The Multicomponent Heat Storage Nanofluid with Phase Change Behaviour for Solar Power Stations
Аннотация
In this study, two nanofluids with phase change behaviour were produced by inclusive of nanoparticles, which can be used as heat transfer or thermal storage medium in solar thermal power stations. Silica (SiO2) with an average diameter of 30 nm was added to nanofluids in amounts of 0.063 and 1.0 weight percentage (wt %). Each nanofluid was prepared using a well-known method that involved diluting the fluids in water and sonicating and evaporating them. Measurements of the thermophysical properties were performed by differential scanning calorimetry (DSC) analysis. Specific heat (Cp) measurements show that up to 65°C the addition of 1.0 wt % silica nanoparticles indicate an increase in the Cp up to 37%, and the addition of 0.063 wt % shows increase up to 25%. The addition of 1.0 wt % silica nanoparticles demonstrates an increase in the Cp up to 39%, and the addition of 0.063 wt % shows a rise up to 31% in the range of temperatures 65–80°C. Furthermore, only 1.0 wt % silica nanoparticles added with nanofluid was investigated for Cp (J/Kg K) at higher temperatures between 100 and 450°C, and obtained results show only 8–17% enhancement, as this mass was more stable against mass fluctuations under heat flows.