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A heat exchange tube having a flat shape includes a plurality of fluid paths having a circular cross section and extending in a longitudinal direction of the tube. Each fluid path is parallel to each other fluid path. The tube is dimensioned such that a distance between two adjacent fluid paths is d

A heat exchange tube having a flat shape includes a plurality of fluid paths having a circular cross section and extending in a longitudinal direction of the tube. Each fluid path is parallel to each other fluid path. The tube is dimensioned such that a distance between two adjacent fluid paths is defined as Wt, and a circumferential thickness between a surface of the tube and an outermost fluid path is defined as Ht. The distance Wt and the circumferential thickness Ht have a relationship as 0.42≦Ht/Wt≦0.98.

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What is claimed is: 1. A single heat exchange tube having a flat shape comprising: a plurality of fluid paths having a circular cross section extending in a longitudinal direction of the tube, the plurality of fluid paths being parallel with each other; wherein the tube has a distance between two a

What is claimed is: 1. A single heat exchange tube having a flat shape comprising: a plurality of fluid paths having a circular cross section extending in a longitudinal direction of the tube, the plurality of fluid paths being parallel with each other; wherein the tube has a distance between two adjacent fluid paths in the heat exchange tube defined as Wt, and a circumferential thickness between an outer surface of the heat exchange tube and an inner surface of an outermost fluid path is defined as Ht, wherein the distance Wt and the circumferential thickness Ht have a relationship as: 0.63≦Ht/Wt≦0.77; wherein the tube is used for a high-pressure side heat exchanger in a vapor-compression refrigerant cycle with CO2 refrigerant, wherein each of the fluid paths has a diameter defined as Dp, wherein the tube is made of material having a tensile strength defined as S, and wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (0.73−0.0036×S)×Dp≦Wt≦(1.69−0.0084×S)×Dp. 2. The tube according to claim 1, wherein the fluid paths are aligned in a line along with a latitudinal direction of the tube. 3. The tube according to claim 2, wherein the tube includes a circumferential surface having a concavity and a convexity corresponding to the fluid path. 4. The tube according to claim 1, wherein the fluid paths are aligned in multiple lines along with a latitudinal direction of the tube, and wherein two adjacent fluid paths disposed in two adjacent lines, respectively, are disposed alternately. 5. The tube according to claim 4, wherein the tube includes a circumferential surface having a concavity and a convexity corresponding to the fluid path. 6. The tube according to claim 1, wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (0.97−0.0048×S)×Dp≦Wt≦(1.45−0.0072×S)×Dp. 7. The tube according to claim 1, wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (1.09−0.0054×S)×Dp≦Wt≦(1.33−0.0066×S)×Dp. 8. The tube according to claim 1, wherein the tensile strength S is in a range between 50N/mm2 and 130N/mm2, and wherein the tube is made of aluminum based material. 9. The tube according to claim 1, wherein the diameter Dp is in a range between 0.4 mm and 2.0 mm. 10. A single heat exchange tube having a flat shape comprising: a plurality of fluid paths having a circular cross section extending in a longitudinal direction of the tube, the plurality of fluid paths being parallel with each other; wherein the tube has a distance between two adjacent fluid paths in the heat exchange tube defined as Wt, and a circumferential thickness between an outer surface of the heat exchange tube and an inner surface of an outermost fluid path is defined as Ht, wherein the distance Wt and the circumferential thickness Ht have a relationship as: 0.63≦Ht/Wt≦0.77; wherein the tube is used for a low-pressure side heat exchanger in a vapor-compression refrigerant cycle with CO2 refrigerant, wherein each of the fluid paths has a diameter defined as Dp, wherein the tube is made of material having a tensile strength defined as S, and wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (0.34−0.0024×S)×Dp+0.06≦Wt≦(0.80−0.0056×S)×Dp+0.14. 11. The tube according to claim 10, wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (0.46−0.0032×S)×Dp+0.08≦Wt≦(0.68−0.0048×S)×Dp+0.12. 12. The tube according to claim 10, wherein the relationship among the distance Wt, the tensile strength S and the diameter Dp is defined as: (0.51−0.0036×S)×Dp+0.09≦Wt≦(0.63−0.0044×S)×Dp+0.11. 13. The tube according to claim 10, wherein the tensile strength S is in a range between 50N/mm2 and 130N/mm2, and wherein the tube is made of aluminum based material. 14. The tube according to claim 10, wherein the diameter Dp is in a range between 0.4 mm and 2.0 mm.