Heat transfer tube for fin-and-tube heat exchanger and fin-and-tube heat exchanger using the same

摘要

To provide a heat transfer pipe for a fin and tube-type heat exchanger with which the heat transfer rate on the coolant side can be effectively improved, and a fin and tube-type heat exchanger using the same. Triangular holes (20) are formed in flat multiple hole pipes (14) made of aluminium or an alloy thereof so as to give a ratio (D/h) in the region of 0.40 to 0.80 where (D) is the hydraulic diameter defined by dividing four times the cross-sectional area of the hole by the sum of the length of the sides of the hole and (h) is the height of the hole; and said flat multiple hole pipes (14) and fins (12) made of aluminium or an alloy thereof are assembled to form a fin and tube-type heat exchanger (10).