Integration of thermally active materials during the formation of open porous metal structuresThursday (08.10.2020) 16:50 - 17:10
Heat exchangers are common components of thermodynamic systems and influence critically their overall performance. In several applications, e.g. waste heat or solar thermally driven cooling or sorptive dehumidification, heat exchangers have to be combined with thermally active materials like activated carbon or zeolites. Conventionally, the metallic heat exchangers are produced first and combined afterwards with the active material. This is done e.g. by means of filling of the structure with material (bulks of pellets/granules), or by means of coating of the heat exchanger surface (slurry coating or in-situ crystallization deposition). Alternatively, the integration of the active material can be done directly during the production of the support metal structure using metal casting and sintering techniques. In the presentation examples of processes and the resulting structures of this new approach will be shown. In more detail the production of sintered copper structures with integrated zeolite Y will be discussed. The heat and mass transfer characteristics of two samples that differ in grain size and metal structure have been evaluated. The measurements of adsorption equilibrium show that the water uptake capacity of zeolite Y in the sintered metal does not change in comparison to the original zeolite material. Furthermore, the results of the dynamic LTJ (large temperature jump) measurements indicate that the heat transfer characteristics of the composite structure are considerably improved when comparing them to the loose grains configuration.