Hydration and Dehydration of CaO/Ca(OH)_2 and CaCl_2/CaCl_2 * 6 H_2O-TGA/DSC studies - (PPT)

摘要

Thermal energy storage drives the change towards the use of renewable energy resources and energy efficiency. Thermal storage can be used for waste heat and solar thermal usage. Solar thermal systems work at temperatures between 120°C (space heating and hot tap water) and up to 600°C (CSP plants), where thermal energy storage is a key component. In comparison to most commonly used water or molten salt storage, thermochemical storage materials provide ten times or higher storage capacities per mass or volume and the ability to store heat for longer times without the need of insulation. Recently published results state MgCl_2 * 6 H_2O and CaCl_2 * 6 H_2O to be useful for space heating and hot tap water and Ca(OH)_2 for higher temperature levels. We reported earlier about our studies in MgCl_2 * 6 H_2O as pure and composite materials. In this paper we discuss the cycling stability of CaCl_2 * 6 H_2O and Ca(OH)_2.