| 摘要 |
PROBLEM TO BE SOLVED: To provide a plate fin type heat exchanger of a light and compact structure which has an excellent heat exchanging efficiency even when employed in a fuel cell, an evaporator used for chemical processes such as of a hydrogen producing device or the like, or employed in a fuel cell of a motor vehicle or the like which is supposed to be accompanied by vibration and tilting during traveling. SOLUTION: In a structure of a crossflow plate fin type heat exchanger, there is located an upper header tank of fluid channel structure wherein a tube plate is arranged so as to block the entrance of a low temperature fluid channel. The distribution rate of the low temperature fluid from the upper header tank to the individual low temperature fluid channels is rendered larger as positioned closer to the entrance side of the high temperature fluid channel. The low temperature fluid is introduced from the upper header tank subjected to heat exchange and brought out of the lower header tank, and thereafter the low temperature fluid is again subjected to heat exchange with the high temperature fluid at the exit side of the high temperature fluid channel. In this way, the heat exchanger is rendered to have a structure wherein a U-turn of fluid is possible, and thus the heat exchange efficiency can be improved. |
