Patent ID: 6026893
Filing Date: 2000-02-22
Classification: F28D,F28F

Abstract:
A fin-type heat exchanger, comprising:a plurality of plate-shaped fins disposed in spaced parallel relationship to define air channels there between for conducting an air flow from an air inlet side to an air exhaust side of each fin;first and second rows of pipe holes formed in each fin adjacent the air intake and air exhaust sides, respectively;a bent pipe extending through the pipe holes for conducting a heat exchange fluid;groups of slits formed in each fin between adjacent pipe holes in each of the first and second rows of pipe holes, whereby there are formed a first row of slit groups adjacent the air intake side, and a second row of slit groups adjacent the air exhaust side, there being fewer slits in the first row of slit groups than in the second row of slit groups;the slits having a width dimension in the direction of air flow, and a length dimension perpendicular to the direction of air flow, the width of the slits disposed in the first row of slit groups being greater than the width of the slits disposed in the second row of slit groups;wherein each group of slits in the second row of slit groups includes slits spaced apart in the direction of air flow, whereby one of the spaced-apart slits is disposed closer to a downstream edge of the exhaust side than is another of the slits and has a longer length than said another of the spaced-apart slits.