Investigation of convection-based energy systems using supercritical carbon dioxide as a working fluid

Download
  1. Get@NRC: Investigation of convection-based energy systems using supercritical carbon dioxide as a working fluid (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1002/er.1698
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleInternational Journal of Energy Research
ISSN0363-907X
Volume35
Issue4
Pages346357; # of pages: 12
SubjectCirculation loop; Energy systems; Environmental-friendly; Flow and heat transfer; Flow reversals; Geometric configurations; Heat transfer rate; High efficiency; Natural circulation loop; Nuclear power; Orders of magnitude; Solar thermal conversion; Supercritical carbon dioxide; Supercritical carbon dioxides; System efficiency; Temperature differences; Tube diameters; Volumetric efficiency; Working fluid; Carbon dioxide; Energy conversion; Fluids; Natural convection; Nusselt number; Retrofitting; Reynolds number; Waste heat; Waste heat utilization; Supercritical fluid extraction
AbstractCarbon dioxide is the best retrofit to meet the future demand on long-term environmental friendly working fluids. The volumetric efficiency of supercritical carbon dioxide is very high, which makes it a promising working fluid in convection-based energy systems with high efficiency and small volume. Here, the natural convection of supercritical carbon dioxide driven only by temperature difference is studied in circulation loops. The Reynolds number of the flow is about 104 when the temperature difference is only 20K, about two orders of magnitude greater than that of water. Furthermore, the heat transfer rate is about 3 times as great as that of water. These results demonstrate the potential of carbon dioxide as a working fluid in solar thermal conversion, nuclear power and waste heat utilization, etc. The influence of the tube diameter on the flow and heat transfer characteristics is discussed. Both the velocity and the Nusselt number are greater in the loop with a larger tube diameter where flow reversal occurs periodically. It is found that flow reversal degrades the system efficiency of the natural circulation loop. Therefore, the optimization about the geometric configuration of convection-based energy systems using carbon dioxide as a working fluid does exist and is very important for their safe and effective operation. Copyright © 2010 John Wiley & Sons, Ltd.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Fuel Cell Innovation (IFCI-IIPC)
Peer reviewedYes
NPARC number21271089
Export citationExport as RIS
Report a correctionReport a correction
Record identifier86a0b333-2d71-49bb-9d05-04d98a145e0c
Record created2014-03-24
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)