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.
Журнал: RENEWABLE ENERGY
Выпуск журнала: Vol. 119
Номера страниц: 809-819
ISSN журнала: 09601481
Место издания: OXFORD
Издатель: PERGAMON-ELSEVIER SCIENCE LTD
Информация о публикациях загружается с сайта службы поддержки публикационной активности СФУ. Сообщите, если заметили неточности.