Classification of indoor daylight enhancement systems

Nair, M. Thamban; Ramamurthy, K.; Ganesan, A. R.

doi:10.1177/1477153513483299

Cited by 50 publications

(20 citation statements)

References 68 publications

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“…For each layer, component matrices R f f , T f b , T b f , R bb of a size determined by the chosen target resolution are filled by sampling the tensor-tree for all pairs of incident and outgoing directions. The propagation matrix Λ is initialized (see Equation (5)) according to chosen resolution k. The components of the BSDF S are calculated according to Equation (3). The resulting components are again flipped to match the different conventions of front and back side in RADIANCE.…”

Section: Pair-wise Combination Of Bidirectional Scattering Distributimentioning

confidence: 99%

“…Only the distributions over the transmission hemisphere are plotted, although all four components of the BSDF L s are computed and required according to Equation (3). The scattering layer of CFS1 shows no distinct peak in the transmission distribution as direct transmission is blocked at the the high elevation angle θ i = 50 • (a).…”

Section: Computed Bsdfs Of the Fenestration Layersmentioning

confidence: 99%

“…Operation of artificial lighting can be minimized due to the increased supply of daylight and the reduced need to operate sun-shades. Demand for cooling decreases due to lower internal gains by lighting and the control of solar gains [1][2][3]. Typical CFSs comprise a set of co-planar, clear and scattering layers.…”

Section: Introductionmentioning

confidence: 99%

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Computational Combination of the Optical Properties of Fenestration Layers at High Directional Resolution

Grobe

2017

Buildings

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Abstract:Complex fenestration systems typically comprise co-planar, clear and scattering layers. As there are many ways to combine layers in fenestration systems, a common approach in building simulation is to store optical properties separate for each layer. System properties are then computed employing a fast matrix formalism, often based on a directional basis devised by JHKlems comprising 145 incident and 145 outgoing directions. While this low directional resolution is found sufficient to predict illuminance and solar gains, it is too coarse to replicate the effects of directionality in the generation of imagery. For increased accuracy, a modification of the matrix formalism is proposed. The tensor-tree format of RADIANCE, employing an algorithm subdividing the hemisphere at variable resolutions, replaces the directional basis. The utilization of the tensor-tree with interfaces to simulation software allows sharing and re-use of data. The light scattering properties of two exemplary fenestration systems as computed employing the matrix formalism at variable resolution show good accordance with the results of ray-tracing. Computation times are reduced to 0.4% to 2.5% compared to ray-tracing through co-planar layers. Imagery computed employing the method illustrates the effect of directional resolution. The method is supposed to foster research in the field of daylighting, as well as applications in planning and design.

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Section: Pair-wise Combination Of Bidirectional Scattering Distributimentioning

confidence: 99%

Section: Computed Bsdfs Of the Fenestration Layersmentioning

confidence: 99%

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Computational Combination of the Optical Properties of Fenestration Layers at High Directional Resolution

Grobe

2017

Buildings

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“…The most efficient daylighting systems for moderate climates seem to be automatically controlled blinds and louvres, because of their flexibility to respond to different daylighting conditions. A recent literature review (Nair et al, 2013) concluded that active systems, with for example sun tracking mirrors or lenses, can optimally collect daylight and with this offer high energy saving potential. Nonetheless, they are typically complex and relatively expensive and require regular maintenance.…”

Section: Use Of Daylighting Systemsmentioning

confidence: 99%

Retrofitting the Electric Lighting and Daylighting Systems to Reduce Energy Use in Buildings: A Literature Review

Dubois¹,

Bisegna²,

Gentile³

et al. 2015

Energy Research Journal

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This paper presents a literature review about energy-efficient retrofit of electric lighting and daylighting systems in buildings. The review, which covers around 160 research articles, addresses the following themes: (1) retrofitting electric lighting in buildings, (2) electric lighting energy use and saving potential and (3) lighting retrofit strategies. The retrofit strategies covered in the review are: replacement of lamp, ballast or luminaire; use of task-ambient lighting design; improvement in maintenance; reduction of maintained illuminance levels; improvement in spectral quality of light sources; improvement in occupant behavior; use of control systems; and use of daylighting systems. The review indicates that existing general knowledge about lighting retrofit is currently very limited and that there is a significant lack of information concerning the actual energy performance of lighting systems installed in the existing building stock. The resulting key directions for future research highlights issues for which a better understanding is required for the spread and development of lighting retrofit.

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“…Other relevant and innovative contributions in the field of skylight design are reported in [17,18]. Furthermore, light guides and other daylighting enhancement systems were analyzed but not considered at this preliminary stage of the research [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Daylighting Conditions in a Virtual Underground City

Alcini¹,

Schiavoni

Asdrubali

2015

Journal of Daylighting

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From the Piranesi fantastic architectures to the animation movies and video games of the last thirty years, a new design approach has been introduced and developed: the design of the virtual space. Designing the "virtual" means experiencing a multidisciplinary approach where architecture, engineering, and urban planning meet the new horizons of information and communication technology. This study is focused on virtual space, which is an underground city. Mankind have always made and used underground environments: the possibilities of unlimited spaces to potential development, the reduced needs for raw materials for the construction and the protection from outdoor weather are some of the reasons that prompted humans to the realization of underground spaces in the past. These reasons and the availability of innovative technologies could encourage a breakthrough in the realization of new underground environments. A recent example is represented by the Underground City of Montreal (RÉSO). We present the architectural design of a virtual underground city, which is called Arch [ane], and its evaluation. The underground city is modular and the studied module is composed of eight floors with a total depth of 400 m and dimensions of 800 m × 800 m. The study comprises the evaluation of the effect of sunlight on each eight floors of the city. Daylighting simulations were performed considering different cities at different latitudes, days, and hours. The results have shown that the particular design of the underground city with skylights gives significant values of illuminance at a certain depth. Furthermore, the simulation results show how huge can be the potentialities of software to simulate extremely big environments.

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Classification of indoor daylight enhancement systems

Cited by 50 publications

References 68 publications

Computational Combination of the Optical Properties of Fenestration Layers at High Directional Resolution

Computational Combination of the Optical Properties of Fenestration Layers at High Directional Resolution

Retrofitting the Electric Lighting and Daylighting Systems to Reduce Energy Use in Buildings: A Literature Review

Simulation of Daylighting Conditions in a Virtual Underground City

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