Adsorptive Coatings based on Siloxane Binders for Heat Transformation Applications

The usage of low exergy heat as driving force for adsorption processes delivers an energy efficient way for heating and cooling. Adsorptive coatings are one possibility to enhance heat transfer and improve the specific heating or cooling power. This work presents results from coatings based on poly-dimethyl-diphenyl-siloxane binder, with variation of different adsorbents (MOFs, zeolites, and microporous materials) for water and methanol adsorption.

---

The usage of waste or low exergy heat as driving force for adsorption processes delivers an energy efficient way for heating and cooling. Adsorptive coatings are one possibility to enhance the heat transfer and improve the specific heating or cooling power (SCP/SHP). This work presents coatings based on a poly-dimethyl-diphenyl-siloxane (PDMDPS) binder, with a variation of different adsorbents from the group of metal-organic frameworks (Al-FUM, CAU-10-H, HKUST-1, MIL101-(Cr)), zeolites (Na-Y) and related microporous materials (SAPO-34, TiAPSO) for adsorption of water and methanol on 2D-substrates (plates and fins of a full scale tube-fin heat exchanger (HX)). Equilibrium adsorption loading X(tief)coat(p,T), coating thickness and density (d(tief)coat, (tief)coat), adsorption dynamic (t(tief)cycle) and influence through long term hydrothermal cycles are investigated as coating properties. A deeper understanding and more precise prediction of the adsorption process will be possible based on the acquired results, regarding efficiency (COP), storage density and power/power density (SCP/SHP, VSCP/VSHP).