Integration of sun-tracking shading panels into window system towards maximum energy saving and non-glare daylighting

Chi, Fang’ai; Wang, Ruonan; Li, Gaomei; Xu, Lingwei; Wang, Yonghe; Peng, Changhai

doi:10.1016/j.apenergy.2019.114304

Cited by 23 publications

(20 citation statements)

References 39 publications

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“…Incorporating automation control with the Venetian blinds can dramatically increase its performance as a thermal and visual comfort for occupants (Tian et al, 2014). A recent study proposed an automated shading system which can entirely track the sun movement in a three axes rotation to optimize the use of daylight and protect from glare for visual comfort (Chi et al, 2020). As a critical point of view, this system can only prevent the penetration of sunlight into the room, while the provision of natural daylight is still limited.…”

Section: Critical Discussionmentioning

confidence: 99%

Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room

Eltaweel

et al. 2020

Solar Energy

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Advanced daylighting systems have become commonly used in modern architecture for a more sustainable environment. The mainstream of recent daylighting studies focuses not only on the quantity but also the quality of daylight delivered to an interior space. The more uniform daylight is distributed in the required illuminance range, the more light stability is achieved, and the longer time is illuminated by daylight, the more electrical lighting energy can be potentially saved.This study proposes an advanced daylighting design based on a parametrically controlled louver with reflective slats to redirect sunlight onto a ceiling, which can then serve as a source of diffuse light to illuminate a room. The design aims to achieve steadier and more uniform daylight distribution during the working hours in a deep-plan office room. The angle of each slat of the louver is parametrically controlled to target a corresponding area on the ceiling. In order to achieve a steadier daylighting, a bi-axis design and a two-layer design with a shifted target are evaluated and compared with a one-axis design. A daylighting analysis of the proposed design is exemplified for a south-oriented 8m deep office room in a hot arid territory. The daylight analysis was performed using Grasshopper software as a parametric tool to link with Radiance and DAYSIM daylighting analysis. The proposed design shows promising merit that it can provide a relatively steady and *Unmarked Revised Manuscript For Publication Click here to view linked References distributed daylight coverage for more than 90% of the floor area within the recommended acceptable range 300~500 lux during the working hours.

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Section: Critical Discussionmentioning

confidence: 99%

Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room

Eltaweel

et al. 2020

Solar Energy

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“…F, Figure 44. The solar PV-T collector system [122] Chi et al proposed 1-, 2-, and 3-direction-automatic-rotation (1-DAR, 2-DAR, and 3-DAR) vertical sun-tracking shading panel arrays placed on the southern wall of the office building and concluded that the shading panel array integrated with the automatic rotation control method simultaneously prevented sun glare [123]. For the first time, Anctila et al demonstrated the net energy benefit of transparent PVs in building applications, using a life cycle approach that is thought of as a change in electricity generation and building performance [124].…”

Section: E-issn: 2148-2683 562mentioning

confidence: 99%

Cam Güneş Panelleri: Bir Derleme

Karasu

Oytaç

Ergani

et al. 2020

European Journal of Science and Technology

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The need for energy sources in the world is gradually increasing day by day. Photovoltaics (PVs) usage has worldwidely spread thanks to the efficiency and reliability increase and price decrease of solar panels. The photovoltaic (PV) glazing technique is a preferred method in modern architecture because of its aesthetic properties besides electricity generation. Traditional PV glazing systems are mostly produced from crystalline silicon solar cells (c-SiPVs). The development of low-cost PV cells for the production of costeffective and energy-saving glass systems has been of great interest. Solar control glass which is one of the crucial components of PV panels is largely employed for architectural and automotive windows to lower the sunlight and heat inlet for the comfort. Hereby a general overview of solar glass panels is presented.

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“…It is essential to improve visual and thermal performance of windows simultaneously. Previous studies assessed visual performance of office buildings [45][46][47][48][49][50], and each one used specific daylighting metrics. Karlsson and Roos [51] assessed visual performance of EC windows in a real window using experiments and used direct solar transmittance, Tsol, Tvis and angular dependence parameters to evaluate the performance of EC windows and concluded that the optimal performance of these windows was largely dependent on the application and site's location.…”

Section: Introductionmentioning

confidence: 99%

Optimal Window to Wall Ratio Ranges of Photovoltachromic Windows in High-Rise Office Buildings of Iran

Fathi

Kavoosi

2021

Journal of Daylighting

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Windows are one of the weakest building components concerning high thermal losses. Traditional windows cannot adapt to external and internal environmental conditions. On the other hand, smart windows such as electrochromic (EC) windows do not emit greenhouse gases and adapt to environmental conditions and increase indoor environmental quality. The combination of EC windows and building integrated photovoltaic system (BIPV) is called photovoltachromic (PVC) windows. This paper aims to find optimal window to wall ratio (WWR) ranges of PVC windows in a high-rise office building model in four different cities in Iran. This paper uses several simulations to find the optimal WWR ranges of PVC windows using Radiance and EnergyPlus. First, the minimum acceptable WWR value in each climate condition was identified using several simulations without any optimization tools. Afterward, traditional windows were replaced with EC windows and results indicated that energy consumption of the building reduced up to 15.94%. In the next stage, BIPV was combined with EC windows, and results indicated that BIPV reduced energy consumption of the building up to 7.55%. Finally, simulation results showed that PVC windows reduced energy consumption of the building up to 16.31% in Kermanshah, 19.69% in Tehran, 18.59% in Yazd and 17.36% in Bandar Abbas. Also, the optimal WWR range of PVC windows in Kermanshah was 80-90%, while it was 70-80% in Tehran, Yazd and Bandar Abbas. Simulation results indicated that cooling degree days (CDD) of the site, where buildings were located, effected on the optimal WWR range of PVC windows in high-rise office buildings. An analytical approach was used to validate simulation results, and it showed that simulation results had 1.60-6.22% error.

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Integration of sun-tracking shading panels into window system towards maximum energy saving and non-glare daylighting

Cited by 23 publications

References 39 publications

Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room

Advanced parametric louver systems with bi-axis and two-layer designs for an extensive daylighting coverage in a deep-plan office room

Cam Güneş Panelleri: Bir Derleme

Optimal Window to Wall Ratio Ranges of Photovoltachromic Windows in High-Rise Office Buildings of Iran

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