Multi-criteria decision analysis to select the optimum position and proper field of view of a photosensor

Doulos, Lambros T.; Tsangrassoulis, Aris; Topalis, Frangiskos V.

doi:10.1016/j.enconman.2014.06.032

Cited by 70 publications

(36 citation statements)

References 26 publications

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“…The luminance gradation function, φ gives the relation of the luminance of a sky patch to its zenith angle [24]. φ and f are defined in Equations (2) and (3): f(χ)/f(Zs) = [1 + c{exp(dχ) − exp(dπ/2)} + e(cos2χ)]/[1 + c{exp(dZs) − exp(dπ/2)} + e(cos2Zs)],…”

Section: Sky Luminance Calculation Modelsmentioning

confidence: 99%

“…To reduce lighting energy consumption, it is important to forecast the indoor illuminance at the early design stage. If you are predicting indoor illuminance in the initial design stage, you can place light-based eco-friendly systems, such as a photosensor, to calculate energy savings accordingly [2]. When installing artificial lighting, it can be installed considering the indoor light environment so that efficient lighting design becomes possible [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Sky Luminance Measurements Using CCD Camera and Comparisons with Calculation Models for Predicting Indoor Illuminance

Yun

Kim

2018

Sustainability

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Abstract:In this study, we address the algorithm of the calculation formula from sky luminance distribution to vertical illuminance and indoor illuminance. To predict daylight, studies about sky luminance distributions and the DeLight daylight model were investigated. This paper compared three well-known sky distribution models (Perez model, Igawa model, and CIE standard sky model) with measured data. The charge coupled device (CCD) camera was used as a measurement method for sky luminance distribution. Indoor illuminance values calculated with those well-known sky distribution models are compared with measured indoor illuminance data. The following conclusions were obtained: (1) In the results of R 2 , mean bias error (MBE), and Cv(RMSE) analysis, the CIE standard sky model showed the lowest error rate with measured data. Between the Perez model and Igawa model, the Igawa model showed a lower error rate; (2) When we compared the sky classification of the Perez model and the Igawa model, both models classified the sky similarly to the CIE standard sky model in March. However, the classification of the sky in the CIE standard sky model, the Perez model, and the Igawa model differed in some of the July data because of high solar elevation; (3) The illuminance of the center point of the room was calculated using the well-known sky luminance distribution model, the Igawa model has a lower error rate than the Perez model in Korea.

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Section: Sky Luminance Calculation Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sky Luminance Measurements Using CCD Camera and Comparisons with Calculation Models for Predicting Indoor Illuminance

Yun

Kim

2018

Sustainability

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“…On the other hand, there are other findings suggesting that reduced southern window areas should be used. Benefits of smaller windows include lower heating load, better summer comfort (lower cooling energy demand and cooling load), reduction of daylight glare and cost [10][11][12]. All these factors also influence the optimal glazing parameters, which make the architect's decision even more difficult.…”

Section: Introductionmentioning

confidence: 99%

Energy balance calculation of window glazings in the northern latitudes using long-term measured climatic data

Kull¹,

Mauring²,

Tkaczyk³

2015

Energy Conversion and Management

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“…These effects are well documented, covering an area from improved health, well-being and productivity for the users, to significant building energy savings [1][2][3][4][5]. Lighting control systems can reduce energy use from electricity by 20% or even up to 60% in certain conditions [6][7][8]. A side benefit to proper daylighting are the reduced costs for cooling, as the amount of heat generated by the lighting system is also reduced [9].…”

Section: Introductionmentioning

confidence: 99%

A Review of Light Shelf Designs for Daylit Environments

et al. 2017

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Light shelves have been discussed in numerous studies as suitable solutions for controlling daylight in side-lit spaces. It is a system that can be easily modified, offering a range of design solutions. It can be easily mounted on the exterior and/or the interior of a vertical opening, it can come in various shapes from static flat forms to curved reflective surfaces, or it can even be actively controlled. A light shelf can offer shading and at the same time can redirect a significant part of the incoming light flux towards the ceiling improving daylight uniformity. Due to the aforesaid functions, light shelves are among the most popular system design solutions when it comes to daylight exploitation. The purpose of this paper is twofold. Firstly, to present the main research findings in relation to light shelves as daylighting systems and secondly to analyze the results, trying to establish a common basis for some efficient and practical design rules. The present paper is a review of the research realized in the last three decades concerning these systems together with their associated implications in a building's daylight performance as well as in its energy balance in a few cases. In addition, the critical review of their design principles is included, which makes the presented information useful for design teams trying to select the optimal available system for any specific project.

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Multi-criteria decision analysis to select the optimum position and proper field of view of a photosensor

Cited by 70 publications

References 26 publications

Sky Luminance Measurements Using CCD Camera and Comparisons with Calculation Models for Predicting Indoor Illuminance

Sky Luminance Measurements Using CCD Camera and Comparisons with Calculation Models for Predicting Indoor Illuminance

Energy balance calculation of window glazings in the northern latitudes using long-term measured climatic data

A Review of Light Shelf Designs for Daylit Environments

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