Conceptual design and performance evaluation of an innovative high temperature ceramic heat exchanger

Zavattoni, Simone and Cornolti, Luca and Arrivabeni, Edoardo and Puragliesi, Riccardo and Ortona, Alberto and Barbato, Maurizio (2021) Conceptual design and performance evaluation of an innovative high temperature ceramic heat exchanger. In: Journal of Physics: Conference Series 8th European Thermal Sciences Conference (EUROTHERM), 20/23 - 09 - 2021, Online.

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Abstract

The development of an innovative and highly efficient heat exchanger (HE) solution for gas-gas heat recovery is one of the major objectives of the HYDROSOL-beyond project which aims at enhancing the process efficiency for producing H2 from water dissociation with concentrated sunlight. Because of the very high temperature level of the process (up to 1'400°C), an innovative ceramic HE was proposed with an integrated lattice structure, as secondary surface, to maximize the heat transfer. To assist the design of the HE, a multiscale approach was adopted: a 1D model based on global correlations was developed and a 3D computational fluid dynamics model of the secondary surfaces were generated. The former was applied to assess the performance of the entire HE; while, the latter was exploited to study in detail the thermo-fluid dynamics behavior of a HE core element and to provide the global correlations to be integrated into the 1D model. The effect of the number of lattice layers, located into each channel, on the HE effectiveness was evaluated showing that reducing the height of the secondary structure allows to improve the HE effectiveness from 72% up to 94%.

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