NanoTech

Topics: Solar thermal energy, Energy, Solar thermal collector Pages: 14 (5108 words) Published: October 15, 2014
Digital Commons@
Loyola Marymount University
and Loyola Law School
Mechanical Engineering Faculty Works

Mechanical Engineering

1-1-2010

Nanofluid-Based Direct Absorption Solar
Collector
Todd Otanicar
Loyola Marymount University, totanicar@lmu.edu

P. E. Phelan
R. S. Prasher
G. Rosengarten
R. A. Taylor

Repository Citation
Otanicar, Todd; Phelan, P. E.; Prasher, R. S.; Rosengarten, G.; and Taylor, R. A., "Nanofluid-Based Direct Absorption Solar Collector" (2010). Mechanical Engineering Faculty Works. Paper 21.
http://digitalcommons.lmu.edu/mech_fac/21

Recommended Citation
Otanicar, T.P., Phelan, P.E., Prasher, R.S., Rosengarten, G., and Taylor, R.A., 2010, "Nanofluid-Based Direct Absorption Solar Collector," Journal of Renewable and Sustainable Energy, 2(3).

This Article is brought to you for free and open access by the Mechanical Engineering at Digital Commons@ Loyola Marymount University
and Loyola Law School. It has been accepted for inclusion in Mechanical Engineering Faculty Works by an authorized administrator of Digital Commons@

JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY 2, 033102 ͑2010͒

Nanofluid-based direct absorption solar collector
Todd P. Otanicar,1,a͒ Patrick E. Phelan,2 Ravi S. Prasher,2 Gary Rosengarten,3 and Robert A. Taylor2
1

Department of Mechanical Engineering, Loyola Marymount University, Los Angeles, California 90045, USA
2
School of Mechanical, Aerospace, Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, USA
3
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
͑Received 13 October 2009; accepted 23 April 2010; published online 26 May 2010͒

Solar energy is one of the best sources of renewable energy with minimal environmental impact. Direct absorption solar collectors have been proposed for a variety of applications such as water heating; however the efficiency of these collectors is limited by the absorption properties of the working fluid, which is very poor for typical fluids used in solar collectors. It has been shown that mixing nanoparticles in a liquid ͑nanofluid͒ has a dramatic effect on the liquid thermophysical properties such as thermal conductivity. Nanoparticles also offer the potential of improving the radiative properties of liquids, leading to an increase in the efficiency of direct absorption solar collectors. Here we report on the experimental results on solar collectors based on nanofluids made from a variety of nanoparticles ͑carbon nanotubes, graphite, and silver͒. We demonstrate efficiency improvements of up to 5% in solar thermal collectors by utilizing nanofluids as the absorption mechanism. In addition the experimental data were compared with a numerical model of a solar collector with direct absorption nanofluids. The experimental and numerical results demonstrate an initial rapid increase in efficiency with volume fraction, followed by a leveling off in efficiency as volume fraction continues to increase. © 2010 American Institute of Physics. ͓doi:10.1063/1.3429737͔

I. INTRODUCTION

Sustainable energy generation is one of the most important challenges facing society today. Solar energy offers a solution, with the hourly solar flux incident on the Earth’s surface being greater than all of the human consumption of energy in a year.1 The challenge lies in efficiently collecting and converting this energy into something useful. One of the principle methods of collection is through solar thermal collectors, which vary drastically in the amount of solar flux captured2,3 as well as the method for capture.4 The most common type of solar thermal collector utilizes a black surface as the absorber, which then transfers heat to a fluid running in tubes embedded within or fused onto the surface. In this case the efficiency is limited by not only how effective the absorber captures solar energy but also how effectively the heat is transferred to...
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