Next Article in Journal
Effects of Copper Oxide Nanoparticles on Paddy Soil Properties and Components
Previous Article in Journal
New Antioxidant Multilayer Packaging with Nanoselenium to Enhance the Shelf-Life of Market Food Products
Previous Article in Special Issue
Correction: Chatterjee, A.; et al. Transition Metal Hollow Nanocages as Promising Cathodes for the Long-Term Cyclability of Li–O2 Batteries. Nanomaterials 2018, 8, 308
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Nanomaterials 2018, 8(10), 838; https://doi.org/10.3390/nano8100838

Radiation and Energetic Analysis of Nanofluid Based Volumetric Absorbers for Concentrated Solar Power

Institute for Thermodynamics, Leibniz University Hannover, Callinstraße 36, D-30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 31 July 2018 / Revised: 8 October 2018 / Accepted: 10 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Nanomaterials for Renewable and Sustainable Energy)
  |  
PDF [2767 KB, uploaded 16 October 2018]
  |  

Abstract

Recently, several publications gave attention to nanofluid based solar absorber systems in which the solar radiation energy is directly absorbed in the volume of the fluid. This idea could provide advantages over conventionally used surface absorbers regarding the optical and thermal efficiency. For the evaluation of this concept, a numerical approach is introduced and validated in this contribution. The results show that the optical efficiency of a volumetric absorber strongly depends on the scattering behavior of the nanofluid and can reach competitive values only if the particle size distribution is narrow and small. If this is achieved, the surface temperature and therefore the heat loss can be lowered significantly. Furthermore, the surface absorber requires very high Reynolds numbers to transfer the absorbed energy into the working fluid and avoid overheating of the absorber tube. This demand of pumping power can be reduced significantly using the concept of volumetric absorption. View Full-Text
Keywords: nanofluid; solar absorption; energy conversion; temperature distribution; spectral penetration depth; scattering; anisotropy nanofluid; solar absorption; energy conversion; temperature distribution; spectral penetration depth; scattering; anisotropy
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Eggers, J.R.; Lange, E.M.; Kabelac, S. Radiation and Energetic Analysis of Nanofluid Based Volumetric Absorbers for Concentrated Solar Power. Nanomaterials 2018, 8, 838.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Nanomaterials EISSN 2079-4991 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top