Improving Materials for Compact Thermal Energy Storage: Two Case Studies on Tailor-Made Polyalcohol Mixtures (PCMs) and Composites of Chlorides Confined in Gamma-Alumina or Silica-PEG (TCMs)
Résumé
determined in appropriate conditions for space heating (adsorption at 30 °C under a water vapor pressure of 12.5 mbar, and desorption at 100 °C). The composites were ranked as follows: γ-alumina-10LiCl (711 kWh.m -3 ), γ-alumina-10CaCl 2 (700 kWh.m -3 ) and γ-alumina-7MgCl 2 (334 kWh.m -3 ). The second type of composites is made of a silica-PEG matrix and of MgCl 2 or CaCl 2 . Experiments in an open lab-scale reactor demonstrated that the silica-PEG matrix effectively stabilized hydrated 25 wt.% MgCl 2 and 36 wt.% CaCl 2 . Among these, the composite with 25 wt.% of MgCl 2 showed the best performance, with an average heat storage density of 216 kWh.m -3 (adsorption at 30 °C under a water vapor pressure of 12.1 mbar, and desorption at 130 °C).