Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 147, Issue 2, Pages 1125-1142Publisher
SPRINGER
DOI: 10.1007/s10973-020-10390-x
Keywords
Hybrid nanocomposite; Energy efficiency; CPV/T; Thermal storage
Funding
- Sunway University [STR-RCTR-RCNMET-001-2019]
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In this research, a new hybrid graphene-silver nanomaterial was used with paraffin wax as a phase change material (PCM) to improve its thermo-physical properties. The thermal and electrical energy efficiencies of the synthesized nanocomposite (PCM/graphene-silver) were investigated in solar thermal collector systems. The results showed that the hybrid nanocomposite exhibited improved specific heat capacity, thermal conductivity, and energy efficiency compared to the pure PCM.
In this research work, novel hybrid graphene-silver (Gr-Ag) nanomaterial has been used for first time with paraffin wax as a phase change material (PCM) to improve its thermo-physical properties. Thermal and electrical energy efficiencies of the novel synthesized nanocomposite (PCM/graphene-silver) has been investigated in solar thermal collector systems (CPV/T). This paper focuses on preparation, characterization, thermo-physical properties and energy efficiency in concentrated photovoltaic/thermal (CPV/T) system of new class of nanocomposites induced with hybrid Gr-Ag nanomaterial in three different concentrations. The specific heat capacity (c(p)) of hybrid PCM/graphene-silver nanocomposite increased by introducing hybrid Gr-Ag nanomaterial. Electrical and thermal energy performance of the hybrid PCM/graphene-silver is investigated in a CPV/T system using MATLAB 2017b program. The improvement of c(p) is found to be similar to 40% with 0.3 mass% of hybrid Gr-Ag nanomaterial loaded in PCM. The highest thermal conductivity increment is found to be similar to 11% at 0.3 mass% concentration of hybrid Gr-Ag nanomaterial in PCM. The endothermic enthalpy value of the hybrid PCM/graphene-silver nanocomposite is found to be similar to 75.6 J g(-1) at 0.1 mass% loading concentration of hybrid Gr-Ag nanomaterial. Melting point of hybrid PCM/graphene-silver nanocomposite with loading concentration of 0.3 mass% is measured to be 73.2 degrees C. The highest thermal efficiency using the hybrid graphene-silver nanoparticles reached the value of 39.62% which represents 4.16% increment in comparison with the pure PCM. The equivalent electrical efficiency is improved by 2.8% at the loading concentration of 0.3 mass% of the hybrid Gr-Ag nanomaterial. These new class of nanocomposites represented the capability of enhancement in the performance of the CPV/T system consisting of lower PV temperatures, higher temperature gains across the cooling fluid and higher electrical and thermal efficiencies. [GRAPHICS] .
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