Heat exchanger with sets of channels forming checkered pattern

Heat exchanger comprising

• a central body with
• a first set of channels forming part of a first set of fluid pathways through the heat exchanger, and
• a second set of channels forming part of a second set of fluid pathways through the heat exchanger,
• the channels of the first and second sets extending from a first end of the central body, along a main direction through the central body, to a second end of the central body,
• wherein, in the central body, in a cross-section across the main direction, the channels of the first and second sets form a checkered pattern by being arranged alternatingly in a plurality of rows along a first direction extending along a first portion of a perimeter of the pattern and alternatingly in a plurality of rows along a second direction extending transverse to the first direction and along a second portion of the perimeter of the pattern,
• the heat exchanger further comprising two inner transition portions of which one extends from the first end of the central body and one extends from the second end of the central body,
• the channels of the first and second sets extending from the ends of the central body, in the checkered pattern and into each of the inner transition portions at an inner end of respective inner transition portion, through the respective inner transition portion and to an outer end of the respective inner transition portion,
• wherein, in the respective inner transition portion, every second row along the first direction is increasingly shifted in the first direction and relative every other second row of the rows, until the checkered pattern of the first and the second sets of channels at the inner end of the respective inner transition portion is transformed into a line pattern at the outer end of the respective inner transition portion, the channels of the respective set of channels thereby, at each outer end of the respective inner transition portion, being arranged alongside each other in rows that extend along the second direction, with the rows of the first set of channels and the rows of the second set of channels being arranged alternatingly along the first direction.