Increase of the ventilation effectiveness of solar chimneys with consideration of wind-effects applying CFD simulations and measurements

Lukas Schwan, Hannes Rütschlin, Madjid Madjidi, Thomas Auer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Solar chimneys have been used for natural ventilation and cooling in the Middle East already hundreds of years ago. In modern buildings, the concept could contribute to energy savings and reduction of greenhouse gas emissions. An optimized system would enable a sustainable and permanent operation of this natural ventilation concept. This study analyzes the effect of wind and the possibilities to increase the ventilation effectiveness of solar chimneys by optimizing the design of the chimney outlet. Computational fluid dynamic (CFD) simulations have been used to investigate the general influence of the wind effects on a building which is naturally ventilated with solar chimneys. The results show that the air change rate increases or decreases depending on the predominating wind direction. To be able to accomplish a system which supports the natural ventilation irrespective of the wind direction, different wind cowls were tested at a test rig located at the University of Applied Sciences Munich. As a result of this study, the flow velocity can be shown as a square root function of the wind speed. An average flow velocity between 0.6-1.1 m/s can be reached by using turbine ventilation systems.

Original languageEnglish
Title of host publicationISES Solar World Congress 2017 - IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2017, Proceedings
EditorsDavid Renne, Steven Griffiths, Manuel Romero, Ken Guthrie, Daniel Mugnier
PublisherInternational Solar Energy Society
Pages1820-1829
Number of pages10
ISBN (Electronic)9783981465976
DOIs
StatePublished - 2017
EventISES Solar World Conference 2017, SWC 2017 and 5th International Conference on Solar Heating and Cooling Conference for Buildings and Industry 2017, SHC 2017 - Abu Dhabi, United Arab Emirates
Duration: 29 Oct 20172 Nov 2017

Publication series

NameISES Solar World Congress 2017 - IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2017, Proceedings

Conference

ConferenceISES Solar World Conference 2017, SWC 2017 and 5th International Conference on Solar Heating and Cooling Conference for Buildings and Industry 2017, SHC 2017
Country/TerritoryUnited Arab Emirates
CityAbu Dhabi
Period29/10/172/11/17

Keywords

  • ANSYS FLUENT
  • CFD simulation
  • Energy savings
  • Natural ventilation
  • Solar chimney
  • Wind cowl

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