Research Papers

A Smart Window for Angular Selective Filtering of Direct Solar Radiation

[+] Author and Article Information
Rustam S. Zakirullin

Faculty of Architecture and Construction,
Orenburg State University,
Pobedy Avenue 13,
Orenburg 460018, Russia
e-mail: rustam.zakirullin@gmail.com

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering: Including Wind Energy and Building Energy Conservation. Manuscript received December 8, 2018; final manuscript received June 12, 2019; published online July 8, 2019. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 142(1), 011001 (Jul 08, 2019) (5 pages) Paper No: SOL-18-1565; doi: 10.1115/1.4044059 History: Received December 08, 2018; Accepted June 13, 2019

Thin-film grating coatings are proposed for smart windows to angular selective filtering of solar radiation. The gratings are formed by absorptive, reflective, or scattering parallel strips (made of chromogenic or other materials) alternating with directionally transmissive strips (untreated surface of pure glass) on two surfaces of the window pane(s). The smart window with grating optical filter has angular selective light transmission and partially or completely blocks the direct solar radiation in a preset angular range and transmits the scattered and reflected radiation without using the daylight redistribution devices. The results of numerical simulation and experimental confirmation of optimum slope angle of the strips on the pane(s), their widths, and relative position on two surfaces to minimize the directional light transmission of the window at the preset date and time of day taking into account orientation of the window to the cardinal, the latitude of the building, and the seasonal and daily distribution of the solar radiation intensity are demonstrated.

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Grahic Jump Location
Fig. 1

Smart window with thin-film grating coatings. Θ is the incidence angle, Θc is the characteristic angle of the filter, s is the distance between gratings, δ is the shift of gratings relative to each other, γ is the slope angle of the filter's gratings, c1 and c3 are the widths of the transmissive strips, and c2 and c4 are the widths of the non-transmissive strips.

Grahic Jump Location
Fig. 2

Experimental model of a double-glazed window with grating filter

Grahic Jump Location
Fig. 3

Coordinates of traces of the point of incidence of the solar beam on the input surface of the filter on its output surface

Grahic Jump Location
Fig. 4

Determination of projections of the traces of the incidence point on a plane perpendicular to the strips of the filter's gratings. 0 is the incidence point on the input gratings surface, 01 and 0′1 are the traces of point 0 on the output gratings surface at the characteristic angle and an arbitrary incidence angle, 02 and 0′2 are the projections of the points 01 and 0′1 on the plane perpendicular to the strips, and Δ is a shift between filter's gratings at the characteristic angle and arbitrary incidence angle.

Grahic Jump Location
Fig. 5

Theoretical angular characteristics of the filters at different average incidence angles and light transmittances

Grahic Jump Location
Fig. 6

Calculated, corrected, and experimental angular characteristics of the filters at the same average incidence angle and the different light transmittances



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