Block beam solar just blocks direct beam solar radiation on the window.
For a south oriented facade, block beam solar can be achieved for normal Venetian blind geometries by leaving the blind essentially open (slat angle phi_b = 90 deg or close to that) during a large portion of summer. This depends of course on such parameters as latitude, slat width and slat pitch.
Depending on the reflectivity of your slats, a significant amount of solar radiation reflected by the slats may still enter your zone.
In these cases a fixed slat angle of 45 deg will certainly reduce solar heat gain much better than the block-beam-solar angle.
Block-beam-solar is not optimal in a the sense of solar heat gain reduction. If you look at daylighting or view through potential, block beam solar is one of the strategies to consider.
On 08/12/2012 03:19 PM, Geert Bellens wrote:
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