A master thesis from Aalborg University
Empirical and theoretical modelling of solar shading factor
[Empirisk og teoretisk modellering af solafskærmningsfaktoren]
Author(s)
Term
4. term
Publication year
2012
Submitted on
2012-06-13
Pages
202 pages
Abstract
Projektet omhandler udviklingen af en model til bestemmelse af g-værdien for et glas system indeholdende udvendige persienner. Dette er gjort igennem tilgængelig litteratur og forsøg. To hovedparametre er undersøgt. Disse inkluderer solafskærmningsfaktoren for persiennerne samt den udvendige overgangsisolans af vinduet på grund af ændret luft flow sammenlignet med et vindue uden persienner. Igennem forsøg er kun lamelvinklen varierende mens der i den teoretiske del er taget hensyn til både lamelvinkel og indfaldsvinkel. Hastighedsprofilet i hulrummet imellem vindue og persienner er målt for bestemmelse af typen af flow. Solindstrålingen gennem vinduet, med og uden persienner, er målt for at kunne beregne solafskærmningsfaktoren for persiennerne. Den teoretiske model er sammenholdt med målinger udført i laboratorie.
The scope of the project is to develop a model for calculation of the g-value of a glazing system including Venetian blinds. This is done through present available literature and experiments. Two main parameters are investigated. This includes the shading factor of the Venetian blinds and the exterior heat transfer coefficient on the outside of the glazing due to a change in airflow compared to glazings with no use of shading. Through experiments only the slat angle is varying while the theoretical models are varying dependent on both radiation angle and slat angle. The velocity profile in the cavity is measured to study the type of air flow. The solar radiation through the window, both with and without shading, is measured for calculation of the shading factor of the Venetian blind. The theoretical models are evaluated and compared with measurements done in a laboratory.
Keywords
Solafskærmning ; Solafskærmningsfaktor ; Persienner ; Indfaldsvinkel ; U-værdi ; g-værdi ; Teori ; Forsøg ; Optiske egenskaber ; Transmission ; Refleksion ; Absorption ; Vindue ; Glas system ; Lamelvinkel ; Lameller ; Energibalance ; Solindstråling ; Litteraturstudie ; ParaSol ; WINDOW ; WIS ; Konvektion ; Stråling ; Randbetingelser ; MATLAB ; Pyranometer ; LUX meter ; Termoelement ; Anemometer ; Fri konvektion ; Tvungen konvektion ; solafskærmningsfaktor ; teori ; forsøg ; optiske egenskaber ; transmission
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