Development of a mathematical model for a curved slat venetian blind with thickness

A numerical analysis of the air ventilation management and assessment of the behavior of double skin facades

“…For satisfying these conditions, we introduce the concept of the profile angle limits. This concept indicates how the sunlight falls on the blind slats and how the sunlight passes through the blind slats without touching the slat [8]. The profile angle is the projection of the solar altitude angle (˛s) on a normal plane to the facade surface, is defined by: Fig.…”

“…The slat angle effect and the distance between the shading device and the glazing were investigated by Gratia et al [2], Mauricio [3] and Jiru et al [4]. Other important studies, such as, Pfrommer et al [5], Rosenfeld et al [6], Yahoda et al [7] and Chaiyapinunt et al [8], were interested in the definition of the solaroptical properties of a shading device, such as: the solar absorption and the solar transmission. These quantities help to assess the DSF thermal performances, especially when we use, the thermal-solar separation technique.…”

Effect of installing a venetian blind to a glass window on human thermal comfort

“…f p ¼ projected area factor. The shortwave transmittance of the blind (developed by Chaiyapinunt and Worasinchai [23]), dependent on the solar profile angle (angle of incidence in a plane perpendicular to the window and slat direction, f s ), can be written as (11) where t f blÀct ¼ front total transmittance of a curved venetian blind with thickness. t f blÀct;dir;dir ¼ front direct-to-direct transmittance (transmittance of direct solar radiation that passes directly through blind without touching slat surfaces) of a curved venetian blind with thickness.…”

“…transmits both shortwave and longwave radiation) and nonspecular. The followings studies considered the heat transmission through the glass window with an attached venetian blind: Klems [11,12]; Klems et al [13]; Klems and Warner [14]; Pfrommer et al [15]; Collins and Harrison [16]; Chantrasrisalai and Fisher [17]; EnergyPlus [18]; Yahoda and Wright [19]; Khun [20,21]; Wright et al [22]; Chaiyapinunt and Worasinchai [23,24], and Chaiyapinunt and Khamporn [25]. Only a very limited number of studies have considered thermal comfort aspects as part of the thermal performance of the glass window with the venetian blind.…”

Shortwave thermal performance for a glass window with a curved venetian blind

“…The effect of the blind thickness on the optical properties is also investigated from the geometry of a curved blind with thickness as shown in Fig. 3 by Chaiyapinunt and Worasinchai (2009a). The shortwave optical properties of the blind in the part of interreflection of the direct radiation between the slat surfaces is calculated by using the radiosity method on a six surface closed enclosure as shown in Fig.…”