Hybrid Thermochemical Cycle for Cold and Electricity Cogeneration: Experimental Analysis of the Process Behavior and Expander-Reactor Coupling
Résumé
The valorisation of waste heat to respond to the increase demand on electricity and cooling is an important energetic challenge. For this purpose, an original hybrid thermochemical cycle is proposed: this sorption cycle is based on reversible endothermic/exothermic solid-gas reactions, and its originality lies in the integration of an expander on the gas line to provide mechanical work. This tri-thermal discontinuous cycle is able to recover medium grade waste heat (between 150 and 250 °C) to valorise it in a second step by providing cold production at its endothermic component and mechanical work-thanks to the expander-on the gas flow. Moreover, its two step operation leads to a storage functionality. While a previous study holds the thermodynamic stationary analysis of this cycle (Godefroy et al., ECOS 2019), this paper presents the experimental study part. A prototype of the hybrid thermochemical cycle, with MnCl2(6/2)NH3 (solid-gas reactants) and 1 kWe scroll expander, is developed at the laboratory. First experimentations on the prototype proved on a side the hybrid thermochemical concept by the simultaneous cold and mechanical productions during the whole reaction of the production phase, and on the other side they showed experimentally the mass coupling behaviour between the reactor and the expander in several operating conditions.
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