Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System

A daylighting control system that uses the closed loop proportional algorithm needs to be calibrated both during nighttime and daytime. The selection of the daytime calibration time can affect the behavior of the system and is usually performed when the ratio of the illuminance of the ceiling sensor...

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Autores principales:	Aris Tsangrassoulis, Lambros Doulos, Angelos Mylonas
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	artificial lighting daylight harvesting energy efficiency energy savings lighting control photo-sensors Technology T
Acceso en línea:	https://doaj.org/article/5ca8311cd4fd4abab6ae2ef752b92d9c
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spelling	oai:doaj.org-article:5ca8311cd4fd4abab6ae2ef752b92d9c2021-11-11T15:51:58ZSimulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System10.3390/en142170561996-1073https://doaj.org/article/5ca8311cd4fd4abab6ae2ef752b92d9c2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7056https://doaj.org/toc/1996-1073A daylighting control system that uses the closed loop proportional algorithm needs to be calibrated both during nighttime and daytime. The selection of the daytime calibration time can affect the behavior of the system and is usually performed when the ratio of the illuminance of the ceiling sensor (<i>S<sub>D</sub></i><sub>,<i>tc</i></sub>) to the illuminance at a point on the working plane (<i>E<sub>D</sub></i><sub>,<i>tc</i></sub>) is relatively large without sunlight patches in the ceiling photo-sensor’s field of view (FOV). However, this requirement is not associated with a specific value and can be achieved under a wide range of conditions related to the sky luminance distribution. In the present work, four ceiling sensors with different field of views (FOVs) were examined in a typical north-facing office space. The effect of daytime calibration on the system’s performance was estimated through the calculation of lighting energy savings and the overdimming percentage. The results show that the effect of both the FOV of the ceiling sensor and the daytime calibration period is small except for the case of the sensor without cover, especially when it is close to the opening. In an attempt to quantify the <i>S<sub>Dtc</sub></i>/<i>I<sub>Dtc</sub></i> ratio, a new magnitude (<i>RR</i>) is proposed by dividing the illuminance ratios of the ceiling photo-sensor by that on the working surface during daytime and nighttime calibration. Thus, the daily calibration of the sensors with cover can be performed when <i>RR</i> > 1.Aris TsangrassoulisLambros DoulosAngelos MylonasMDPI AGarticleartificial lightingdaylight harvestingenergy efficiencyenergy savingslighting controlphoto-sensorsTechnologyTENEnergies, Vol 14, Iss 7056, p 7056 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	artificial lighting daylight harvesting energy efficiency energy savings lighting control photo-sensors Technology T
spellingShingle	artificial lighting daylight harvesting energy efficiency energy savings lighting control photo-sensors Technology T Aris Tsangrassoulis Lambros Doulos Angelos Mylonas Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
description	A daylighting control system that uses the closed loop proportional algorithm needs to be calibrated both during nighttime and daytime. The selection of the daytime calibration time can affect the behavior of the system and is usually performed when the ratio of the illuminance of the ceiling sensor (<i>S<sub>D</sub></i><sub>,<i>tc</i></sub>) to the illuminance at a point on the working plane (<i>E<sub>D</sub></i><sub>,<i>tc</i></sub>) is relatively large without sunlight patches in the ceiling photo-sensor’s field of view (FOV). However, this requirement is not associated with a specific value and can be achieved under a wide range of conditions related to the sky luminance distribution. In the present work, four ceiling sensors with different field of views (FOVs) were examined in a typical north-facing office space. The effect of daytime calibration on the system’s performance was estimated through the calculation of lighting energy savings and the overdimming percentage. The results show that the effect of both the FOV of the ceiling sensor and the daytime calibration period is small except for the case of the sensor without cover, especially when it is close to the opening. In an attempt to quantify the <i>S<sub>Dtc</sub></i>/<i>I<sub>Dtc</sub></i> ratio, a new magnitude (<i>RR</i>) is proposed by dividing the illuminance ratios of the ceiling photo-sensor by that on the working surface during daytime and nighttime calibration. Thus, the daily calibration of the sensors with cover can be performed when <i>RR</i> > 1.
format	article
author	Aris Tsangrassoulis Lambros Doulos Angelos Mylonas
author_facet	Aris Tsangrassoulis Lambros Doulos Angelos Mylonas
author_sort	Aris Tsangrassoulis
title	Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
title_short	Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
title_full	Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
title_fullStr	Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
title_full_unstemmed	Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System
title_sort	simulating the impact of daytime calibration in the behavior of a closed loop proportional lighting control system
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5ca8311cd4fd4abab6ae2ef752b92d9c
work_keys_str_mv	AT aristsangrassoulis simulatingtheimpactofdaytimecalibrationinthebehaviorofaclosedloopproportionallightingcontrolsystem AT lambrosdoulos simulatingtheimpactofdaytimecalibrationinthebehaviorofaclosedloopproportionallightingcontrolsystem AT angelosmylonas simulatingtheimpactofdaytimecalibrationinthebehaviorofaclosedloopproportionallightingcontrolsystem
_version_	1718433303031185408

Simulating the Impact of Daytime Calibration in the Behavior of a Closed Loop Proportional Lighting Control System

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