The role of spectral response of photosensors in daylight responsive systems

Doulos, L; Tsangrassoulis, A; Topalis, FV

dc.contributor.author	Doulos, L	en
dc.contributor.author	Tsangrassoulis, A	en
dc.contributor.author	Topalis, FV	en
dc.date.accessioned	2014-03-01T01:29:20Z
dc.date.available	2014-03-01T01:29:20Z
dc.date.issued	2008	en
dc.identifier.issn	0378-7788	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19230
dc.subject	Daylight	en
dc.subject	Photosensor	en
dc.subject	Spectral response	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Computer simulation	en
dc.subject.other	Daylighting	en
dc.subject.other	Electric lighting	en
dc.subject.other	Energy conservation	en
dc.subject.other	Illuminating engineering	en
dc.subject.other	Optical resolving power	en
dc.subject.other	Photosensitivity	en
dc.subject.other	Daylight	en
dc.subject.other	Photosensors	en
dc.subject.other	Spectral response	en
dc.subject.other	Optical sensors	en
dc.title	The role of spectral response of photosensors in daylight responsive systems	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enbuild.2007.04.010	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enbuild.2007.04.010	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Lighting control technologies using photosensors have a great potential for energy savings in areas with high levels of daylight. Although the proper application of these controls can exploit this potential, unfortunately, it has been accomplished in a small percentage of new projects. One reason is the difficulty in justification of energy savings, which in turn, is directly linked with the simulation of the behaviour of these lighting controls. The core of these systems is the photosensor, which adjusts the electric light output in proportion to the amount of the daylight that detects, using its spatial and spectral response. The aim of this study is to quantify the impact of photosensor spectral response on its illuminance values, by taking into account various daylight spectra as these are modified due to various types of coloured glazing. Five commercial photosensors were selected and their spectral response was measured. In addition, spectral transmittance of 16 commercial types of glazing was measured as well. Using these data, a set of simulations were performed using three colour channels in a typical office room and the relative differences in illuminance - and thus energy savings - among the photosensors are presented. The results show that differences are significant ranging from 36 to 118%, a fact that can affect the estimated payback period of a lighting control. system. (c) 2007 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Energy and Buildings	en
dc.identifier.doi	10.1016/j.enbuild.2007.04.010	en
dc.identifier.isi	ISI:000252789000020	en
dc.identifier.volume	40	en
dc.identifier.issue	4	en
dc.identifier.spage	588	en
dc.identifier.epage	599	en