WEB Mixtures of CaCl2 and MgCl2 Hydrates for Thermochemical Heat StorageWednesday (23.09.2020) 16:25 - 16:40 F: Functional Materials, Surfaces, and Devices 1 Part of:
Energy storage is now a major issue in the energy research; due to increased energy demand. The massive consumption of fossil fuel leads to large emission of CO2 and other greenhouse gases, using renewable energy sources like solar or wind energy is very important in reducing the consumption of fossil fuels. Thermochemical heat storage is one of the important research fields dealing with energy storage. Thermochemical heat storage is defined as storing the renewable heat energy in the form of reversible chemical reaction by using salt hydrates. Solar energy can be stored efficiently as heat energy using dehydration reactions into lower hydrate levels below 120 C which is achievable by solar collectors. After that the heat energy can be discharged by hydration of the dehydrated salt materials. As a result, one can obtain a fully renewable system for storing heat energy. In this study, salt mixtures are being investigated, which is another possibility for material optimization. Mixtures of CaCl2 and MgCl2 salts have a high potential for thermochemical heat storage applications [1,2]. Mixtures of these two salts lead to the formation of the double salt tachyhydrite, CaMg2Cl6.12H2O. The aim of this research is to determine the cycle stability of CaCl2 and MgCl2 salt mixtures, to find out whether tachyhydrite is a good material for thermochemical heat storage and, to find out its effect on the thermochemical behavior of the salt mixture. Experimental characterization of the phase transformations of CaCl2 and MgCl2 mixtures is done by Raman spectroscopy and XRD. Hydration and dehydration kinetics are investigated by water vapor sorption. Cycle stability and thermal analysis are done by calorimetry.
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