Heat exchanger

Heat exchanger for cooling or heating pseudoplastic fluids with cooling or heating elements built in a straight flow-through area of the flowable substance to be cooled or heated, characterized in that the cooling or heating elements (1), for conducting the cooling or heating medium in their interior are flat tubes, and are arranged side-by-side and, spaced from each other in rows in parallel planes which run obliquely to the direction of flow of the heat exchanger and are spaced from each other in the direction of flow of heat exchanger, adjacent rows of the flat tubes of the cooling or heating elements (1) arranged in two successive planes intersect each other when viewed in the direction of flow of the heat exchanger, and that the frontal distance (c) abetween two successive rows (2, 3) of cooling or heating elements is at the most as great as the smallest center-to-center distance (m) between two adjacent cooling or heating elements (1) of those rows, whereby the flat tubes of the cooling or heating elements (1) when viewed in cross section, have a height of 5 to 12 mm and width of 50 to 80 mm and run at substantially parallel with their width and substantially perpendicular with their height to the direction of flow of the flowable substance to be cooled or heated;

• and the distance (a) between two laterally adjacent flat tubes (1) is in the range of 7 to 10 mm, whereby heating or cooling of the pseudoplastic fluids can be accomplished without pulsation of the flow and incrustation or clogging of the heating or cooling elements.