An analysis of energy-efficient light fittings and lighting controls

Li, Danny H.W.; Cheung, K.L.; Wong, S.L.; Lam, Tony N.T.

doi:10.1016/j.apenergy.2009.07.002

Cited by 137 publications

(46 citation statements)

References 21 publications

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“…Cheung [11] report a study where a reduction of 28 % in energy expenditure for electric lighting was obtained using energy-efficient lighting installation and high frequency dimming controls in a school building.…”

Section: Introductionmentioning

confidence: 99%

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A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Carlucci

Causone

Rosa

et al. 2015

Renewable and Sustainable Energy Reviews

335

156

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In the last decades, several studies aimed at assessing some specified aspects of visual comfort characterizing the relationship between the human needs and the light environment, such as an available amount of light, light uniformity, light quality in rendering colors, and predicting the risk of glare for space occupants. For each of them, a (still growing) number of indices and metrics have been proposed in literature and standards. In the present work, they are described, categorized according to common features, and finally discussed. As in the case of long-term thermal comfort indices, such visual comfort indices and their summation over a specified calculation period might be used for driving optimization processes to support a more conscious integrated design of buildings. To that purpose, the choice among the available visual comfort indices needs to be informed by an analysis of their features and implications. We present recommendations for use, and suggest areas where improvement is needed for their use in optimization processes to support buildings' design.

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Section: Introductionmentioning

confidence: 99%

“…Also a wise use of natural light may help reducing the electrical use for lighting [11]. Because of the high luminous efficacy [90 ÷ 120 lm/W] of daylight, also cooling loads may be contained, though this requires an accurate design of the building envelope and interiors.…”

Section: Introductionmentioning

confidence: 99%

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Carlucci

Causone

Rosa

et al. 2015

Renewable and Sustainable Energy Reviews

335

156

View full text Add to dashboard Cite

show abstract

“…3). The need of entry of the solar light into the interior of buildings and to ensure specific conditions have determined a constant evolution and innovation of devices for natural lighting, which can be divided into three different categories of components: passage, driving and control of the sunlight [8]. The passage components allow natural light to pass from one environment to another: windows, patio doors, skylights, domes, sheds, etc.…”

Section: Experimental and Resultsmentioning

confidence: 99%

Glass Surfaces for Benefits of Daylight in Social Housing

Salvo¹

2017

JERA

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Abstract. Internal environment and appropriate natural lighting of the building interior largely affects the health status and course of treatment of patients with psychiatric diagnoses such as depression, Alzheimer and disorder of functions. In particolar, this paper aims to show how smart glass surfaces, allowing the entry of natural lighting, can better support therapeutic process. It is important to elaborate knowledge for optimized lighting conditions in different healthy populations as well as in patients suffering from visual impairments and circadian rhythm disorders. To contribute to the development of new technologies about smart glass surfaces related to various aspects of light conditions for different populations and patients. In the process of preparation of architectural guidelines, it is essential to summarize the findings of the researchers, technologiest, designers, doctors and other related professionals working in particular environments and based on their incentives to specify requirements the architectural or technical design of the space for elederly people.

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“…A further lighting energy saving was observed when the high frequency lighting control dimmed the illuminance to the recommended value within a classroom. In [14], they analyzed the impact of shading and control systems on the energy demand for cooling and for lighting. Other studies similarly showed the potential energy savings concerned with high-efficiency lighting systems, window coating, occupancy profile and behavior or daylightlinked controls, with regard to quite different climates, from tropics to northern Europe [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

Verso

Mutani

Blaso

2014

Journal of Daylighting

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This paper critically discusses the procedure prescribed by the Italian Technical Standards to account for the internal gains in the calculation of the energy performance indices for a building. This procedure is based on a tabular value set depending on the building usage only (e.g., 6 W/m 2 for office buildings), independently of the site and of the controls for blinds and lighting systems. Instead, the paper proposes a new procedure, which relies on the lighting energy numerical indicator (LENI) according to the European Standard EN 15193:2007. Basically, the procedure consists of the following steps: 1) internal gains from lighting are calculated accounting for the integration between electric appliances and daylighting; 2) these gains are summed to the internal gains from occupants and appliances; 3) the global gains are used as input data to calculate the energy performance indices for an office building (for space heating, space cooling, and lighting consumption) following the Italian Technical Standards. The office building which was used as case-study is the Department of Energy of the Politecnico di Torino. This was assumed to be located both in Turin (northern Italy) and in Palermo (southern Italy). In the study, the use of a manual on/off switch and of a photodimming sensor was also compared. For each configuration, the single and the global energy performance indices were calculated comparing two approaches to calculate the internal gains (Italian standard vs. new proposed procedure): a shift of one energy class for the building energy label was observed depending on the approach, which was used. BackgroundThe demand for more energy efficient solutions has risen with the worldwide growing concern about energy consumption. Buildings have been identified to play a major role in potential energy saving and new directives and standards are being issued to bound the integrated energy performance of new or renovated buildings within prescribed limits: the implementation of the European energy performance of buildings directives (EPBD) [1][2][3] at various national levels requires all new buildings achieve a building energy rating (BER) lower than the prescribed target energy rating (TER) for the specific building type. Within the European Union, a formal commitment was agreed to reduce by 2020 the primary energy consumption and overall greenhouse gas emissions by at least 20% below 1990 levels [4]. Following a mandate received from the European Commission [5], the European organization for standardization (CEN) started elaborating the various standards concerned with the EPBD to define a methodology to calculate the integrated energy performance of a building. Although an EPBD-Project Group was established for this purpose, due to the delays in completing the whole process, several countries have already adopted national calculation methods. As a consequence, the energy performance of the same system may be evaluated differently in different countries [6]. With regard to the Italian context, the ...

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An analysis of energy-efficient light fittings and lighting controls

Cited by 137 publications

References 21 publications

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Glass Surfaces for Benefits of Daylight in Social Housing

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

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