DEVICE FOR GUIDING AT LEAST TWO FLUID STREAMS, ELECTROCHEMICAL SYSTEM, AND METHOD FOR PRODUCING A DEVICE WITH A HEAT TRANSFER ELEMENT

A device for guiding at least two fluid streams includes: a heat transfer element, which includes a gyroidal structure, which includes a main gyroid and a secondary gyroid intersecting to form an interleaved gyroid thereby forming at least a first channel system and a second channel system and an interstitial space system, the first channel system and the second channel system each including a first passage width, the interstitial space system including a second passage width, the first channel system and the second channel system being spatially separated from the interstitial space system, the interstitial space system including a support structure that penetrates other portions of the interstitial space system.