Abstract: A method and corresponding device for transferring heat between a discharge fluid (3) of a first system (5) and a second system (7). The discharge fluid (3) from the first system (5) is received and conveyed to a given location (9). There is provided at least one non-vertical elongated member (11) being positioned, shaped and sized so as to define an array of stacked cross-sectional profiles (13) extending within at least one wall segment (15), said at least one wall segment (15) being operatively connectable to the second system (7). The discharge fluid (3) is allowed to free-flow (ex. free-fall, cascade, etc.) over said at least one wall segment (15) of stacked cross-sectional profiles (13) so as to allow a heat exchange between the discharge fluid (3) and the array of stacked cross-sectional profiles.