Simplified correlations of global, direct and diffuse luminous efficacy on horizontal and vertical surfaces

A simple calculation method to calculate the mean hourly global, direct and diffuse illuminance on horizontal and vertical surfaces for all sky, clear sky, intermediate and overcast sky conditions, initially developed for Arcavacata di Rende (Italy), was compared with experimental data obtained at Geneva (Switzerland), Vaulx-en-Velin (France), Bratislava (Slovakia) and Osaka (Japan). The method is based on the use of constant luminous efficacies, adopted also for the vertical surfaces. In spite of its simplicity, the method furnishes reasonably good predictions, in comparison with a more complex reference calculation method and can be proposed as a simplified tool for design purposes.

[1]  G. W. Larson,et al.  Rendering with radiance - the art and science of lighting visualization , 2004, Morgan Kaufmann series in computer graphics and geometric modeling.

[2]  S. Treado,et al.  Correlations of solar irradiance and daylight illuminance for building energy analysis , 1984 .

[3]  L. M. Robledo,et al.  Estimation of global illuminance on inclined surfaces for clear skies , 2003 .

[4]  F. Kasten,et al.  A new table and approximation formula for the relative optial air mass , 1964 .

[5]  L. M. Robledo,et al.  On the luminous efficacy of diffuse solar radiation , 2001 .

[6]  L. M. Robledo,et al.  Dependence on surface orientation of coefficients in the circumsolar simplified Perez illuminance model for vertical planes at Madrid , 1998 .

[7]  Alfonso Soler,et al.  Assessment of Muneer’s Luminous Efficacy Models in Madrid and a Proposal for New Models Based on His Approach , 2001 .

[8]  L. M. Robledo,et al.  Luminous efficacy of direct solar radiation for all sky types , 2001 .

[9]  M. Uschold,et al.  Methods and applications , 1953 .

[10]  Vittorio Ferraro,et al.  Correlations of direct solar luminous efficacy for all sky, clear sky and intermediate sky conditions and comparisons with experimental data of five localities , 2008 .

[11]  Surapong Chirarattananon,et al.  Evaluation of vertical illuminance and irradiance models against data from north Bangkok , 2007 .

[12]  T. Muneer,et al.  Models for estimating solar radiation and illuminance from meteorological parameters , 2000 .

[13]  L. M. Robledo,et al.  Global luminous efficacies on vertical surfaces for all sky types , 2000 .

[14]  Roberta Vieira Gonçalves de Souza,et al.  Clear sky and all sky direct luminous efficacies for Florianópolis, Brazil , 2005 .

[15]  A. Ferrero,et al.  Measurement uncertainty , 2006, IEEE Instrumentation & Measurement Magazine.

[16]  P. Littlefair.  The luminous efficacy of daylight: a review , 1985 .

[17]  J. Michalsky,et al.  Modeling daylight availability and irradiance components from direct and global irradiance , 1990 .

[18]  Vittorio Ferraro,et al.  Predicting diffuse illuminance on vertical surfaces at Arcavacata di Rende (Italy) for various types of sky , 2008 .

[19]  M. Cucumo,et al.  Correlations of global and diffuse solar luminous efficacy for all sky conditions and comparisons with experimental data of five localities , 2008 .

[20]  Danny H.W. Li,et al.  Evaluation of slope irradiance and illuminance models against measured Hong Kong data , 2000 .