Heat transfer pipe for fin and tube type heat exchanger and fin and tube type heat exchanger using same

摘要

pTo 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)./p