Development of Composite PCMs by Incorporation of Paraffin into Various Building Materials

Abstract

In this research, we focused on the development of composite phase-change materials (CPCMs) by incorporation of a paraffin through vacuum impregnation in widely used building materials (Kaolin and ground granulated blast-furnace slag (GGBS)). The composite PCMs were characterized using environmental scanning electron microscopy (ESEM), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. Moreover, thermal performance of cement paste composite PCM panels was evaluated using a self-designed heating system. Test results showed that the maximum percentage of paraffin retained by Kaolin and GGBS was found to be 18% and 9%, respectively. FT-IR results show that CPCMs are chemically compatible. The phase-change temperatures of CPCMs were in the human comfort zone, and they possessed considerable latent-heat storage capacity. TGA results showed that CPCMs are thermally stable, and they did not show any sign of degradation below 150 °C. From thermal cycling tests, it was revealed that the CPCMs are thermally reliable. Thermal performance tests showed that in comparison to the control room model, the room models prepared with CPCMs reduced both the temperature fluctuations and maximum indoor center temperature. Therefore, the prepared CPCMs have some potential in reducing peak loads in buildings when applied to building facade.

Development and optimisation of phase change material-impregnated lightweight aggregates for geopolymer composites made from aluminosilicate rich mud and milled glass powder

“…Nonetheless, the performance of this ME-LWA stands out when compared to other PCM composite materials developed by other researchers. For example, a form-stable PCM composite material made by incorporating dodecyl alcohol into ground granulated blast furnace slag also through vacuum impregnation only achieved 22.51 J/g [25], while the specific latent heat of melting achieved for a Paraffin-Kaolin composite was only 27.88 J/g [26]. Finally, the overall heat storage capacity achieved by commercial microencapsulated PCM is approximately 51 J/g when used in surface cooling systems and 55 J/g for the stabilisation of indoor temperature in the comfort zone [27].…”

Development of pentadecane/diatomite and pentadecane/sepiolite nanocomposites fabricated by different compounding methods for thermal energy storage

“…6 PCM/mineral composites have recently attracted attention as PCM nonleaking materials. Many different minerals and materials, such as kaolin, 7 diatomite, [8][9][10][11] sepiolite, 4,12 bentonite, 13 perlite, 8,9,14 SiO 2,15 attapulgite, 16 vermiculite, 8,9 fly ash, 17 opal, 18 and xonotlite, 3 can be included in these composites. Although some of them are not clay or not even mineral, composites made from these materials described in the literature are called clay mineral-based composites.…”

Rheological Issues of Phase Change Materials Obtained by the Complex Coacervation of Butyl Stearate in Poly Methyl Methacrylate Membranes

“…Depending on how it is formed, the membrane around the phase transformation material can be used for simple coacervation or complex coacervation. If an interaction between the solution of a single polymer and the encapsulated substance is achieved, the process is simple coacervation, and if the coacervation is accomplished by an interaction between two polymers, it is called compound or complex coacervation [21][22][23][24]. Currently, the coacervation process of macromolecular compounds is considered the process by which a biphasic system is formed by stratification [25][26][27].…”