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Simple mathematical modeling and simulation to estimate solar-regeneration of a silica gel bed in a naturally ventilated vertical channel for Harare, Zimbabwe
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2014 (English)In: Energy Procedia, 2014, 1733-1742 p.Conference paper, Published paper (Refereed)
Abstract [en]

Passive air conditioning (humidity and temperature control) in buildings is more desirable on sustainable basis. One of the challenges of passive humidity control is regeneration of the materials applied for the purpose. This paper looks at solar regeneration of a silica gel layer (bed) for typical seasons of the year in Harare, Zimbabwe. This bed forms the primary system that is then used for drying room internal surfaces during the night. The extent of silica gel solar drying is the main attention of this investigation. Solar regeneration of a silica gel bed that forms a solar 'absorber' surface of a rectangular solar channel is investigated. Simple mathematical models are developed and subsequent spreadsheet simulations are carried out. Silica gel sorption models are from literature or estimated through curvefitting of available data. Solar radiation falling on a vertical surface at a given orientation is evaluated from the global solar radiation data using a developed simulator based on correlations obtained from literature and measured solar radiation data from the local meteorological department. For a vertical solar channel of an air gap of 20mm, and a height of 3m, silica gel is regenerated to some quite low moisture content of circa 0.06kg/kg. Comparable degree of regeneration is achieved for both seasons.

Place, publisher, year, edition, pages
2014. 1733-1742 p.
Keyword [en]
Passive humidity control, Silica gel layer (bed), Solar, Solar regeneration
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-167901DOI: 10.1016/j.egypro.2014.10.162ISI: 000348253201096Scopus ID: 2-s2.0-84922331467OAI: oai:DiVA.org:kth-167901DiVA: diva2:818897
Conference
2013 ISES Solar World Congress, SWC 2013, 3 November 2013 through 7 November 2013
Note

QC 20150609

Available from: 2015-06-09 Created: 2015-05-22 Last updated: 2016-12-05Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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