raw · papers · ingested 2026-06-19
Cycle stability of sorption materials and composites for heat pumps and cooling machines
Source: https://publica.fraunhofer.de/entities/publication/02719d48-080b-46d6-b6be-e58662354ec0
Fraunhofer ISE institutional study; custom hydrothermal cycling rig.
Key findings
- Cu-BTC (copper MOF) lost 40% of sorption capacity within the FIRST 15 cycles: degradation is front-loaded.
- Tested 7 powder/granule materials + 3 composites across silica gels, zeolites, AlPO/SAPO, MOFs under continuous water-vapor thermal cycling.
- Method: short-cycle thermogravimetric screening of powders + custom life-cycle rig for composites; early-cycle screening essential because most loss is initial.
- Water-working-fluid systems impose hydrothermal stress some structured materials (esp. Cu MOFs) cannot survive.
- The rare hard N-cycle degradation datapoint.