Experimental investigation of hydronic air coil performance with nanofluids

Experimental investigation of hydronic air coil performance with nanofluids •Experimental data on thermal and fluid dynamic performance of Al2O3 nanofluid and two base fluids in a real-world hydronic air coil are presented. Studies on nanofluids in hydronic coil are very rare in the literature, although for base fluids results are widely available.•This paper has focused on an ethylene glycol/water heat transfer fluid (60:40) by mass, which provides freeze protection down to −54 °C and is widely used in cold regions. For these regions, large amounts of fossil fuels are consumed for heating buildings, since the buildings are often heated for 8–9 months a year. Evaluation of the performance of nanofluids for such regions in this paper may contribute to potential reduction of energy related costs and emissions.•The study has found that under equal entrance velocity and temperature, on the liquid side of the coil, the base fluids may remain in the turbulent regime as it flows through the coil tubes. However, nanofluids may fall into transitional or laminar regime, because their viscosity relatively high, and is strongly dependent on the temperature.•The nanofluid Nusselt number is predicted well by the Dittus-Boelter equation, even in laminar to transition zones, due to the increased heat transfer and fluid friction by secondary flows in the bends.•Entropy generation or exergy analysis for nanofluids from experimental data is limited in the literature. This paper presents an entropy generation analysis showing that the nanofluid performs better than its base fluid under equal Reynolds number and equal heat transfer by showing lower amount of exergy destruction in the heat transfer and fluid friction process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Heat and Mass Transfer Elsevier

Experimental investigation of hydronic air coil performance with nanofluids

Loading next page...
 
/lp/elsevier/experimental-investigation-of-hydronic-air-coil-performance-with-Fw60ir8eRw
Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0017-9310
eISSN
1879-2189
D.O.I.
10.1016/j.ijheatmasstransfer.2018.02.112
Publisher site
See Article on Publisher Site

Abstract

•Experimental data on thermal and fluid dynamic performance of Al2O3 nanofluid and two base fluids in a real-world hydronic air coil are presented. Studies on nanofluids in hydronic coil are very rare in the literature, although for base fluids results are widely available.•This paper has focused on an ethylene glycol/water heat transfer fluid (60:40) by mass, which provides freeze protection down to −54 °C and is widely used in cold regions. For these regions, large amounts of fossil fuels are consumed for heating buildings, since the buildings are often heated for 8–9 months a year. Evaluation of the performance of nanofluids for such regions in this paper may contribute to potential reduction of energy related costs and emissions.•The study has found that under equal entrance velocity and temperature, on the liquid side of the coil, the base fluids may remain in the turbulent regime as it flows through the coil tubes. However, nanofluids may fall into transitional or laminar regime, because their viscosity relatively high, and is strongly dependent on the temperature.•The nanofluid Nusselt number is predicted well by the Dittus-Boelter equation, even in laminar to transition zones, due to the increased heat transfer and fluid friction by secondary flows in the bends.•Entropy generation or exergy analysis for nanofluids from experimental data is limited in the literature. This paper presents an entropy generation analysis showing that the nanofluid performs better than its base fluid under equal Reynolds number and equal heat transfer by showing lower amount of exergy destruction in the heat transfer and fluid friction process.

Journal

International Journal of Heat and Mass TransferElsevier

Published: Sep 1, 2018

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off