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Mangkuto, R. A., Feradi, F., Putra, R. E., Atmodipoero, R. T. & Favero, F. (2018). Optimisation of daylight admission based on modifications of light shelf design parameters. Journal of Building Engineering, 18, 195-209
Open this publication in new window or tab >>Optimisation of daylight admission based on modifications of light shelf design parameters
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2018 (English)In: Journal of Building Engineering, ISSN 2352-7102, Vol. 18, p. 195-209Article in journal (Refereed) Published
Abstract [en]

This study was conducted to optimise daylight admission as ambient lighting in an open-plan examination room of a dental hospital in Bandung, Indonesia. Parametric design was conducted for new light shelves, to be placed on the east and west façades of the building. Optimisation was performed using genetic algorithm, taking into account the external and internal widths, external tilt angles, and specularity of the light shelves, for two scenarios: keeping and removing the existing overhangs on both façades. The optimisation objectives were to maximise the spatial daylight autonomy at the perimeter area (sDA300/50%(p)) and minimise the annual sunlight exposure (ASE1000,250) on the occupied floor area of the examination room. Different optimised values were obtained for the east and west façades. In the first scenario, the resulting objective function yields an increase of 4.9% compared to existing condition, whereas the increase is 16.7% in the second scenario. Both metrics in the second scenario have satisfied the criterion. Uncertainty in the first scenario is found smaller than that in the second scenario, due to the removal of overhangs that bring more daylight in the latter.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Annual sunlight exposure, Daylight, Genetic algorithm, Light shelf, Optimisation, Spatial daylight autonomy
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-227535 (URN)10.1016/j.jobe.2018.03.007 (DOI)000432780300019 ()2-s2.0-85044539459 (Scopus ID)
Note

QC 20180518

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-06-13Bibliographically approved
Nylén, P., Favero, F., Glimne, S., Fahnehjelm, K. T. & Eklund, J. (2014). Vision, light and aging: A literature overview on older-age workers. Work: A journal of Prevention, Assessment and rehabilitation, 47(3), 399-412
Open this publication in new window or tab >>Vision, light and aging: A literature overview on older-age workers
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2014 (English)In: Work: A journal of Prevention, Assessment and rehabilitation, ISSN 1051-9815, E-ISSN 1875-9270, Vol. 47, no 3, p. 399-412Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: In many western countries individuals will need to continue their professional careers beyond the current retirement age. This requires adaptation of the working conditions to compensate for age related visual changes. OBJECTIVE: The aim of this paper is to compile and structure knowledge concerning age related changes in visual and non-visual functions among older-age workers and to describe in what way these changes relate to light and work performance. METHOD: An overview of the literature was performed in PubMed and EMBASE concerning visual changes among elderly people, light, visual ergonomics and consequences at work. RESULTS: Visual conditions and lighting design have an impact on work performance in those over age 65 even if there are few studies available. Natural age related changes in the eyes or ocular diseases can result in reduced visual function and performance. Moreover, evidence of the importance of light and dark rhythms for circadian regulation is mounting; there are indications that the older-age population might need specific attention related to this issue. Finally, visual deteriorations might also, secondarily, induce strained postures and musculoskeletal symptoms, pain and injury. CONCLUSION: Age-related changes in the eyes and also ocular diseases among older-age people have an impact on well-being and work performance, and therefore call for reconsideration of their working conditions. Knowledge about how visual functions, light and ocular diseases is needed for work design and preventive actions.

Keywords
Retirement age, visual function, visual perception, circadian rhythm
National Category
Work Sciences
Identifiers
urn:nbn:se:kth:diva-144339 (URN)10.3233/WOR-141832 (DOI)000333080700013 ()24463318 (PubMedID)2-s2.0-84900422574 (Scopus ID)
Note

QC 20140422

Available from: 2014-04-22 Created: 2014-04-22 Last updated: 2020-06-05Bibliographically approved
Teär Fahnerhjelm, K., Aronsson, K., Ejhed, J., Eklund, J., Favero, F., Glimne, S., . . . Törnquist, A. L. (2012). Belysning och utveckling av undersökningsrum: Multifunktionsrum i sjukvården.
Open this publication in new window or tab >>Belysning och utveckling av undersökningsrum: Multifunktionsrum i sjukvården
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2012 (Swedish)Report (Other academic)
Abstract [en]

Employees in an eye hospital spend many hours in semidarkness or darkness performing visually demanding activities that can cause fatigue and eye strain. As preparation for the planning of a new eye hospital, this project was initiated in order to produce knowledge of how to improve lighting in examination rooms. Current light conditions at S:t Erik Eye Hospital were assessed including questionnaires to employees/patients, and measurements of luminance, space analyses and energy consumption. Visits to other prominent eye hospitals and a literature review were performed. The questionnaires revealed that eyestrain problems were common in eye care professionals, especially in women. Working in dark rooms increased the subjective feeling of fatigue. Many, but not all, lacked daylight. The general lighting system was often insufficient with poor light distribution, shadows, and a colour temperature that in general was too low. Improvements included possibilities to regulate inflow of daylight, installation of remote controls, and timing and level of adaptation to different light levels. These improvements have been tested in a real scale installation that used the latest technology in terms of artificial lighting, a lighting control systems and a novel solution to control daylight. Five different light scenarios were preinstalled and evaluated by professionals and patients. A majority reported an improvement compared with traditional solutions. Current and actual energy consumption was monitored. Simulations of future consumption points to a possible energy reduction by 50 %, using new lighting technology, daylight and optimal room design. With improved logistics, new buildings and new work organization, energy savings can be even higher, around 70 %.

Publisher
p. 274
Series
Rapport, S:t Eriks Ögonsjukhus och KTH
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-117472 (URN)
Note

QC 20130611

Available from: 2013-01-30 Created: 2013-01-30 Last updated: 2013-06-11Bibliographically approved
Favero, F., Glimme, S., Teär Fahnerhjelm, K. & Eklund, J. (2012). Kunskapsöversikt: Syn och belysning för äldre i arbetslivet.
Open this publication in new window or tab >>Kunskapsöversikt: Syn och belysning för äldre i arbetslivet
2012 (Swedish)Report (Other (popular science, discussion, etc.))
Publisher
p. 50
Series
Rapport 2012: Arbetsmiljöverket, ISSN 1650-3171 ; 16
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:kth:diva-117471 (URN)
Note

QC 20130529

Available from: 2013-01-30 Created: 2013-01-30 Last updated: 2018-01-11Bibliographically approved
Favero, F. (2011). Natural light lighting qualities for the design of future spaces development of a methodology. In: 27TH SESSION OF THE CIE, VOL. 1, PTS 1 AND 2: . Paper presented at 27th Session of the International-Commission-on-Illumination (CIE), JUL 10-15, 2011, South Africa (pp. 482-487). C I E CENTRAL BUREAU
Open this publication in new window or tab >>Natural light lighting qualities for the design of future spaces development of a methodology
2011 (English)In: 27TH SESSION OF THE CIE, VOL. 1, PTS 1 AND 2, C I E CENTRAL BUREAU , 2011, p. 482-487Conference paper, Published paper (Refereed)
Abstract [en]

This paper wants to contribute to the development of a novel methodology in which daylight and artificial light are combined in the definition of the user's experience of architectural space. This experience is based upon the three systems that are triggered by light, visual, biological and perceptual/psychological. Natural Light is an attempt to deal with the issue of quality in spaces under a human perspective. This paper resumes the theoretical question that is leading a PhD research work, the result of a workshop developed in the city of Stockholm and the practical and methodological applications that will follow.

Place, publisher, year, edition, pages
C I E CENTRAL BUREAU, 2011
Keywords
Natural, daylight, artificial, conditions, exposure, design
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-153468 (URN)000329312800061 ()978-3-901906-99-2 (ISBN)
Conference
27th Session of the International-Commission-on-Illumination (CIE), JUL 10-15, 2011, South Africa
Note

QC 20141006

Available from: 2014-10-06 Created: 2014-10-03 Last updated: 2017-01-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2562-2108

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