Performance evaluation of a top lighting light-pipe in buildings and estimating energy saving potential

Sharma, Lakshya; Ali, Sana Fatima; Rakshit, Dibakar

doi:10.1016/j.enbuild.2018.09.022

Cited by 41 publications

(24 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to attain more effective use of dynamic daylight, stable optical components and active devices of the daylighting system were studied. Common optical components are high-reflectivity light pipes [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], Fresnel lens [32][33][34][35][36][37][38][39][40][41][42][43][44], linear Fresnel lens [45][46][47], optical fiber with different materials [32], light guide [39], parabolic concentrator [48][49][50], Compound Parabolic Concentrator (CPC) [38,47,51,52], dish concentrator [1,53], cold mirror [48], IR filer [32,38], hot mirror [49] and prism structure ...…”

Section: Of 34mentioning

confidence: 99%

“…Melatonin inhibits secretion [65] Excessive UV-B can cause erythema or DNA damage [71] Reduce the risk of cardiovascular disease [7,8,68,72] UVA-1 induces pigmentation of IV-VI type Improve psychological problems such as depression and seasonal mood [6,48,73,74] Uncomfortable glare problem [2,75] Reduce the risk of colorectal cancer [69] Excessive heat will cause an increase indoor electrical energy consumption [16] Reduce the incidence of diabetes [72] 2.…”

Section: The Benefits Of Daylight the Disadvantages Of Daylightmentioning

confidence: 99%

See 1 more Smart Citation

A Review of Daylighting System: For Prototype Systems Performance and Development

et al. 2019

View full text Add to dashboard Cite

Daylighting systems make daylight illuminance possible, and the development of prototype daylighting systems can provide more efficient daylight illuminance. The purpose of this article is to review the development and performance of prototype daylighting systems in the last decade. The passive and active daylighting systems are listed separately and divided into the four categories by the presence and absence of hybrid. Each prototype daylighting system was evaluated in terms of cost and daylight performance and as well as their novel optical design. We evaluated the architecture and daylighting principles of each system by reviewing individual prototype daylighting systems. The cost of prototype systems still poses a challenge to development. How to use passive or active systems in different environments and whether or not electrical lighting assistance is needed is a controversial issue. However, active daylighting systems equipped with solar tracking systems are still mainstream. This research is a valuable resource for daylight researchers and newcomers. It is helpful to understand the advantages of various prototype daylighting systems and commercial daylighting systems that have been developed for many years; moreover, it is also possible to know the research directions suggested by the prototype daylighting systems. These will be of further use in developing innovative and better daylighting systems and designs.

show abstract

Section: Of 34mentioning

confidence: 99%

Section: The Benefits Of Daylight the Disadvantages Of Daylightmentioning

confidence: 99%

A Review of Daylighting System: For Prototype Systems Performance and Development

et al. 2019

View full text Add to dashboard Cite

show abstract

“…They can be applied in residential, commercial [21], school buildings [22], offices [23], and industrial buildings [24]. The advantages of light pipes are the exploitation of solar gains in the winter, the protection against glare, the possibility of bringing daylight into environments without windows, the uniform distribution of daylight, the increasing of the overall availability of daylight, the absence of the chromatic alteration of daylight, the possibility of applying, even in existing buildings, energy savings on artificial light, the improvement of visibility in relation to the best quality of light (sunlight), and the well-being of the occupants [25]. The disadvantages are the non-constant behavior of collection systems during the year, the reduced availability of daylight (in case of a partially covered sky), the lack of visual contact with the outside, and the higher costs.…”

Section: An Overview On Light Pipesmentioning

confidence: 99%

Modeling of Light Pipes for the Optimal Disposition in Buildings

2019

View full text Add to dashboard Cite

A light pipe is an excellent solution to transport and distribute daylight into environments without or with little lighting, guaranteeing comfort inside the rooms. As stated in the literature, the evaluation of the performances of light pipes presents numerous complexities, making the work very difficult for technicians and designers. This study is aimed to present a methodology that is able to identify the potential of light pipes using indices such as daylight autonomy (DA), continuous daylight autonomy (DAc), and useful daylight illuminance (UDI). This paper presents an analysis of daylight obtained by several configurations of simple models of light pipes installed into a 5 × 5 m plant area room. All simulations are carried out in a DAYSIM environment, which allows calculating the annual availability of daylight based on a RADIANCE raytracer backward. Several daylight conditions were analyzed for different light pipe configurations, considering different pipe lengths and a variable number of light pipes. The light pipes are tested also in the horizontal position, for different orientations. The results of all the combinations were compared with the performances of a window with dimensions equal to 1/8 of the internal surface, which was in accordance with the minimum value to be guaranteed by the Italian Regulation (D.M. 5 July 1975 n. 190) for different orientations. The results indicated a difference in daylight distribution, showing a strong correlation between the percentage levels of DA and DAc with the length and number of pipes, during different periods of the year. The simulated model is strongly influenced by the aspect ratio (R = diameter/length). The results show that the illuminance levels decrease drastically, increasing the length.

show abstract

“…For the raytracing simulation, 0.2 million rays were set as the input parameter. The light transmission efficiency of the light pipe can be calculated as [18]…”

Section: Simulationmentioning

confidence: 99%

“…Electric lighting energy was reduced in farm animal production using daylight transmission through light pipe [16,17]. Light pipe designs gave better results with a tilt angle of 6 degree, which was achieved through simulation [18]. HOLIGILM tools was used to check performance of different light pipes in different climate zones [19].…”

Section: Introductionmentioning

confidence: 99%

Heliostats Daylighting System for Multi-floor Buildings

Ullah

2019

Journal of Daylighting

View full text Add to dashboard Cite

Daylighting has been considered as a major part of sustainable buildings for saving electric lighting and providing benefits such as, health, visual comfort, and productivity of the occupants. A daylighting system enables the sunlight to capture and deliver it in the interior spaces that cannot be illuminated through windows. Previously, small-scale daylighting systems have been presented using active and passive techniques. This paper presents a daylighting scheme to illuminate the interior of a multi-floor building. Traditional light pipe-based systems are lacked to achieve a high concentration of sunlight for illuminating the interior of a multi-floor building. Here, a highly concentrated light pipe-based daylighting system is presented using heliostats. The daylighting system includes heliostats, light pipe, and light guide to collect, transmit, and distribute the light in the interior of the multi-floor building, respectively. The light guide is made of a reflective film and a prismatic optical film for distributing the light in the interior. Heliostats track the sun and reflect the light towards a circular flat mirror, which inserts the light into the light pipe. To transmit a portion of the light into the light guide for illuminating the interior of each floor, a redirecting mirror is placed at the inlet of the light guide inside the light pipe. Simulation results have shown that an efficiency of 40% is achieved providing almost uniform illumination in the interior.

show abstract

Performance evaluation of a top lighting light-pipe in buildings and estimating energy saving potential

Cited by 41 publications

References 10 publications

A Review of Daylighting System: For Prototype Systems Performance and Development

A Review of Daylighting System: For Prototype Systems Performance and Development

Modeling of Light Pipes for the Optimal Disposition in Buildings

Heliostats Daylighting System for Multi-floor Buildings

Contact Info

Product

Resources

About