Quantifying energy savings in daylight responsive systems: The role of dimming electronic ballasts

Doulos, L; Tsangrassoulis, A; Topalis, F

dc.contributor.author	Doulos, L	en
dc.contributor.author	Tsangrassoulis, A	en
dc.contributor.author	Topalis, F	en
dc.date.accessioned	2014-03-01T01:29:04Z
dc.date.available	2014-03-01T01:29:04Z
dc.date.issued	2008	en
dc.identifier.issn	0378-7788	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19108
dc.subject	Daylight	en
dc.subject	Dimmable electronic ballast	en
dc.subject	Energy savings	en
dc.subject	Photosensor	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Algorithms	en
dc.subject.other	Ballasts (lamp)	en
dc.subject.other	Dimming (lamps)	en
dc.subject.other	Electric power utilization	en
dc.subject.other	Optical sensors	en
dc.subject.other	Daylight	en
dc.subject.other	Dimmable electronic ballast	en
dc.subject.other	Lighting control systems	en
dc.subject.other	Photosensors	en
dc.subject.other	Energy conservation	en
dc.title	Quantifying energy savings in daylight responsive systems: The role of dimming electronic ballasts	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enbuild.2007.01.019	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enbuild.2007.01.019	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	The application of lighting control technologies with photosensors has led to an increase in public interest. Although these technologies have been promoted during the last years their successful use in buildings has been accomplished in a small percentage of new projects. One reason is the difficulty in quantifying the energy savings and thus the subsequent payback period. Daylight responsive dimming systems consist of three basic components: photosensor, controller, and dimming unit. Electronic dimming ballast (EDB) is one substantial component of these lighting control systems which can adjust the light output due to the transferred signal from the photosensor and lighting controller. The aim of this study is to quantify energy savings among different EDBs. Eighteen commercial EDBs were selected and various sets of electrical and illuminance measurements were taken for different dimming levels, in order to develop polynomial functions between light output and consumed power. Using the measured data, a set of simulations were performed for a photosensor with an ideal cosine spatial sensitivity distribution installed in a typical office room using two control algorithms, closed loop and integral reset, trying to quantify the relative differences in energy savings. (c) 2007 Elsevier B.V. All fights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Energy and Buildings	en
dc.identifier.doi	10.1016/j.enbuild.2007.01.019	en
dc.identifier.isi	ISI:000251480200004	en
dc.identifier.volume	40	en
dc.identifier.issue	1	en
dc.identifier.spage	36	en
dc.identifier.epage	50	en