Spectrophotometric measurements and ray tracing simulations of mirror light pipes to evaluate the color of the transmitted light

Nilsson, Annica M.; Jonsson, Jacob C.; Roos, Arne

doi:10.1016/j.solmat.2014.01.049

Cited by 9 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is generally assumed that spectral variations generated by reflective light pipes do not affect the color of the transmitted daylight. In 2014, Nilsson et al [10] confirmed this assumption. To do so, they use a numerical approach and spectrophotometric measurements (controlled environment) to qualify the illuminances (direct/diffuse) entering inside the pipe, neglecting the presence of the collection and diffusion device.…”

Section: A Short Review On Thermal and Spectral Light Pipe Investigat...mentioning

confidence: 94%

Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment

Malet-Damour¹,

Fakra²

2021

International Journal of Sustainable Energy

View full text Add to dashboard Cite

Light holds an important place in the way of life of humans. The first type of lighting which could be exploited was daylight. Tubular Daylight Guidance Systems (TDGS) transport and distribute this daylight inside a building. This article focuses on one of the best known: the Mirrored Light Pipe. MLPs are multiple specular reflectance transporters. This paper presents (i) state of the art on thermal and spectral studies on light pipes from 1998 to 2021 and (ii) proposes an experimental analysis on MLP in the climatic environment with a high solar resource for different spectral bands of the daylight spectrum. The results show that the thermal impact of the light pipe is limited. Moreover, it is demonstrated that this device promotes natural circadian rhythms. A comparison with artificial lighting highlights this device as an ideal solution for bioclimatic building design.

show abstract

Section: A Short Review On Thermal and Spectral Light Pipe Investigat...mentioning

confidence: 94%

Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment

Malet-Damour¹,

Fakra²

2021

International Journal of Sustainable Energy

View full text Add to dashboard Cite

show abstract

“…The vacuum metallization is the physical vapor deposition process (PVD) that consists of the transformation of the material being deposited in a vapor in a vacuum chamber and transporting to the material of the part to be deposited (substrate) and activated by a plasma [29]. The PVD, among its advantages, has the ability to deposit coatings of various types on substrates of any material, allowing the metallization of parts with simple or complex geometries, in addition to presenting a low degree of aggressiveness to the environment [31]. The vacuum metallization processes differ by the type of energy they use, and can be by ionizing, planting in this case the heat that promotes the evaporation of the material, by sputtering, which is the bombardment between gas ions (usually argon) and the atoms that constitute the target substrate [29].…”

Section: Methodsmentioning

confidence: 99%

“…It is also noted that, in regions of ultraviolet and infrared light, there is a drastic fall in the capacity of reflection, which is characterized by the use of aluminum in the structure of the tube dissipating part of the heat without itself and Analyzing the data, it was verified that the lowest reflection peak of the visible region of this sample is 62.44% in the wavelength 380 nm, the highest peak is 93.76% in the wavelength 744 nm and arithmetic mean of the reflection in this region was 91.15%. It is also noted that, in regions of ultraviolet and infrared light, there is a drastic fall in the capacity of reflection, which is characterized by the use of aluminum in the structure of the tube dissipating part of the heat without itself and avoiding a drive to the environment [31]. Figure 3 shows the results of the tests on the ABS test bodies.…”

Section: Methodsmentioning

confidence: 99%

Proposal of the Tubular Daylight System Using Acrylonitrile Butadiene Styrene (ABS) Metalized with Aluminum for Reflective Tube Structure

Spacek¹,

Neto²,

Bilessimo³

et al. 2018

Energies

View full text Add to dashboard Cite

Abstract:In the search for alternatives to reduce the consumption of electric energy, the possibility of using natural light for lighting through TDD (tubular daylight devices) or TDGS (tubular daylight guidance systems) appears. These natural luminaires are used in rooms where you want to save electricity and enjoy the benefits of natural light. The present work proposes the construction of a tubular system for the conduction of natural light that replaces aluminum with silver (currently marketed by several companies) by polymer metallized with aluminum, offering a low cost. The polymer acrylonitrile butadiene styrene (ABS), coated with aluminum by physical vapor deposition (ionization), was evaluated for some tests to verify characteristics of the structure and the metallized surface. After the tests, the construction of the reflective tube was performed and validated in a real scale of application. The results proved the technical viability of the proposed tube construction for the realization of direct sunlight for illumination using polymeric material. Although it has produced 35% less than the reference tube, it can be marketed at an estimated cost of 50% less.

show abstract

“…14 and 15. Those elements have a role to provide effective internal light reflection and are coated with highly reflective materials like silver, aluminum or 3M [78] and dielectric [79] films, which approach reflection of 99%. Light transmittance (efficiency) of the pipe depends on its Diameter to Length ratio called aspect ratio.…”

Section: Light Reflection Guide-pipesmentioning

confidence: 99%

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

Spectrophotometric measurements and ray tracing simulations of mirror light pipes to evaluate the color of the transmitted light

Cited by 9 publications

References 13 publications

Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment

Thermal and spectral impact of building integrated Mirrored Light Pipe to human circadian rhythms and thermal environment

Proposal of the Tubular Daylight System Using Acrylonitrile Butadiene Styrene (ABS) Metalized with Aluminum for Reflective Tube Structure

Daylight Transport Systems for Buildings at High Latitudes

Contact Info

Product

Resources

About