Heat exchanger and replacement method of heat exchange core

A heat exchanger comprising:

• a heat exchange core;
• a shell provided to surround the heat exchange core;
• a first partition wall that is provided in a space surrounded by an outer surface of the heat exchange core and an inner surface of the shell, and partitions the space into a first header space communicating with the heat exchange core and a second header space communicating with the heat exchange core;
• and
• a second partition wall that is provided in the space surrounded by an outer surface of the heat exchange core and an inner surface of the shell, and partitions the space into a third header space communicating with the heat exchange core and the first header space or the second header space, wherein:
• the first header space or the second header space and the third header space are adjacent to each other, separated by the second partition wall;
• and
• the second partition wall is attached to the inner surface of the shell via an extendable member configured to extend along the axial direction of the shell.

A heat exchanger comprising:

• a heat exchange core;
• a shell provided to surround the heat exchange core;
• and
• a first partition wall that is provided in a space surrounded by an outer surface of the heat exchange core and an inner surface of the shell, and partitions the space into a first header space communicating with the heat exchange core and a second header space communicating with the heat exchange core, wherein:
• the first header space and the second header space are adjacent to each other, separated by the first partition wall;
• the shell has a cylindrical shape;
• the heat exchange core has a columnar shape;
• the heat exchange core is disposed in the shell such that an axis of the columnar shape becomes substantially parallel to an axis of the cylindrical shape;
• and
• the first partition wall separates the first header space and the second header space into one side and another side along an axis of the cylindrical shape.