Abstract
This study aims to evaluate the accuracy and energy savings of a daylight responsive dimming system (DRDS) when considering the influence of indirect illuminance. In the case of the existing DRDS, during the calibration process of each luminaire, the other luminaires were turned off to detect the illuminance of both the luminaire and the incoming daylight. However, the work plane illuminance under the luminaires was affected by the indirect illuminance from the other luminaires. The final work plane illuminance would thus be higher than the target illuminance during real system operation. To improve the accuracy and energy savings of the DRDS, an improved dimming control algorithm was applied to the DRDS when considering the influence of indirect illuminance. The real-time power consumption and accuracy of the target illuminance of the DRDS when considering the influence of indirect illuminance in a full-scale mock-up was measured and analyzed (for 23 days, from 22 June to 18 July 2018). As a result, the average accuracy of the target illuminance was 98.9% (SD 0.5%), and the average saving in lighting energy was 77%.
Highlights
In the field of architecture, which accounts for 25% of the total greenhouse gas emissions in the Republic of Korea, for example, a zero-energy building activation policy is being implemented to reduce the energy consumption of buildings by more than 90% when combining energy consumption and production [1]
This study developed a dimming control algorithm considering indirect illuminance; the dimming control algorithm of this study can be applied to the daylight responsive dimming system (DRDS), whereas the dimming control algorithm of our study cannot be applied to the DRDS [20]
Indirect illuminance learning was performed on the full-scale test-bed
Summary
The Republic of Korea has announced its greenhouse gas emissions reduction goals. To fulfill these goals, research and development has been actively carried out to reduce the greenhouse gas emissions and energy consumption in each field. In the field of architecture, which accounts for 25% of the total greenhouse gas emissions in the Republic of Korea, for example, a zero-energy building activation policy is being implemented to reduce the energy consumption of buildings by more than 90% when combining energy consumption and production [1]. To reduce the energy consumption of a lighting installation, LED luminaires with the advantages of high efficiency and a long life are used. To further reduce the energy consumption of the lighting, a DRDS that utilizes daylight incident to an indoor area is typically used
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