Abstract
Here, we investigate the effect of adding nano-silica particles on the thermo-physical properties of the (Na0.6K0.4)NO3 based thermal energy storage systems. Five different systems tagged as M00, M01, M02, M03 and M04, with different nano-silica percentage of 0, 1, 2, 3, and 4 wt%, respectively, were prepared. Various experimental techniques were employed to study the thermo-physical properties of the systems during (solid-solid) phase P1, (solid-liquid) phase P2 and (liquid-solid) phase P3, and to clarify the effect of nano-silica on the thermal energy storage efficiency during both charging and discharging processes. According to the Differential Scanning Calorimeter (DSC) thermal analysis, it was found that the system M02 whose nano-silica addition rate of 2 wt%, has the most favorable thermal characteristics (i.e., highest specific heat and lowest enthalpy change). Moreover, the addition of 2 wt% represents the optimum distribution of nano-silica inside the principal base system M00. This leads to an improvement in the porosity of the system due to the degree of homogeneity caused by the thermophoresis effect distribution, the high surface area of the nano-silica with the activity of the M00 matrix alongside the degree of the alkalinity of nano-silica. Besides, the electric conductivity measurements showed that the 2wt% percentage is the optimum one for thermal energy storage systems.
Highlights
Thermal energy storage systems can be classified into sensible heat storage, latent heat storage and thermo-chemical heat storage
In contrast to previous studies, which addressed the impact of nano-particle on the thermal performance of Phase Change Materials (PCMs) thermal storage material, the current study is devoted to investigate the effect of nano silica on both the thermal and the physical properties of the binary molten salt 0.6NaNO3-0.4KNO3
Phase Change Materials (PCMs) based on latent heat energy storage techniques over a nearly isothermal temperature range using Paraffin Wax Nano composite Based on Carbon-Coated Aluminum Nano particles have been regarded (Chen et al, 2017, pp. 12603-12609)
Summary
Thermal energy storage systems can be classified into sensible heat storage, latent heat storage and thermo-chemical heat storage. The high thermal conductivity carbon-based, metal- fillers, porous materials, and nano-particles are commonly used as additives to enhance the thermal conductivity of the PCM Using of the metal-based porous material, such as metal foam enhances heat transfer by reducing the cell size leading to the large contact surface area In this case, the scattered air within the pores expands significantly to cause the ejection restriction of the phase transformation for the PCM during the actual operation at elevated temperatures The addition of graphite to the binary thermal storage system leads to enhance the thermal conductivity coefficient and reduced the total latent heat By grinding the dried composites, samples were obtained, after the operation process for all samples, they were immediately used for thermal, electrical, structure and electron macroscopic analysis, to identify the effect of the nano-silica on the thermo-physical properties for the (Na0.6K0.4)NO3, which is representing the thermal storage media
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