PURPOSE: To reduce the flow resistance of cooling water and improve the heat dissipating effect of a heat exchanger by a method wherein a bypass path is formed between neighboring two chambers of a tank whose inside is partitioned by partitioning plates in the N circuit type heat exchanger employing ellipse tubes in order to reduce the flow amount of the cooling water which flows from the tank into the water tubes of a core.
CONSTITUTION: The upper tank 10 of an N circuit type heat exchanger employing ellipse tubes is partitioned into an inlet chamber 12 and a return chamber 13 by a partitioning plate 11 while the partitioning plate 11 is provided with a bypass path 15 to communicate the inlet chamber 12 with the return chamber 13. On the other hand, a lower tank 20 is partitioned into a return chamber 22 and an outlet chamber 23 by a partitioning plate 21 while the partitioning plate 21 is provided with the bypass path 25 to communicate the return chamber 22 with the outlet chamber 23. Thus, a part of the cooling water is bypassed at the inside of the upper tank 10 and the lower tank 20, whereby the average flow speed of the cooling water flowing through water tubes 31 is reduced and the flow resistance of the cooling water may be reduced.
SARUTA MASAHIRO
HAYAKAWA HISASHI
