Abstract:This paper focuses on the characterization and modeling of a solid/gas thermochemical reaction between a porous reactive bed and moist air flowing through it. The aim is the optimization of both energy density and permeability of the reactive bed, in order to realize a high density thermochemical system for seasonal thermal storage for house heating application. Several samples with different implementation parameters (density, binder, diffuser, porous bed texture) have been tested. Promising results have been reached: energy densities about 430-460 kWh.m -3 and specific powers between 1.93 and 2.88 W.kg -1 of salt. A model based on the assumption of a sharp reaction front moving through the bed during the reaction was developed. It has been validated by a comparison with experimental results for several reactive bed samples and operating conditions. Keywords:Thermochemical process, seasonal thermal storage, sharp front model, high-density reactive salt, permeability.

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This paper investigates an innovative open thermochemical system dedicated to high density and long term (seasonal) storage purposes. It involves a hydrate/water reactive pair and operates with moist air. This work focuses on the design of and experimentation with a large scale prototype using SrBr 2 /H 2 O as a reactive pair (400 kg of hydrated salt, 105 kWh of storage capacity and a reactor energy density of 203 kWh/m 3). Promising conclusions have been obtained regarding the feasibility and performance of such a storage process. Hydration specific powers from 0.75 to 2 W/kg have been reached for a bed salt energy density of 388 kWh/m 3. Moreover, two important parameters that control the storage system have been identified and investigated: the equilibrium drop and the mass flow rate of moist air. Both have a strong influence on the reaction kinetics and therefore on the reactor's thermal power.

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Preoperative embolization is associated with minimal intraoperative blood loss. It does not increase the complication rate or impair operative dissection, and improves the chances of performing conservative surgery.

This paper focuses on the study of a solid/gas thermochemical reaction between a porous reactive bed and vapor. The objective is to determine the operating mode, either closed or open system, that best suits the requirements of a thermochemical seasonal storage applied to house heating. These two working modes have been compared thanks to two validated 2D models. This study shows that for the chosen set of parameters, the two operating modes lead to close global performances (the average specific power is 0.96 and 1.13 W/kg respectively for open and closed operating mode). Thus, the open thermochemical reactor, which presents technical advantages (easier conception and management, lower cost, …), is a promising way to implement a thermochemical process as long-term heat storage. Moreover, simulations allow identifying the main limitations for each working mode and the ways to reduce them. Nomenclature c molar heat capacity, J•mol -1 •K -1 standard enthalpy of reaction, J•mol -1 s c m heat capacity, J.kg -1 •K -1 standard entropy of reaction, J•mol -1 s •K -1