Sky luminance measurements and comparisons with calculation models

Ferraro, Vittorio; Mele, Marilena; Marinelli, V.

doi:10.1016/j.jastp.2011.04.009

Cited by 16 publications

(14 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It potentially increases the chance of measurement errors. However, sky luminance distribution can often be characterized by certain luminance gradation pattern (Ferraro et al, 2011;Perez et al, 1993;Torres et al, 2010). With the utilization of content-aware image post-processing that takes into account of the sky luminance gradation, reasonably close reconstructions of the blocked sky were expected and verified in the study.…”

Section: Acquisition Of the Sky Luminance Distributionmentioning

confidence: 64%

“…Research on the SC modeling has mainly focused on understanding the pattern of the sky luminance distribution and linking the sky model in simulations to real-world sky conditions (Ferraro et al, 2011;Ng et al, 2007;Perez et al, 1993;Torres et al, 2010). While these studies demonstrate a great variety of the sky luminance distribution in fine spatial resolution, their experiments also indicate the need of a new sky mapping system for daylight simulation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An HDRi-based data acquisition system for the exterior luminous environment in the daylight simulation model

Chiou

Huang

2015

Solar Energy

View full text Add to dashboard Cite

Section: Acquisition Of the Sky Luminance Distributionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

An HDRi-based data acquisition system for the exterior luminous environment in the daylight simulation model

Chiou

Huang

2015

Solar Energy

View full text Add to dashboard Cite

“…The CIE standard sky model does not provide clear criteria for the selection of sky types [15]. The CIE guide [25] recommends a method of calculating the value of the ratio of the zenith luminance to the horizontal diffuse illuminance, Lz/EdH.…”

Section: Calculation Methods Of Cie Standard Sky Modelmentioning

confidence: 99%

“…The value of the ratio of the zenith luminance to the horizontal diffuse illuminance, L z /E dH , is one of the proposed criteria of the choice of CIE sky types [25]. This criterion has been studied and showed validity only when the solar altitude is lower than 30 degrees [15]. If the solar altitude is higher than 30 degrees, it is difficult to select one category because there is an intersection in the graph.…”

Section: Cie Standard General Sky Modelmentioning

confidence: 99%

“…That method has no application limits, and needs knowledge of the measured luminances. This method compares the measured values with the 15 types of CIE standard sky, respectively, and then selects the sky with the minimum RMSE value [12,15,28]. In this paper, the CIE sky model was not used for the analysis of indoor illuminance.…”

Section: Cie Standard General Sky Modelmentioning

confidence: 99%

See 1 more Smart Citation

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

Yun

Kim

2018

Sustainability

View full text Add to dashboard Cite

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.

show abstract

Evaluation of a hybrid photo-radiometer sky model compared with the Perez sky model

Kong

Utzinger

Humann³

2018

Energy and Buildings

View full text Add to dashboard Cite

Sky luminance measurements and comparisons with calculation models

Cited by 16 publications

References 12 publications

An HDRi-based data acquisition system for the exterior luminous environment in the daylight simulation model

An HDRi-based data acquisition system for the exterior luminous environment in the daylight simulation model

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

Evaluation of a hybrid photo-radiometer sky model compared with the Perez sky model

Contact Info

Product

Resources

About