The Daylighting Contribution in the Electric Lighting Energy Uses: EN Standard and Alternative Method Comparison

Zinzi, Michele; Mangione, Alessandro

doi:10.1016/j.egypro.2015.11.342

Cited by 12 publications

(8 citation statements)

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“…Decisions regarding the daylighting system, determining or reviewing the elements of artificial lighting system, as well as selection of appropriate control systems must be meticulously examined. In this sense, it has been demonstrated by various studies that up to 60% energy conservation can be achieved for lighting energy consumption by using daylighting strategies [8][9][10]. The potential of the control system on lighting energy saving have been also investigated in a number of studied [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Re-Thinking lighting system design based on visual comfort and energy performance

Kilic¹,

Yener²

2019

JCEMI

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Global warming and changing climatic conditions, as well as over-consumption of energy resources have led to the discussion of sustainable and energy-efficient approaches. The buildings have one of the most significant roles in over-energy consumption causing various global effects. Therefore, the importance of developing energy-efficient and energy-retrofit strategies in buildings has been increasing day by day. This study aims to introduce a sustainable lighting system design approach for new and refurbished buildings in terms of visual comfort and energy performance in accordance with the current standards. "TS EN 12464-1:2013 Light and lighting-Lighting of workplaces-Part 1: Indoor workplaces", which describes basic requirements for visual comfort and "TS EN 15193-1:2017 Energy Performance in Buildings-Energy requirements for lighting-Part 1: Specifications", which introduces a renewed and updated methodology to estimate lighting energy performance in buildings are used as the metrics for the approach offering to design sustainable lighting system. Office space for two people is selected as a sample in order to apply the developed approach. Obtaining results demonstrate that the lighting-retrofit design strategies have a great positive impact on visual comfort conditions and energy consumption in the office buildings, where energy use for lighting accounts for a huge proportion of the total energy consumption as well as providing visual comfort conditions is very important.

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Section: Introductionmentioning

confidence: 99%

Re-Thinking lighting system design based on visual comfort and energy performance

Kilic¹,

Yener²

2019

JCEMI

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“…The Daylight factor is the reference parameter used in this Standard to assess daylight contribution in buildings. A critical aspect of the EN15193:2008 (EC-1:2011) [11] is the overestimation of the lighting energy use, especially in southern European countries, as reported in [12][13][14][15][16][17][18][19][20]. In [12] the number of daylight/non-daylight hours through a climatic data set of outdoor diffuse illuminance is calculated.…”

Section: Introductionmentioning

confidence: 99%

“…A critical aspect of the EN15193:2008 (EC-1:2011) [11] is the overestimation of the lighting energy use, especially in southern European countries, as reported in [12][13][14][15][16][17][18][19][20]. In [12] the number of daylight/non-daylight hours through a climatic data set of outdoor diffuse illuminance is calculated. These climatic data are used to determine whenever the level of mean illuminance on the working area is lower than the minimum values required by EN 12464-1 [21] and consequently the artificial lighting system needs to be switched on.…”

Section: Introductionmentioning

confidence: 99%

“…These climatic data are used to determine whenever the level of mean illuminance on the working area is lower than the minimum values required by EN 12464-1 [21] and consequently the artificial lighting system needs to be switched on. Both in [12,16] the Daylight Factor parameter is applied for putting in relation the outdoor and indoor lighting conditions: the strengths of this parameter are the quickness and ease of use but on the other side its simplicity could lead to less accurate and precise results.…”

Section: Introductionmentioning

confidence: 99%

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Towards a More Sustainable City: The Role of the Daylight Factor in Evaluating the Energy Requirements of Buildings

Benedetta¹,

Fabio²,

Alessandro³

et al. 2018

IJSCER

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The Daylight factor is the reference parameter used in Energy Standard EN15193:2008 to assess daylight contribution in the energy performance of buildings. But its efficacy in putting in relation buildings energy performance, daylight availability and visual tasks is now a subject of discussion in literature. In fact, the daylight factor is a static indicator independent from building geometry and environmental parameters. From the energy point of view, it has still to be assessed if it can ensure when the switch of artificial light is needed, representing therefore the most disadvantageous outdoor illuminance conditions. The goal of this study is demonstrating if the daylight factor calculated in standard conditions (Overcast sky) is conservative respect to that calculated using the diffuse component of the horizontal illuminance under CIE (Commission Internationale de l'Éclairage) Clear sky. If so, Daylight factor (D) might be applied, possibly with suitable corrections, to estimate the energy requirements for lighting, keeping the results on the safe side. 

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“…Figure 1 shows a schematic representation of the flow chart to calculate FD and of the space segmentation into Daylit and Non-Daylit Areas. More information about the calculation method of the EN15193 standard can be found in Tian and Su (2014), Zinzi and Mangione (2015), and in Aghemo et al (2016). With the new standard, building practitioners are supplied with an analytical method, which accounts also for climate conditions, orientations and movable shadings, to calculate the daylight contribution in a space and therefore the LENI, without any simulations.…”

Section: Introductionmentioning

confidence: 99%

Validation of the EN 15193:2017 calculation method to estimate the daylight supply in a building: comparison with dynamic climate-based simulations

Verso¹,

Paragamyan²,

Pellegrino³

2018

Healthy, Intelligent and Resilient Buildings and Urban Environments

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This paper compares a simplified method to calculate the daylight factor and the annual daylight contribution in a space to the output of dynamic daylighting simulations. The simplified calculation method is the one implemented in the European Standard EN 15193 for the calculation of the energy demand for lighting in buildings, while the tool for dynamic simulations is Daysim (managed through DIVA-for-Rhino). The analysis was carried out by applying the two approaches to a reference office room, which was assumed to be located in different sites and having different window areas, with different orientations, both in the absence and in the presence of a mobile shade. The presence of an obstructing building was also considered. A total number of 108 cases was considered for the comparison. The results showed a very good correlation between the analytical method and the Daysim simulations to calculate the daylight factor (R 2 =0.99, with an absolute average difference of 11%). The correlation was lower for the calculation of the annual daylight contribution (R 2 =0.86, with an absolute average difference of 35%), due to the complexity of variables included (climate, orientation, presence of a moveable shade). Among the variables, the higher differences between the analytical and simulation results were observed for the climate and the absence/presence of a shade.

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The Daylighting Contribution in the Electric Lighting Energy Uses: EN Standard and Alternative Method Comparison

Cited by 12 publications

References 1 publication

Re-Thinking lighting system design based on visual comfort and energy performance

Re-Thinking lighting system design based on visual comfort and energy performance

Towards a More Sustainable City: The Role of the Daylight Factor in Evaluating the Energy Requirements of Buildings

Validation of the EN 15193:2017 calculation method to estimate the daylight supply in a building: comparison with dynamic climate-based simulations

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