Spiral tube heat exchanger

A heat exchanger comprising:

• a plurality of first fluid pathways enclosed in a cylindrical heat exchanger body to convey a first fluid through the heat exchanger body;
• a plurality of second fluid pathways enclosed in the heat exchanger body to convey a second fluid through the heat exchanger body and facilitate thermal energy exchange between the first fluid and the second fluid;
• a first fluid inlet operably connected to the plurality of first fluid pathways and oriented perpendicular to a central axis of the heat exchanger;
• a second fluid inlet operably connected to the plurality of second fluid pathways and oriented perpendicular to the central axis;
• a first header disposed at a first end of the heat exchanger body, the first header including:
• a plurality of first header pathways extending radially outwardly from the body portion to connect a first port to the plurality of first fluid pathways;
• and
• a plurality of second header pathways extending radially outwardly from the body portion to connect a second port to the plurality of second fluid pathways;
• wherein the first fluid inlet and the second fluid inlet are disposed at a same axial end of the heat exchanger, and on opposite lateral sides of the heat exchanger;
• wherein the plurality of first fluid pathways and the plurality of second fluid pathways are together arranged in a spiral arrangement extending along the central axis of the heat exchanger defined by spiral portions of the plurality of first fluid pathways and the plurality of second fluid pathways;
• wherein the heat exchanger body is a unitary element with openings defining the plurality of first fluid pathways and the plurality of second fluid pathways extending therethrough, surrounded by and separated by a thickness of body material, the body material defining an inner wall of each of the plurality of first fluid pathways and the plurality of second fluid pathways and
• wherein a helix angle of one or more of the plurality of first fluid pathways and the plurality of second fluid pathways in the cylindrical body portion varies along the central axis;
• wherein the plurality of first fluid pathways and the plurality of second fluid pathways are arranged in a repeating arrangement of rows of the plurality of first fluid pathways alternating with rows of the plurality of second fluid pathways across the heat exchanger relative to the central axis.