| 摘要 |
PROBLEM TO BE SOLVED: To minimize a drop in the performance of an evaporator attributed to a positioning means by accurately positioning of inner fins for the promotion of heat transfer in a refrigerant path in a tube. SOLUTION: In a metal sheet 4 comprising a tube 2, protrusions 70 respectively projecting to the sides of inner fins 53 and 54 are formed at a part somewhere in the direction of a refrigerant flows in the tube and in the course across the width of refrigerant paths 2a and 2b in the tube. The length W of the protrusions 70 across the width of the refrigerant paths 2a and 2b in the tube is made larger than the length L of one wavelength of a wave in shape of the inner fins 53 and 54, and the top parts of the protrusions 70 are press fitted on bent top parts of the inner fins 53 and 54. |
