Potential advantages of a multifunctional complex fenestration system with embedded micro-mirrors in daylighting

Gong, Junli; Kostro, André; Motamed, Ali; Schueler, Andreas

doi:10.1016/j.solener.2016.10.012

Cited by 31 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Passive solar control measures include the use anti-reflective (low-emissivity) coatings 102 and angular selective window systems that differentially reflect the sunlight depending on the incidence angle. 103,104 The traditional and most straightforward way to actively control solar gains is by external blinds and this is by far for the most implemented solution. However, external blinds are prone to wind or hail damage and their installation and maintenance cost can be substantial.…”

Section: Solar Gains and Solar Control (G-value)mentioning

confidence: 99%

Energy in buildings—Policy, materials and solutions

Koebel

Wernery

Malfait

2017

MRS Energy & Sustainability

View full text Add to dashboard Cite

Buildings account for ∼40% of global energy demands, and the increased adoption of innovative solutions for buildings represents an enormous potential to reduce energy demands and greenhouse gas emissions. Here, we critically review the current and future materials and solutions for the construction sector. We describe how policy affects innovative businesses and the adoption of new products and solutions. We investigate how the building envelope and user behavior determine building energy demands. Compared to conventional solutions, superinsulation materials (vacuum insulation panels, silica aerogel) can achieve the same thermal performance with drastically thinner insulation. With low-emissivity coatings and appropriate filler gasses, double and triple glazing reduces thermal losses by an order of magnitude. Vacuum and aerogel glazing reduce these even further. Switchable glazing solutions maximize solar gains during wintertime and minimize illumination demands whilst avoiding overheating in summer. Upon integration of renewable energy systems, buildings become both producers and consumers of energy. Combined with the dynamic user behavior, temporal variations in energy production require thermal and electrical storage and the integration of buildings into smart grids and energy district networks. The combination of these measures can reduce the energy consumption of the building's stock by a factor of three.

show abstract

Section: Solar Gains and Solar Control (G-value)mentioning

confidence: 99%

Energy in buildings—Policy, materials and solutions

Koebel

Wernery

Malfait

2017

MRS Energy & Sustainability

View full text Add to dashboard Cite

show abstract

“…The study found that the laser cut panels can uniformly distribute daylight inside the classroom, and it can potentially increase the daylight factor (DF) up to 50%. Meanwhile, the application of prismatic windows was investigated in previous studies to enhance the illumination in the deep-plan room [21], which can reach up to 40% of energy-saving [11,22].…”

Section: Introductionmentioning

confidence: 99%

Daylight Distribution Improvement Using Automated Prismatic Louvre

Eltaweel

Mandour

et al. 2020

Journal of Daylighting

View full text Add to dashboard Cite

Louvre is a common type of shading devices and has been increasingly used in office buildings. Meanwhile, some reflective types of louvre have been used to provide shade and to redirect daylight deep into buildings interior simultaneously. Furthermore, daylighting systems have been recently engaged with automation control to improve their performance and increase their accuracy. Accordingly, automation of a louvre can optimise daylighting performance, maximising visual comfort, and lighting energy saving. In order to maximise the benefits of daylight, these shading devices should be controlled efficiently using advanced control methods. On the other hand, one of the significant application in daylighting systems is the prismatic panel, which was used in several buildings to improve daylighting due to its easy installation, which also based on redirecting the light into the interior of the buildings, besides its reflective and refractive characteristic. This article presents a feasibility study on the combination of two advanced daylighting designs, i.e., prismatic panel and automated louvre, aiming to achieve simultaneous shading and redirecting daylight for better daylight distribution. In the proposed design, the louvre is comprised of prismatic slats, i.e., prismatic panel as slat. The prismatic louvre is implemented virtually based on an algorithmic system using parametric software Grasshopper, in order to control the automation process parametrically as a first step, and then the daylighting performance is simulated using Radiance as a plug-in to Grasshopper. The optical characteristics of the prismatic slats in an automated louvre is investigated. A comparison has been made in simulation between a prismatic panel and the automated louvres with reflective slats and prismatic slats, respectively, to evaluate their daylighting performance in a south-orientated virtual room in New Cairo. The simulation results are given for the conditions of clear sky on the 21st of June, 21st of September, and 21st of December.

show abstract

“…Therefore, window design needs to fulfil its nature of providing daylight and external view while keeping a balanced energy performance of the building [3]. In order to solve the problems, a multifunctional glazing based on micro compound parabolic concentrators (CPCs) is proposed [4,5]. The glazing consists of a polymer layer with a periodic array of embedded micro CPCs, and the polymer layer can be laminated to a glass pane of glazing.…”

Section: Introductionmentioning

confidence: 99%

Microfabrication of curved sidewall grooves using scanning nanosecond excimer laser ablation

Violakis

Infante

Hoffmann

et al. 2018

Laser-Based Micro- And Nanoprocessing XII

Self Cite

View full text Add to dashboard Cite

Novel glazing with embedded micro-mirrors can significantly reduce the energy consumption due to cooling and lighting in buildings. Especially promising are large arrays of periodic micro compound-parabolic-concentrators (CPCs) with angular-selected transmittance. For the production of micro CPCs, curved sidewall grooves with a controlled optical surface and an aspect ratio of about 2.3 are fabricated on polycarbonate substrates by scanning nanosecond 248-nm excimer laser ablation. The likewise obtained microstructures can be used as master mold for replication. The crosssections of the micro grooves are characterized by confocal microscopy, and the extracted morphologies are used for the ray-tracing simulation of the optical devices. Prior to the scanning ablation using a suitable mask in the optical path, the depth profiles under static ablation are investigated to identify ablation rate, imaging resolution and produced surface. Interestingly for the width of the mask opening being less than 6 μm, the ablation rate is increased due to optical interference and /or less shielding by debris. Concerning the scanning ablation, the depth of the curved sidewall grooves ranges from 48 μm to 114 μm, corresponding to the width of the groove opening being in the range from 20 μm to 50 μm. The observed final shapes in cross-sections are in good agreement with the design of the mask. For both theoretical and fabricated groove shapes, the angular-selected transmittance profiles predicted from ray-tracing simulations are highly similar. Scanning nanosecond excimer laser ablation is therefore a promising approach for the realization of highquality micro CPCs.

show abstract

Potential advantages of a multifunctional complex fenestration system with embedded micro-mirrors in daylighting

Cited by 31 publications

References 30 publications

Energy in buildings—Policy, materials and solutions

Energy in buildings—Policy, materials and solutions

Daylight Distribution Improvement Using Automated Prismatic Louvre

Microfabrication of curved sidewall grooves using scanning nanosecond excimer laser ablation

Contact Info

Product

Resources

About