Effectiveness of a perforated light shelf for energy saving

Lee, Heangwoo; Kim, Kyung-Soo; Seo, Janghoo; Kim, Yong-Seong

doi:10.1016/j.enbuild.2017.03.008

Cited by 39 publications

(27 citation statements)

References 10 publications

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“…Through this study, the relationship between the indoor thermal environment and the PCM's thickness, placement, and orientation was analyzed [61] Second, the past studies related to the trombe wall, which functions as a heat storage system by applying a solar heating collector made of double glazing on the wall, are as follows [62][63][64][65][66] The results showed that the trombe wall increased the cooling demand in summer, but it is very suitable for the Belgrade climate because of its efficient heating energy-saving in winter [66]. (3) Lighting design: From the perspective of nZEB implementation, this study analyzed the previous studies focused on the lighting emitting diode (LED), light shelves, and lighting control system as methods for reducing the lighting load (refer to Table 6) [67][68][69][70][71][72][73][74]. Principi and Fioretti (2014) conducted a comparative analysis of the compact fluorescent and LED in terms of their environmental performance, based on the experimental test results.…”

Section: Part A-1: Passive Sustainable Designmentioning

confidence: 99%

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

Hong

Kim

et al. 2017

Sustainability

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Abstract:To cope with 'Post-2020', each country set its national greenhouse gas (GHG) emissions reduction target (e.g., South Korea: 37%) below its business-as-usual level by 2030. Toward this end, it is necessary to implement the net-zero energy building (nZEB) in the building sector, which accounts for more than 25% of the national GHG emissions and has a great potential to reduce GHG emissions. In this context, this study conducted a state-of-the-art review of nZEB implementation strategies in terms of passive strategies (i.e., passive sustainable design and energy-saving technique) and active strategies (i.e., renewable energy (RE) and back-up system for RE). Additionally, this study proposed the following advanced strategies for nZEB implementation according to a building's life cycle: (i) integration and optimization of the passive and active strategies in the early phase of a building's life cycle; (ii) real-time monitoring of the energy performance during the usage phase of a building's life cycle. It is expected that this study can help researchers, practitioners, and policymakers understand the overall implementation strategies for realizing nZEB.

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Section: Part A-1: Passive Sustainable Designmentioning

confidence: 99%

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

Hong

Kim

et al. 2017

Sustainability

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“…Follow up studies were presented, further developing the aforesaid prototypes to improve daylighting performance at more oblique solar angles to the window [58,59]. Lee et al [60] proposed perforated light shelves aiming at minimizing the effect of wind pressure when they are installed in high rise buildings. An actual-scale testbed was used to evaluate the performance in terms of lighting energy savings.…”

Section: Performance Analysis Of Curved Light Shelvesmentioning

confidence: 99%

“…In the deepest part of the room, the increase in daylight factors was 1.4 times the value of the reference case when there was no external obstruction and 1.7 when an urban environment was simulated. Lee et al [60] proposed perforated light shelves aiming at minimizing the effect of wind pressure when they are installed in high rise buildings. An actual-scale testbed was used to evaluate the performance in terms of lighting energy savings.…”

Section: Performance Analysis Of Curved Light Shelvesmentioning

confidence: 99%

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A Review of Light Shelf Designs for Daylit Environments

et al. 2017

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Light shelves have been discussed in numerous studies as suitable solutions for controlling daylight in side-lit spaces. It is a system that can be easily modified, offering a range of design solutions. It can be easily mounted on the exterior and/or the interior of a vertical opening, it can come in various shapes from static flat forms to curved reflective surfaces, or it can even be actively controlled. A light shelf can offer shading and at the same time can redirect a significant part of the incoming light flux towards the ceiling improving daylight uniformity. Due to the aforesaid functions, light shelves are among the most popular system design solutions when it comes to daylight exploitation. The purpose of this paper is twofold. Firstly, to present the main research findings in relation to light shelves as daylighting systems and secondly to analyze the results, trying to establish a common basis for some efficient and practical design rules. The present paper is a review of the research realized in the last three decades concerning these systems together with their associated implications in a building's daylight performance as well as in its energy balance in a few cases. In addition, the critical review of their design principles is included, which makes the presented information useful for design teams trying to select the optimal available system for any specific project.

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“…In addition, an external light shelf has outstanding daylight performance [6], but it is an external projection (i.e., a device attached to the outside of a building). us, the light shelf can be damaged by strong winds when used in high-rise buildings [8]. In winters, the light shelf may cause [9] an increase in the consumption of heating energy by blocking incoming solar radiation from the outside.…”

Section: Introductionmentioning

confidence: 99%

Development and Performance Evaluation of Light Shelves Using Width-Adjustable Reflectors

Lee

Park

Seo

2018

Advances in Civil Engineering

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In recent years, there has been an increase in the consumption of energy for lighting purposes, which has led to an increase in the number of studies being conducted on this subject. Most studies have focused on light shelves, which are daylighting systems used for reducing the lighting energy required for the interiors of buildings. However, the existing light shelves cannot actively deal with external environmental factors, which often lead to an infringement of the right to light during the night when the performance of the light shelf deteriorates. erefore, in this study, we propose a light shelf with a width-adjustable reflector and verify its validity using a testbed. e reflector of the proposed light shelf system is modularized so that the length can be adjusted in stages. e optimum width of the light shelf is calculated in terms of the energy reduction and uniformity ratio improvement, and the obtained optimum width is varied depending on the season. We find that the width-adjustable reflector can save 20% and 21.6% more lighting energy than light shelves with fixed reflector widths of 0.3 m and 0.6 m, respectively.

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Effectiveness of a perforated light shelf for energy saving

Cited by 39 publications

References 10 publications

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle

A Review of Light Shelf Designs for Daylit Environments

Development and Performance Evaluation of Light Shelves Using Width-Adjustable Reflectors

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