Preparation, Mechanical and Thermal Properties of Cement Board with Expanded Perlite Based Composite Phase Change Material for Improving Buildings Thermal Behavior

Abstract

Here we demonstrate the mechanical properties, thermal conductivity, and thermal energy storage performance of construction elements made of cement and form-stable PCM-Rubitherm® RT 28 HC (RT28)/expanded perlite (EP) composite phase change materials (PCMs). The composite PCMs were prepared by adsorbing RT28 into the pores of EP, in which the mass fraction of RT28 should be limited to be no more than 40 wt %. The adsorbed RT28 is observed to be uniformly confined into the pores of EP. The phase change temperatures of the RT28/EP composite PCMs are very close to that of the pure RT28. The apparent density and compression strength of the composite cubes increase linearly with the mass fraction of RT28. Compared with the thermal conductivity of the boards composed of cement and EP, the thermal conductivities of the composite boards containing RT28 increase by 15%–35% with the mass fraction increasing of RT28. The cubic test rooms that consist of six boards were built to evaluate the thermal energy storage performance, it is found that the maximum temperature different between the outside surface of the top board with the indoor temperature using the composite boards is 13.3 °C higher than that of the boards containing no RT28. The thermal mass increase of the built environment due to the application of composite boards can contribute to improving the indoor thermal comfort and reducing the energy consumption in the buildings.

Thermal Performance of Resource-Efficient Geopolymeric Mortars Containing Phase Change Materials

“…It can be observed that the difference of temperature amplitude between the enclosed part (right side) and imposed heating load (left side), for case without PCM was of 3°C, whereas the cases with 10% PCMs, 20%PCM and 30%PCM were associated to smaller internal temperature difference amplitudes of 3.3°C, 3.5°C and 4°C. These internal temperature differences at laboratory scale are consistent with the concept of improved heat capacity of the PCM mortars which, in turn, is in line with other studies [33]. The time delay between the maximum temperatures registered at the left side and right side for the case with 30% PCM was of nearly 3 min, in opposition to a smaller delay of 2.7 min (for the case with 20% PCM), 2.5 min (for the case with 20% PCM) and smaller delay associated to the case without PCM (1.5 min).…”

“…The results suggested that the PCM peak temperature shifts in the direction of the imposed flux, thus showing higher peaks for mortars with high PCM percentage. This trend has also been reported by others [27,33] and it can be explained by the increase in specific heat capacity. The representation of peak temperatures and the percentage of PCM in the mortars was made with two dashed lines that showed a clear linear relationship between them for both heating and cooling processes.…”

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

“…Obtaining the polymeric membrane can be accomplished by applying various micro and macro-encapsulation techniques such as immersion and direct incorporation. Thus, in order to avoid the occurrence of the leakage of phase change material, it is necessary to create a membrane with a higher melting temperature than the material with phase change, and to add certain compounds that allow the increasing viscosity of the PCM [14][15][16][17].…”

Investigation of glycerol-Ni(NO3)26H2O /perlite composites as form stable phase change materials

“…Expanded perlite (EP) is an amorphous glassy volcanic rock and having porous structure. Because it has very low thermal conductivity (0.03 -0.05W/m°C), low sound transition property and nonflammability it is generally used as insulation material in buildings (9,10). Also, some researchers reported that, EP have a good supporting matrix for preparing composite PCMs.…”