Thermoelectric generators (TEG) convert part of a heat flow into an electric current. They can be used to provide the heat required to vaporise cryogenic (cryogenic) liquids. The now heated and gaseous fuel can, in the case of hydrogen for example, be fed to a consumer such as a fuel cell or a hydrogen engine.
Extending the temperature range to cryogenic temperatures has the potential to increase the efficiency and power density of the TEG.
The challenges for Kryo-TEG lie in the selection of suitable thermoelectric modules and materials, as well as processes for the reliable production of the heat exchanger structures.
In July 2024, tests with liquid nitrogen (LN2) were carried out at the DLR site in Stuttgart. A functional model was successfully operated and measured at cryogenic temperatures for the first time. The promising results serve as the basis for future cryogenic liquid hydrogen tests (LH2).
