Condensing Heat Exchangers as Main Components in LSS for Manned Spaceflight 901284
Condensing heat exchangers are used for the thermal and humidity control within spaceflight LSS. Heat loads are transferred to a coolant loop, and humidity is removed by condensation and separation from the air flow.
For minimum mass and volume at a maximum of effectiveness, adaptable plate-fin configurations are superior. Efficient separation of the condensate under zero-g conditions is achieved by enhancement of wettability of condenser surfaces with a hydrophilic coating, and the drain-off through a so-called slurper section.
Exemplary, the Hermes ECLSS condensing heat exchanger and the EVA sublimator unit are presented. The advanced design comprises a new type of hydrophilic coating and several constructional details, resulting in a significant mass reduction.