Energy saving claims for lighting controls in commercial buildings

Lowry, Gordon

doi:10.1016/j.enbuild.2016.10.003

Cited by 57 publications

(35 citation statements)

References 34 publications

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“…Hence, there is a high variation between different buildings and comparisons should be taken with care. Consequently, electric energy savings for lighting determined via measurements or calculation show a very large range of variation between 11% and 94% [11]. Some correlations try to cover all relevant influences and offer methods to estimate energy savings (e.g., Krarti et al [12] and Ihm et al [13]).…”

Section: Lighting Systems and Conservationsmentioning

confidence: 99%

“…Some correlations try to cover all relevant influences and offer methods to estimate energy savings (e.g., Krarti et al [12] and Ihm et al [13]). Lowry [11] criticized that savings caused by automatic controls are overestimated in many cases because of choosing a non-adequate reference scenario with an insufficient user behaviour profile for manual on/off control. He also suggested as a key performance indicator to focus on absolute energy metrics instead of percentage savings.…”

Section: Lighting Systems and Conservationsmentioning

confidence: 99%

“…1-7) and 700 lx (Nos. [8][9][10][11][12][13][14]. As a step in between, two 500 lx variants were also calculated (Nos.…”

Section: D Modelmentioning

confidence: 99%

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Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

et al. 2018

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Daylight usage in buildings improves visual comfort and lowers the final energy demand for artificial lighting. The question that always occurs is how much conservation can be achieved? New or rare materials and constructions have a lack of information about their application. Therefore, the current investigation quantifies the daylight and energy performance of a rare multi-layer textile membrane roof. A translucent, thermal insulation with a glass fibre fleece between the two roof membranes combines daylight usage and heating demand reduction. A sports hall built in 2017 is used as a case study building with 2300 m 2 membrane roof surface. The optical properties of the roof construction were measured with a total visual light transmittance τ v of 0.72% for a clean surface. A climate-based annual daylight modelling delivers daylight indicators for different construction scenarios. The results show that, in comparison to only one glass façade, the additional translucent and thermally insulated membrane roof construction increases the annual daylight autonomy (DA 700 ) from 0% to 1.5% and the continuous DA 700 from 15% to 38%. In the roof-covered areas of the sport field, this results in a 30% reduction of the electricity demand for artificial lighting from 19.7 kWh el /m 2 /a to 13.8 kWh el /m 2 /a, when a dimming control is used. The study also found that the influence of the soiling of one layer decreases its light transmittance by a factor 0.81. Two soiled layers lower τ v by a factor of 0.66 to 0.47%. This increases the electricity demand for lighting by only 12%. The results should be very valuable as a comparison and benchmark for planners and future buildings of a similar type.

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Section: Lighting Systems and Conservationsmentioning

confidence: 99%

Section: Lighting Systems and Conservationsmentioning

confidence: 99%

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Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

et al. 2018

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“…Advanced optical daylighting systems: light shelves and light pipes [21] 1997 Fixed at a certain value Not considered e development of coefficients of utilization for light shelves [22] 1993 Fixed at a certain value Not considered 4 Advances in Civil Engineering indoor illumination distribution depending on the installation of the light shelf. e illumination sensor was installed at 1.1 m intervals based on the size of the space.…”

Section: Performance Evaluation Environment Settingmentioning

confidence: 99%

“…erefore, an increasing number of studies are focusing on the use of light shelves to reduce the lighting energy consumption of buildings [1][2][3][4][5]. A light shelf is a daylighting system installed on windows, which introduces external natural light into the interiors of a building.…”

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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Reduzierung des Kunstlichteinsatzes durch Anpassung der Nachlaufzeit an individuelle Anwesenheitsmuster

et al. 2021

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Gegenwärtig sind präsenzgesteuerte Beleuchtungssysteme meist an konstante und relativ lange Ausschaltverzögerungen gekoppelt, um die Systemakzeptanz gegenüber fehlerhafter Abwesenheitsdetektion sicherzustellen. Die dabei zur Anwendung kommenden, generalisierten und für alle Arbeitsplätze und Gebäudenutzenden gleichen Abschaltzeiten werden meist bereits vor der Erstinbetriebnahme entschieden. Eine Berücksichtigung von Nutzerindividualitäten, welche durch Tätigkeitsprofil und Unternehmenskultur maßgeblich beeinflusst werden, bleibt dabei außen vor. Dabei nehmen Nutzerindividualitäten eine entscheidende Rolle bei der Umsetzung von Konzepten ein, die die energetische Systemperformanz steigern. Die im Folgenden vorgestellte Studie untersucht daher auf Basis von Belegungsdaten die Auswirkungen des Verhaltens von Gebäudenutzenden auf den Energiebedarf. Die identifizierten Anwesenheitsmuster dienen dazu, die Beleuchtungssteuerung auf individueller Ebene zuzuschneiden. Die Ergebnisse führen auf, dass eine signifikante Reduktion der Ausschaltverzögerung und des damit verbundenen Energiebedarfs ohne negative Auswirkungen auf Systemakzeptanzraten oder Nutzerkomfort möglich ist. Eine hohe räumliche Sensorauflösung erweist sich dabei jedoch als Ausgleich zu potenziell erhöhten Falsch‐Aus‐Raten als erforderlich. In diesem Zusammenhang wird die Bedeutung der Sensorpositionierung und ‐anzahl herausgestellt.

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Energy saving claims for lighting controls in commercial buildings

Cited by 57 publications

References 34 publications

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

Daylight Performance of a Translucent Textile Membrane Roof with Thermal Insulation

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

Reduzierung des Kunstlichteinsatzes durch Anpassung der Nachlaufzeit an individuelle Anwesenheitsmuster

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