A sensor-less LED dimming system based on daylight harvesting with BIPV systems

Yoo, Seung‐Hwan; Kim, Jonghun; Jang, Cheol-Yong; Jeong, Hakgeun

doi:10.1364/oe.22.00a132

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…The proposed method achieved on average 10% less power savings compared with the cases where the light sensors were located at the workspace plane [18]. Yoo et al (2014) evaluated the LED light energy savings of a DRDS in an office by using light simulation software. The lighting energy savings ranged from 40% to 70% [19].…”

Section: State Of the Artmentioning

confidence: 99%

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High-Performance Accuracy of Daylight-Responsive Dimming Systems with Illuminance by Distant Luminaires for Energy-Saving Buildings

Kim

Cho

et al. 2019

Energies

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In a conventional daylight-responsive dimming system (DRDS), all the luminaires are turned off during the calibration process except for the luminaire under consideration in order to sense only the workplane illuminance of that luminaire. However, the workplane illuminance of the luminaire is influenced by other luminaires. Therefore, the final workplane illuminance of the actual operated system is higher than the target workplane illuminance, reducing the energy-saving efficiency of the DRDS. Herein, to improve the conventional DRDS, an advanced commissioning prediction method of daylight illuminance, and a dimming control algorithm considering the influences by distant luminaires are proposed. To evaluate the accuracy of the proposed prediction method of daylight illuminance, the daylight illuminance on the workplane and the photo sensor values of six points were measured in a full-scale mockup for 27 consecutive days from 22 June to 18 July 2018. As a result of root-mean-square error (RMSE) analysis of daylight illuminance and the photo sensor values, the RMSE (64.86) of P3 located in the middle of the room was the highest, and the RMSE value (17.60) of P5 located near the window was the lowest. In addition, the power consumption of the luminaires, and the target illuminance accuracy of the proposed DRDS were measured and analyzed for 32 consecutive days from 19 July to 19 August 2018 in a full-scale mockup. The average target illuminance accuracy was 96.9% (SD 2.2%), the average lighting energy-savings ratio was 78.4%, and the daylight illuminance prediction accuracy was 95.5% (SD 3.4%).

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Section: State Of the Artmentioning

confidence: 99%

“…Yoo et al (2014) evaluated the LED light energy savings of a DRDS in an office by using light simulation software. The lighting energy savings ranged from 40% to 70% [19]. Gentile and Dubois (2017) investigated the effectiveness of lighting control systems in an office by using simulations based on actual occupancy data.…”

Section: State Of the Artmentioning

confidence: 99%

High-Performance Accuracy of Daylight-Responsive Dimming Systems with Illuminance by Distant Luminaires for Energy-Saving Buildings

Kim

Cho

et al. 2019

Energies

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“…The proposed method achieved 10% less power savings on average than when the light sensors were located at the workspace plane [12]. Yoo et al (2014) calculated the distribution of daylight illumination into an office, as well as the dimming ratios for individual control of LED lights using light simulation software. As a result, the power consumption of electrical lighting was reduced by 40-70% depending on the season and weather conditions [13].…”

Section: Previous Researchmentioning

confidence: 99%

“…Yoo et al (2014) calculated the distribution of daylight illumination into an office, as well as the dimming ratios for individual control of LED lights using light simulation software. As a result, the power consumption of electrical lighting was reduced by 40-70% depending on the season and weather conditions [13]. Gentile and Dubois (2017) investigated the effectiveness of lighting control systems in office rooms located in Lund, Sweden.…”

Section: Previous Researchmentioning

confidence: 99%

Advanced Dimming Control Algorithm for Sustainable Buildings by Daylight Responsive Dimming System

Kim

Nam

2018

Sustainability

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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%.

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“…In particular, in order to reduce indoor lighting energy use, which accounts for nearly 30% of the total energy use in buildings, high-efficiency LED lighting and daylight dimming control technologies have been developed [4][5][6]. High-efficiency LEDs convert nearly 15%-25% of electric power to visible light, while the rest is transformed into heat.…”

Section: Introductionmentioning

confidence: 99%

Savings in Cooling Energy with a Thermal Management System for LED Lighting in Office Buildings

et al. 2015

Self Cite

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Light-emitting diode (LED) lighting should be considered for lighting efficiency enhancement, however, waste heat from light-emitting diode (LED) lighting increases the internal cooling load during the summer season. In order to solve this problem we propose a thermal management system for light-emitting diode (LED) lighting with a heat exchanger module integrated with the building's heating, ventilation, and air conditioning (HVAC) system to move the lighting's waste heat outdoors. An experiment was carried out to investigate the thermal effects in a test chamber and the heat exchange rate between the heat sink and the duct air. The heat generated by the light-emitting diode (LED) lighting was calculated as 78.1% of light-emitting diode (LED) input power and the heat exchange rate of the lighting heat exchange module was estimated to be between 86.5% and 98.1% according to the light-emitting diode (LED) input power and the flow rate of air passing the heat sink. As a result, the average light-emitting diode (LED) lighting heat contribution rate for internal heat gain was determined as 0.05; this value was used to calculate the heating and cooling energy demand of the office building through an energy simulation program. In the simulation results, the cooling energy demand was reduced by 19.2% compared with the case of conventionally installed light-emitting diode (LED) lighting. OPEN ACCESSEnergies 2015, 8 6659

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A sensor-less LED dimming system based on daylight harvesting with BIPV systems

Cited by 20 publications

References 24 publications

High-Performance Accuracy of Daylight-Responsive Dimming Systems with Illuminance by Distant Luminaires for Energy-Saving Buildings

High-Performance Accuracy of Daylight-Responsive Dimming Systems with Illuminance by Distant Luminaires for Energy-Saving Buildings

Advanced Dimming Control Algorithm for Sustainable Buildings by Daylight Responsive Dimming System

Savings in Cooling Energy with a Thermal Management System for LED Lighting in Office Buildings

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