Helical fractal heat exchanger

A heat exchanger comprising:

• a heat exchanger core defining a helical, first fluid flow path and a helical, second fluid flow path in thermal communication with one another, wherein the first fluid flow path comprises a plurality of first fluid conduits arranged cross-sectionally in a two-dimensional grid configuration comprising at least two rows and at least two columns of first fluid conduits in each pass of the helical first fluid flow path;
• and wherein the second fluid flow path comprises a helical flow area, wherein the second fluid flow path is surrounded by the first fluid conduits;
• a first fluid inlet structure for supplying a first fluid from a first fluid inlet to the plurality of first fluid conduits;
• and
• a first fluid outlet structure for supplying the first fluid from the plurality of first fluid conduits to a first fluid outlet,
• wherein the first fluid inlet and outlet structures each comprise at least two multi-furcation stages, wherein, in each multi-furcation stage, a parent channel divides into two or more sub-channels that diverge away from each other, wherein the sub-channels are arranged in a two-dimensional grid comprising at least two rows and at least two columns, and wherein the two or more sub-channels of a first multi-furcation stage each correspond to a parent channel of a second multi-furcation stage.