Bent finned tube heat exchanger.

摘要

A bent finned tube heat exchanger comprises plate fins with a zigzag shape defining a plurality of sharp parts 7 pointing alternately in opposite directions. A plurality of weakened portions 10 are provided between adjacent sharp parts and holes in the sharp parts are aligned in two rows in the longitudinal direction of the fin. The heat exchanger is constructed as a planar exchanger by passing tubes 8a, 8b through holes 4a, 4b and expanding the tubes into contact with collars 5 of the fins. The planar exchanger is then bent. During bending the fins are torn along their weakened portions (see figure 4) and the displacement of the tubes and corresponding torn fin portions during bending is such that the tubes 8a and 8b are of equal length following bending.