HEAT EXCHANGER

摘要

A heat exchanger of the present invention includes a flow path forming portion 40 which separates a first flow path 11 of one row into a one-directional flowing portion 81 formed around an other-directional pipe portion 22 and an other-directional flowing portion 82 formed around a one-directional pipe portion 21, a flow path cross-sectional area of the one-directional flowing portion 81 is made smaller toward a downstream side, a flow path cross-sectional area of the other-directional flowing portion 82 is made greater toward the downstream side and hence, it is possible to enhance a heat transfer facilitating effect and to reduce a pressure loss.