Heat exchanger tube and heat exchanger using the same

A heat exchanger comprising:

• a plurality of tubes, each of which has a generally flat body having predetermined values in length (an axis X), height (an axis Y), and width (an axis Z) directions, a plurality of refrigerant passages formed passed through the interior of said flat body in the length direction thereof, wherein said refrigerant passages are provided with a plurality of inside passages, each inside passages having a first curved portion that is made by changing predetermined curves over at least a time or more to form a curve changing point protruding into the passage said in the width direction of body, by which turbulence activating parts are formed, and having a second curved portion that is formed opposite to said first curved portion so as to have a singular outwardly convex surface to the passage at one end and a singular outwardly concave surface to the passage at the other end of each passage in the height direction of the tube and is connected slowly to said first curved portion to thereby form a curve closed face, and a pair of outside passages disposed on the outermost both ends of said plurality of inside passages, said plurality of tubes spaced apart equally through which a heat exchanging medium flows;
• a plurality of corrugated fins disposed between said tubes;
• and
• a pair of header tanks spaced apart equally in parallel relation with each other such that the both ends of each of said tubes communicate with each other, through which said heat exchanging medium flows.