Thermal efficiency optimisation of mini-channel flat plate collectors using Pb(NO3)2–NaNO3–NaCl/BN-based phase change material storage

Advanced 3D-printed phase change materials

Solar energy is a renewable source of energy. The advantages of solar energy include its wide distribution, short cycle, high power, easy availability, and no pollution. As solar energy is seriously affected by changing weather, large-scale utilization of solar energy is restricted. Organic Phase Change Materials (PCMs) are an ideal thermal energy storage medium, and the development of solar-thermal energy conversion technology requires materials to effectively capture and store solar energy. However, PCMs have some characteristics that need improvement, such as low light-to-heat conversion rates. Therefore, this article added Biomass Porous Carbon (BPC) to improve the thermal conductivity and optical properties of PCMs. The experimentally determined thermal conductivity of 70% Paraffin Wax (PA)-(BPC) Composite PCM (CPCM) was 3.18 times higher than that of pure PA. In addition, the average absorbance in the range of 190–2000 nm was approximately 1.3, and approximately 95% of solar radiation was absorbed by the CPCM and stored as thermal energy. The photo thermal conversion efficiency of the CPCM was as high as 89.6%, thus infrared thermal image analysis was used to discover the positive effects of biomass porous materials on solar light capture and heat transfer. Therefore, composite BPC-based PCMs have broad application prospects in light-to-heat conversion and energy storage. Keywords Composite Phase Change Material; Energy Storage; Solar Energy; Absorbance; Light-To-Heat Conversion Rate.

Preparation and characterization of a solar-driven sodium acetate trihydrate composite phase change material with Ti4O7 particles

3D porous aerogel based-phase change materials with excellent flame retardancy and shape stability for both thermal and light energy storage

SiO2 hydrophilic modification of expanded graphite to fabricate form-stable ternary nitrate composite room temperature phase change material for thermal energy storage

Flexible engineering of advanced phase change materials

Lauric acid/stearic acid/nano-particles composite phase change materials for energy storage in buildings

Preparation and characteristics optimization of octadecanoic acid/octadecanol/expanded graphite based composite phase change materials for energy storage

Form-stable paraffin/high density polyethylene composites as solid–liquid phase change material for thermal energy storage: preparation and thermal properties

Effects of boron-nitride-based nanomaterials on the thermal properties of composite organic phase change materials: A state-of-the-art review

A composite phase change material (CPCM) of myristic acid/palmitic acid/sodium myristate (MA/PA/SM) has been proposed by impregnating a porous material of purified damar gum, also called Shorea javanica (SJ), to improve the thermal conductivity of CPCM. The thermal properties, thermal conductivity and thermal stability, of CPCM were measured using differential scanning calorimetry (DSC) thermal analysis, hot-disc thermal conductivity analyzer, and simultaneous thermal analyzer (STA). Moreover, a chemical reaction between fatty acid binary mixture and SJ in CPCM was evaluated by Fourier transform infra-red (FT-IR) spectrophotometer. The results of this study showed that the thermal conductivity of MA/PA/SM/SJ composite phase change material (CPCM) was improved by addition of 3 wt.% of Shorea javanica into MA/PA/SM eutectic mixture without showing a significant change in the thermophysical properties of CPCM. Moreover, the eutectic CPCM also does not show occurrence of chemical reaction between MA/PA/SM and SJ, and it has a good thermal performance and thermal stability. Therefore, the MA/PA/SM/SJ CPCM proposed in this study can be recommended as a new novelty material for thermal energy storage application.

Natural cellulose-based kapok fiber composite aerogel phase change materials with flame retardancy, fire warning, thermal energy storage and thermoelectric conversion.

Fabrication and characteristics of eutectic hydrated salts/fumed silica composite as form-stable phase change materials for thermal energy storage

Three-dimensional montmorillonite/Ag nanowire aerogel supported stearic acid as composite phase change materials for superior solar-thermal energy harvesting and storage

Household water heating systems incorporating phase change materials (PCMs) can store solar thermal energy and reduce energy consumption. MgCl2·6H2O–Mg(NO3)2·6H2O eutectics have a melting point near 60 °C with a large energy storage density suitable for use in the thermal energy storage unit of a water heating system. However, the low thermal conductivity of the eutectic limits its heat extraction rate. In this study, we combine the eutectic and expanded graphite (EG) to prepare a high thermal conductivity composite PCM and study its cycling performance over 200 thermal cycles. The thermal conductivity of the composite PCM increased from 0.5 to 3.7 W m−1 K−1, ensuring faster heating and cooling. The images obtained from scanning electron microscopy and leakage testing showed that the maximum loading mass fraction of the eutectic in the EG reached 85 wt %. Infrared spectra and X-ray diffractometry patterns confirm that composites with compositions between those of EG and the eutectic were composed of the physical mixture. Thermogravimetric analysis indicated that the composite PCM lost less mass at 300 °C compared to the pure eutectic, and differential scanning calorimetry demonstrated that the composite PCM had a melting point of 52.3 °C and a small subcooling degree of 2.7 °C, compared to 56.6 and 18.4 °C for the pure eutectic, respectively. All these measurements demonstrated that the composite PCMs changed less after 200 thermal cycles than the pure eutectic, which had an observable stratification caused by phase separation. The composite PCM developed was thermally conductive, shape-stabilized, and more thermally stable during cycling than the pure eutectic.