Cell structures for use in heat exchangers, and methods of producing the same

A cell structure for use in a heat exchanger, the cell structure comprising:

• a hub, defined as a central chamber having an inner surface and an outer surface;
• and
• a number (n) of tubes, where n is three or more, each tube having a first end, a second end, an inner surface, and an outer surface;
• and
• wherein, the n tubes are configured such that (i) each first end comprises an opening integrally joined at the hub, (ii) each second end extends away from the hub, (iii) the inner surface of each tube and the inner surface of the hub form a smooth, continuous, structure inner surface, (iv) the outer surface of each tube and the outer surface of the hub form a smooth, continuous structure outer surface, and (v) there are no other openings into the hub or the n tubes;
• and an impermeable partition extending across the central chamber of the hub, integrally joined along its perimeter to the central chamber inner surface, dividing the central chamber into a first sub-chamber and a second sub-chamber, the partition preventing fluid communication between the first sub-chamber and the second sub-chamber;
• and wherein a first tube, the first sub-chamber, and a second tube comprise a first flow-path;
• and a third tube, the second sub-chamber, and a fourth tube comprise a second flow-path;
• and wherein the first flow-path and the second flow-path are in fluid isolation from each other.