Illumination performance and energy saving of a solar fiber optic lighting system

Lingfors, David; Volotinen, Tarja

doi:10.1364/oe.21.00a642

Cited by 45 publications

(22 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Light distribution from the daylighting transport system is done by the light transmission and scattering through the emitters. Depending on the system's design idea there can be just one distribution point at the end [104,16], many distribution points along the light guide [142,155,43], or the distribution can happen continuously along the guide [145,146]. Light emitters are produced as circular or square (prismatic or transparent) PMMA diffusers, or as radial lenses (Fresnel) in a luminaire form.…”

Section: Light Distribution Elementsmentioning

confidence: 99%

“…Fiber-optical daylight systems with the active [64,21,72] or passive [62,53] solar tracking, were patented and produced by different manufacturers [164,66]. Many studies were conducted addressing the light efficiency of those finished products [165,155,65]. An overview of daylighting systems on the market is presented in Table 3.…”

Section: Development Of Market Productsmentioning

confidence: 99%

See 1 more Smart Citation

Daylight Transport Systems for Buildings at High Latitudes

Obradović

Matusiak

2019

Journal of Daylighting

View full text Add to dashboard Cite

This paper is a literature study of daylight transport systems aiming at selecting the most appropriate ones for application at high latitudes. It is limited to the systems that transport light at a long distance from the façade and distribute it either in the building core or at a rear place in a room adjacent to the façade. The literature is spanning from the 80s' to the present. It covers the theoretical background and development of the systems from their infancy, through technical development of the design elements and to the adaptation of the systems to different climatic conditions. Since the most literature comes from equatorial and tropical climate, a short contextualization with high latitudes climate is included. Findings are systematized and presented in tables for easier comparison of efficiency, visual comfort, design efficacy, maintenance need, cost and/or availability on the market, and energy-saving potential in different climates. Conclusions confirm that the daylight condition at the location is the main prerequisite when deciding on the type of collector while the building structure and room functionality are the basis for choosing the type of the transport element. Finally, the distribution element showed to be the key factor when discussing applicability in a functional space where the final success depends on human acceptance. This paper can be useful to get an overview of performance characteristics and application preferences of different daylight transport systems or just their components in daylight conditions at high latitudes.

show abstract

Section: Light Distribution Elementsmentioning

confidence: 99%

Section: Development Of Market Productsmentioning

confidence: 99%

Daylight Transport Systems for Buildings at High Latitudes

Obradović

Matusiak

2019

Journal of Daylighting

View full text Add to dashboard Cite

show abstract

“…To address the associated challenge of climate change, most countries in the world have come together to sign the Paris Climate Agreement, 1 which has seen that the solar energy is playing a more and more important role in energy structure. 4 Direct daylighting from sunlight [5][6][7] is an important way to solve these problems. 3 There are some underground public places in our daily life such as underground car parks, tunnels, and basements, however, being in badly need of lighting all the time as a result of being not sunlit directly, which contributes to a greater energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…And public lighting is an important part of current energy consumption. 4 Direct daylighting from sunlight [5][6][7] is an important way to solve these problems. Sunlight optical fiber lighting was proposed in 1980, 8 which has become an important way of implementation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a large dish-type concentrator solar lighting system for underground car park

Song

Liao

et al. 2018

Int J Energy Res

View full text Add to dashboard Cite

Summary To utilize solar energy more efficiently and reduce lighting power consumption in underground public spaces such as car park, a large dish‐type concentrator solar lighting system is put forward along with its evaluation, which is a unique design to apply a laminated layer of beam split thin‐film coating and thin‐film solar cells onto the dish reflector. The collected sunlight is split into 2 parts, one being reflected into a fiber optical bundle and transmitted for daylighting, while the rest being absorbed by solar cells for electricity generation as the other way to replenish daylighting. A set of 4 solar lighting systems using 3.28‐m diameter dish are designed to meet the lighting requirement in a 1771‐m2 underground car park. A mathematical model is adopted to calculate the output power and conversion efficiency of solar cells distributed on the parabolic dish surface. The indoor illuminance distribution is given by lighting simulation. The results indicate that the average daylight illuminance in the car park can vary between 62.7 and 284 lx on February 25, 2016 and between 62.7 and 353 lx on August 17, 2016 for 2 chosen days, respectively. For the presented design, the electricity produced by solar cells is just enough to power light‐emitting diodes for lighting meeting a criterion at night. Considering about 19% conversion efficiency of solar cells and the efficacy of 129.5 lm/W of light‐emitting diodes, the hybrid solar lighting system can have about 40% utilization ratio of solar energy, so it can be concluded that a sufficient lighting provision can be provided by the proposed large dish‐type concentrator solar lighting system for applications in underground car park.

show abstract

“…Several concepts regarding daylighting systems have been demonstrated using light pipes [8][9][10][11][12] and optical fibers [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Most of the designs have issues of non-uniformity and low efficiency in terms of illuminance.…”

Section: Introductionmentioning

confidence: 99%

Development of Optical Fiber-Based Daylighting System and Its Comparison

Ullah

Whang

2015

Energies

View full text Add to dashboard Cite

Fiber-optic daylighting systems have been shown to be a promising and effective way to transmit sunlight in the interior space whilst reducing electric lighting energy consumption. To increase efficiency in terms of providing uniform illumination in the interior, the current need is to illuminate optical fiber-bundle with uniform light flux. To this end, we propose a method for achieving collimated light, which illuminates the fiber-bundle uniformly. Light is collected through a parabolic concentrator and focused toward a collimating lens, which distributes the light over each optical fiber. An optics diffusing structure is utilized at the end side of the fiber bundle to spread light in the interior. The results clearly reveal that the efficiency in terms of uniform illumination, which also reduces the heat problem for optical fibers, is improved. Furthermore, a comparison study is conducted between current and previous approaches. As a result, the proposed daylighting system turns out convenient in terms of energy saving and reduction in greenhouse gas emissions.

show abstract

Illumination performance and energy saving of a solar fiber optic lighting system

Cited by 45 publications

References 7 publications

Daylight Transport Systems for Buildings at High Latitudes

Daylight Transport Systems for Buildings at High Latitudes

Evaluation of a large dish-type concentrator solar lighting system for underground car park

Development of Optical Fiber-Based Daylighting System and Its Comparison

Contact Info

Product

Resources

About