Wound heat exchanger, method for producing a wound heat exchanger and method for exchanging heat between a first fluid and a second fluid

A wound heat exchanger (1) comprising:

• a core tube (21) extending along a longitudinal axis (L) in an axial direction (a);
• a tube bundle (2) having a plurality of tubes (20) for conducting a first fluid, wherein the tubes (20) are wound about the core tube (21) in a plurality of windings (23), and
• a plurality of webs (6) extending in the axial direction (a), wherein the webs are provided as spacers between adjacent tube layers (22) in the radial direction such that the webs (6) each form a distance in the radial direction (r) between two respective adjacent tube layers (22),
• wherein the tubes (20) are arranged in a radial direction (r) perpendicular to the axial direction (a) in a plurality of tube layers (22),
• wherein the core tube supports the load of the tube bundle,
• wherein, in at least a section of the tube bundle (2), tube layers (22) adjacent to each other in the radial direction (r) have different radial distances (D) from one another in a cross-sectional plane perpendicular to the longitudinal axis (L), wherein the radial distances (D) of the adjacent tube layers (22) increase monotonically in the radial direction (r), and
• wherein (a) at least two of said plurality of webs (6) have different thicknesses (d) in the radial direction (r), and/or (b) the thickness (d) of at least one of the webs (6) varies along the axial direction (a) such that adjacent windings (23) of at least one of said plurality of tube layers (22) are spaced different distance in the radial direction (r) from the longitudinal axis.