SMALL-DIAMETER HEAT TRANSFER TUBE UNIT OF SMALL-DIAMETER MULTITUBULAR HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To provide a small-diameter heat transfer tube unit capable of remarkably improving heat exchanging performance, having good appearance, and improving the rigidity of a heat transfer fin end face to prevent deformation and to keep an effective airflow rate.;SOLUTION: The width W1 of a heat transfer fin 42c or 42a positioned on the outer peripheral side of one of the heat transfer tubes 41b, 41a longitudinally arranged in two lines is formed larger than the width W2 of the heat transfer fin 42a or 42b positioned on the outer peripheral side of the heat transfer tube 41a or 41b of the other side, thus end faces on the upstream side and the downstream side of external fluids of the heat transfer fins 42a, 42b, 42c, 42c, 42b, 42a, ... can be aligned in a flush state.;COPYRIGHT: (C)2006,JPO&NCIPI