Development of Optical Fiber-Based Daylighting System and  Its Comparison

Ullah, Irfan; Whang, Allen Jong-Woei

doi:10.3390/en8077185

Cited by 50 publications

(22 citation statements)

References 33 publications

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“…Optical fibres also can be combined with solar concentrators for a building daylighting system (waveguides). They can deliver sunlight deep into the interior rooms of a building [19,20]. This technology allows to supply rooms without outside connection with natural daylight.…”

Section: Methodsmentioning

confidence: 99%

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

Gürlich¹,

Reber²,

Biesinger³

et al. 2018

Preprint

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Daylight usage in buildings improves visual comfort and lowers the final energy demand for artificial lighting. The question that always occurs is how much conservation can be achieved? New or rare materials and constructions have a lack of information about their application. Therefore, the current investigation quantifies the daylight and energy performance of a rare multilayer textile membrane roof. A translucent, thermal insulation with a glass fibre fleece between the two roof membranes combines daylight usage and heating demand reduction. A sports hall built in 2017 is used as a case study building with 2300 m 2 membrane roof surface. The optical properties of the roof construction are measured with a total visual light transmittance τv of 0.72 % for a clean surface. A climate-based annual daylight modelling delivers daylight indicators for different construction scenarios. The results show that in comparison to only one glass facade, the additional translucent and thermally insulated membrane roof construction increases the annual daylight autonomy (DA700) from 0 % to 1.5 % and the continuous DA700 from 15% to 38 %. In the roof-covered areas of the sport field, this results in a 30 % reduction of the electricity demand for artificial lighting from 19.7 to 13.8 kWhel/m²/a, when a dimming control is used. The study also found out, that the influence of the soiling of one layer decreases its light transmittance by a factor 0.81. Two soiled layers lower τv by a factor 0.66 to 0.47 %. This increases the electricity demand for lighting by only 12 %. The results should be very valuable as a comparison and benchmark for planners and future buildings of a similar type.

show abstract

Section: Methodsmentioning

confidence: 99%

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

Gürlich¹,

Reber²,

Biesinger³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The proposed collimator was designed using refractive elements instead of reflective elements due to their high efficiency [10], availability [4,5], and ease of use in the installation and manufacturing process [7].…”

Section: Collimator Designmentioning

confidence: 99%

“…After being refracted and reflected, the rays are directed toward the output surface. The transmitting subsystem guides the sunlight in the interior space through the light pipe or optical fiber [5][6][7]. Finally, the emitting subsystem helps to achieve a suitable illumination level in the interior.…”

Section: Introductionmentioning

confidence: 99%

Innovative light collimator with afocal lens and total internal reflection lens for daylighting system

Chen

Ullah

et al. 2015

Appl. Opt.

Self Cite

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This research presents a novel design of the collimator, which uses total internal reflection (TIR), convex, and concave lenses for the natural light illumination system (NLIS). The concept of the NLIS is to illuminate building interiors with natural light, which saves energy consumption. The TIR lens is used to collimate the light, and convex and concave lenses are used to converge the light to the required area. The results have shown that the efficiency in terms of achieving collimated light using the proposed collimator at the output of the light collector is better than that of a previous system without a collimator.

show abstract

“…They can deliver sunlight deep into the interior rooms of a building [22,23]. This technology allows supplying rooms without outside connection with natural daylight.…”

Section: Methodsmentioning

confidence: 99%

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

et al. 2018

View full text Add to dashboard Cite

Daylight usage in buildings improves visual comfort and lowers the final energy demand for artificial lighting. The question that always occurs is how much conservation can be achieved? New or rare materials and constructions have a lack of information about their application. Therefore, the current investigation quantifies the daylight and energy performance of a rare multi-layer textile membrane roof. A translucent, thermal insulation with a glass fibre fleece between the two roof membranes combines daylight usage and heating demand reduction. A sports hall built in 2017 is used as a case study building with 2300 m 2 membrane roof surface. The optical properties of the roof construction were measured with a total visual light transmittance τ v of 0.72% for a clean surface. A climate-based annual daylight modelling delivers daylight indicators for different construction scenarios. The results show that, in comparison to only one glass façade, the additional translucent and thermally insulated membrane roof construction increases the annual daylight autonomy (DA 700 ) from 0% to 1.5% and the continuous DA 700 from 15% to 38%. In the roof-covered areas of the sport field, this results in a 30% reduction of the electricity demand for artificial lighting from 19.7 kWh el /m 2 /a to 13.8 kWh el /m 2 /a, when a dimming control is used. The study also found that the influence of the soiling of one layer decreases its light transmittance by a factor 0.81. Two soiled layers lower τ v by a factor of 0.66 to 0.47%. This increases the electricity demand for lighting by only 12%. The results should be very valuable as a comparison and benchmark for planners and future buildings of a similar type.

show abstract

Development of Optical Fiber-Based Daylighting System and Its Comparison

Cited by 50 publications

References 33 publications

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

Innovative light collimator with afocal lens and total internal reflection lens for daylighting system

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

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