Heat exchange structure comprising insertable alternating fin structure

A heat exchange structure comprising:

• a partition;
• two flow channels stacked each defined by walls surrounding a space through which fluid flows, the walls of each of the two flow channels including the partition as a part thereof, in a stacking direction through the partition and thermally coupled to each other through the partition, each of the two flow channels having an opening on any one of opposite sides in an extending direction thereof for fluid to flow into or out of;
• and
• a fin structure detachably installed from one of the openings in at least one flow channel of the two flow channels along the extending direction, wherein
• the fin structure includes fins arranged with intervals in a longitudinal direction of the at least one flow channel in which the fin structure is installed, the fins configured to form openings alternately arranged along the at least one flow channel on one side and the other side of the at least one flow channel in the stacking direction, and
• in the stacking direction, each opening has a height defined by a difference between a height of the at least one flow channel and a smallest height of a corresponding one of the fins.