du.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses
Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
Show others and affiliations
2010 (English)In: Solar Energy, ISSN 0038-092X, Vol. 84, no 6, 997-1007 p.Article in journal (Refereed) Published
Abstract [en]

A new method for the calculation of a stratification efficiency of thermal energy storages based on the second law of thermodynamics is presented. The biasing influence of heat losses is studied theoretically and experimentally. Theoretically, it does not make a difference if the stratification efficiency is calculated based on entropy balances or based on exergy balances. In practice, however, exergy balances are less affected by measurement uncertainties, whereas entropy balances can not be recommended if measurement uncertainties are not corrected in a way that the energy balance of the storage process is in agreement with the first law of thermodynamics. A comparison of the stratification efficiencies obtained from experimental results of charging, standby, and discharging processes gives meaningful insights into the different mixing behaviors of a storage tank that is charged and discharged directly, and a tank-in-tank system whose outer tank is charged and the inner tank is discharged thereafter. The new method has a great potential for the comparison of the stratification efficiencies of thermal energy storages and storage components such as stratifying devices.

Place, publisher, year, edition, pages
Elsevier , 2010. Vol. 84, no 6, 997-1007 p.
Keyword [en]
Thermal stratification; Thermal energy storage; Solar heating systems; Thermocline
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:du-5247DOI: 10.1016/j.solener.2010.03.009ISI: 000278235200013OAI: oai:dalea.du.se:5247DiVA: diva2:520301
Projects
SolNET
Available from: 2011-01-26 Created: 2011-01-26 Last updated: 2014-10-01Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Bales, Chris
By organisation
Energy and Environmental Technology
In the same journal
Solar Energy
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 539 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf