the tubes;a heat exchanging portion including the tubes is configured to radiate heat until gas-phase refrigerant discharged from the compressor changes to liquid-phase refrigerant, andthe tubes are inclined with an inclination angle θ between a flow direction of refrigerant flowing in the tubes and the horizontal direction, and are configured to satisfy the following formula, when the inclination angle θ is in a range from 0 to 90 degrees, Re≧A×X6+B×X5+C×X4+D×X3+E×X2+F×X+G whereA=−0.0537×θ2+9.7222×θ+407.19B=−(−0.2093×θ2+37.88×θ+1586.3)C=−0.3348×θ2+60.592×θ+2538.1D=−(−0.2848×θ2+51.53×θ+2158.2)E=−0.1402×θ2+25.365×θ+1062.8F=−(−0.0418×θ2+7.5557×θ+316.46)G=−0.0132×θ2+2.3807×θ+99.73in which X is a dryness degree of refrigerant at a predetermined position of the tubes where gas-liquid two-phase refrigerant flows, and Re is a Reynolds number at the predetermined position, which is calculated based on an average flow velocity (m/s) of refrigerant flowing in the tubes. 3. The refrigerant radiator according to claim 1, wherein the temperature of the first air is higher than the temperature of the second air. 4. The refrigerant radiator according to claim 1, wherein the tubes include a tube portion in which refrigerant flows downwardly. 5. The refrigerant radiator according to claim 1, further comprising a header tank extending a stacking direction of the tubes and arranged at least at one side of the tubes in a longitudinal direction of the tubes, to collect and distribute refrigerant. 6. The refrigerant radiator according to claim 5, wherein an inner space of the header tank is separated into a plurality of spaces,one of the separated spaces on one side of the header tank includes a refrigerant inlet which introduces refrigerant, andanother one of the separated spaces on the other side of the header tank includes a refrigerant outlet which discharges refrigerant. 7. The refrigerant radiator according to claim 1, wherein the tubes are arranged in multiple layers in an air flow direction. 8. The refrigerant radiator according to claim 1, wherein the tubes includes a first tube group where refrigerant flows from a bottom side upwardly, and a second tube group where refrigerant flows from a top side downwardly. 9. The refrigerant radiator according to claim 1, wherein the tubes are arranged such that refrigerant flows in all the tubes in the same direction. 10. The refrigerant radiator according to claim 1, wherein the space is an inner space of a vehicle compartment, the first air is air inside of the vehicle compartment, and the second air is air outside of the vehicle compartment, in a case where the refrigerant cycle is used for a vehicle air conditioner. 11. The refrigerant radiator according to claim 2, wherein the temperature of the first air is higher than the temperature of the second air. 12. The refrigerant radiator according to claim 2, wherein the temperature of the first air is lower than the temperature of the second air. 13. The refrigerant radiator according to claim 2, wherein the tubes include a tube portion in which refrigerant flows downwardly. 14. The refrigerant radiator according to claim 2, further comprising a header tank extending a stacking direction of the tubes and arranged at least at one side of the tubes in a longitudinal direction of the tubes, to collect and distribute refrigerant. 15. The refrigerant radiator according to claim 14, wherein an inner space of the header tank is separated into a plurality of spaces,one of the separated spaces on one side of the header tank includes a refrigerant inlet which introduces refrigerant, andanother one of the separated spaces on the other side of the header tank includes a refrigerant outlet which discharges refrigerant. 16. The refrigerant radiator according to claim 2, wherein the tubes are arranged in multiple layers in an air flow direction. 17. The refrigerant radiator according to claim 2, wherein the tubes includes a first tube group where refrigerant flows from a bottom side upwardly, and a second tube group where refrigerant flows from a top side downwardly. 18. The refrigerant radiator according to claim 2, wherein the tubes are arranged such that refrigerant flows in all the tubes in the same direction. 19. The refrigerant radiator according to claim 1, wherein the flow direction of the refrigerant is parallel to the horizontal direction or an upward direction. 20. A vehicle air conditioner comprising the refrigerant radiator according to claim 1, wherein the vehicle air conditioner blows the first air and the second air toward a driver seat and a front-passenger seat in a vehicle compartment, andthe tubes are stacked and arranged in a right-left direction of an instrument panel. 21. The refrigerant radiator according to claim 2, wherein the flow direction of the refrigerant is parallel to the horizontal direction or an upward direction. 22. A vehicle air conditioner comprising the refrigerant radiator according to claim 2, wherein the vehicle air conditioner blows the first air and the second air toward a driver seat and a front-passenger seat in a vehicle compartment, andthe tubes are stacked and arranged in a right-left direction of an instrument panel.
Matsuda, Masanori; Kakizaki, Shinji; Someya, Takeshi, High-voltage equipment cooling system for electric vehicle and high-voltage equipment cooling method for electric vehicle.
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