Development leads to an increment in the demand for energy. Conventional sources of energy are fulfilling our energy demands but they are crossing environmental barriers resulting in adverse climatic change. Renewable source of energy is becoming popular as a solution to the energy crisis. To reduce the gap between energy demand and supply, energy storage methods should be developed more. In this paper, performance improvement of phase change material for energy storage purposes has been investigated. NaNO3/KNO3, which is a salt hydrate, is used as a phase change material. The weight proportion of NaNO3 and KNO3 is 55% and 45%, respectively. TiO2 is used as an additive for performance improvement of phase change material in nanoparticle form with different particle sizes of 10, 20, and 30 nm. All the abovementioned nanoparticles were blended with phase change material (PCM) to make three different samples for testing. The weight percentage of TiO2 is constant in every sample, which is 5%. Specific heat, thermal conductivity, charging, and discharging of PCM have been measured for different particle sizes along with the effects of temperature variation on the abovementioned properties. Specific heat has shown an increment by 16%, 20.5%, and 23.6%, and thermal conductivity has shown a decrement by 13%, 16.5%, and 21.5% for 10, 20, and 30 nm particle sizes, respectively. Blending with TiO2 has increased the rate of heating and decreased the rate of cooling of phase change material.
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