Research on manufacturing thermal energy storage aggregate (TESA) for heat storage concrete (TESC)

Abstract

In the stituation of traditional energy sources becoming increasingly scarce, the reasonable and economical use of energy is necessary to reduce costs, protect the environment and ensure national energy security. One of the effective methods is to store thermal energy based on the use of phase changing materials. In this study, thermal energy storage aggregates were made from the combination of vaseline; keramzite/vermiculite/ perlite and liquid glass coating. The resulting aggregates have some characteristic properties compared to initial porous aggregates: the density increases significantly (> 1 kg/cm3); the mass increases sharply from 78.50 to 92.61%. And they have phase changing material absorbing capacity of 53.21 to 65.77% by mass. Their latent heat of fusion (around 100 J/g) significantly reduced compared to the original phase change material (143.68 J/g). They will be used to produce thermal energy storage concrete with phase change enthalpy > 6 J/g. Some main standard and non-standard methods used in the study include: Determination of density & water absorption of porous aggregate according to TCVN 7572-4:2006; mercury permeation method; analysis of material structure by scanning electron microscopy, determination of latent heat and melting temperature of samples & materials by differential scanning calorimetry.