Designer Sorbents – Structured systems for heat pumps

The energy required for heating and cooling in the Netherlands is roughly 40% of the total annual energy consumption. Thermally driven heat pumps and chillers, based on the reversible adsorption of a vaporous working fluid on a solid adsorbent, could be employed to reduce energy demands and subsequently CO2-emissions. Residual waste heat or even solar energy could be used to drive refrigeration and air-conditioning processes. Most adsorption heat pumps make use of water as working fluid and either zeolites or silica gels as solid sorbents. Main drawbacks are low efficiencies and large volume and weight compared to conventional compressor driven heat pumps. This projects aims at investigating the use of a novel sorbent material in heat pumps, metal-organic Frameworks (MOFs). This novel versatile class of solids consists of metal ions connected by organic ligands. The inherent variability and porosity of these MOFs make them ideal candidates for heat pumps. The tailoring and assessment of these MOFs in heat pumps will be based on a conjunction of molecular simulations and various experiments.