Patent ID: 7165606

Claim:
A heat exchanging tube comprising: a flat tube main body having a predetermined length; and a plurality of refrigerant passages extending in a tube longitudinal direction and arranged in a tube widthwise direction, wherein the following relational equations (a) to (c) are satisfied: W=6 to 18 mm (a), Ac/At× 100=50 to 70% (b) and P/L× 100=350 to 450% (c), where “W” is a width of the tube main body, “Ac” is a total cross-sectional area of the refrigerant passages, “At” is a total cross-sectional area of the tube main body and the refrigerant passages, and “L” is an external perimeter of the tube main body and “P” is a total inner perimeter of the refrigerant passages.