Dramatically enhanced thermal properties for TiO2-based nanofluids for being used as heat transfer fluids in concentrating solar power plants
URI (for links/citations):https://www.sciencedirect.com/science/article/pii/S0960148117310182#!
Ясинский, А. С.
Juan, Jesús Gallardo
Elisa I. Martín
Desireé De, Los Santos
Институт цветных металлов и материаловедения
Кафедра металлургии цветных металлов
Journal Name:Renewable Energy
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Ясинский, А. С. Dramatically enhanced thermal properties for TiO2-based nanofluids for being used as heat transfer fluids in concentrating solar power plants [Текст] / А. С. Ясинский, Navas Javier, Aguilar Teresa, Alcántara Rodrigo, Jesús Gallardo Juan, Sánchez-Coronilla Antonio, Elisa I. Martín, Los Santos Desireé De, Fernández-Lorenzo Concha // Renewable Energy. — 2018. — № 119. — С. 809-819
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
The paper presents an analysis of the properties of TiO2-based nanofluids such as their physical stability and heat transfer performance. The nanofluids were prepared with a eutectic mixture of diphenyl oxide and biphenyl with the addition of TiO2 nanoparticles and 1-octadecanethiol (ODT), used as a surfactant. The nanofluids were tested to determine their thermal and physical properties, such as stability, density, viscosity. The introduction of TiO2 nanoparticles accompanied with equal quantity of ODT was seen to sharply enhance the properties of the system in terms of heat transfer in concentrating solar power (CSP) plants. In particular, the system became stable after 3–5 days, and the settlement rate depended on the nanoparticle concentration. There was a slight increase in density and viscosity of no more than 0.12% and 4.85%, respectively. The thermal properties improved significantly, up to 52.7% for the isobaric specific heat and up to 25.8% for the thermal conductivity. The dimensionless Figure of Merit parameter (FoM), which is based on the Dittus-Boelter correlation, was used as a criterion for evaluating efficiency. At all the temperatures tested the nanofluid with 2.5·10−4 wt% (volume fraction of 2.44%) of TiO2 performed best, increasing the efficiency by up to 35.4% with regard to the pure heat transfer fluid (HTF) used in CSP plants. Thus, nanofluids based on TiO2 nanoparticles seem to be a promising alternative to HTFs in CSP plants.