Dramatically enhanced thermal properties for TiO2-based nanofluids for being used as heat transfer fluids in concentrating solar power plants

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1016/j.renene.2017.10.057

Ключевые слова: Concentrating solar power, Heat transfer fluids, Nanofluids, Thermal properties

Аннотация: 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. © 2017 Elsevier Ltd.

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Издание

Журнал: RENEWABLE ENERGY

Выпуск журнала: Vol. 119

Номера страниц: 809-819

ISSN журнала: 09601481

Место издания: OXFORD

Издатель: PERGAMON-ELSEVIER SCIENCE LTD

Авторы

  • Yasinskiy Andrey (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain; Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Dept Nonferrous Met Met, Krasnoyarsk, Russia)
  • Navas Javier (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)
  • Aguilar Teresa (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)
  • Alcantara Rodrigo (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)
  • Jesus Gallardo Juan (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)
  • Sanchez-Coronilla Antonio (Univ Seville, Fac Farm, Dept Quim Fis, E-41012 Seville, Spain)
  • Martin Elisa I. (Univ Seville, Dept Ingn Quim, E-41012 Seville, Spain)
  • De Los Santos Desiree (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)
  • Fernandez-Lorenzo Concha (Univ Cadiz, Fac Ciencias, Dept Quim Fis, E-11510 Cadiz, Spain)

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