Evaluation of hourly solar radiation on inclined surfaces at Seoul by Photographical Method

Abstract Generally, a proper solar radiation model considers nothing more than the angle of inclination of a slope, without considering the influence of obstacles and surrounding buildings. In this study, we proposed a Photographical Method, which can increase the prediction accuracy of solar radiation on an inclined surface, with considering the shape of obstacles in the sky view. This paper evaluated twenty cases (5 solar radiation models in each of 4 albedo models), by the new method of the Photographical Method (PM). The following conclusions were drawn: (1) The prediction accuracy of solar radiation on an inclined surface was improved in all twenty cases with the PM. (2) The new method showed a higher degree of improvement of prediction accuracy in the low range of solar radiation (a high proportion of diffuse solar radiation). (3) The prediction accuracy of solar radiation with the PM improves with increasing tilt angle from the horizontal to the vertical. Applying the Photographical Method is more suited to an urban region with a forest of buildings, than a region of wide grasslands and sunny climate.

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

[3]  P. Ineichen,et al.  The importance of correct albedo determination for adequately modeling energy received by tilted surfaces , 1987 .

[4]  C. Ren,et al.  Sky view factor analysis of street canyons and its implications for daytime intra‐urban air temperature differentials in high‐rise, high‐density urban areas of Hong Kong: a GIS‐based simulation approach , 2012 .

[5]  Tariq Muneer,et al.  Models for the estimation of building integrated photovoltaic systems in urban environments , 2008 .

[6]  C. S. B. Grimmond,et al.  Rapid methods to estimate sky‐view factors applied to urban areas , 2001 .

[7]  A. Drummond.  On the measurement of sky radiation , 1956 .

[8]  Vittorio Ferraro,et al.  Experimental testing of models for the estimation of hourly solar radiation on vertical surfaces at Arcavacata di Rende , 2007 .

[9]  T. M. Klucher.  Evaluation of models to predict insolation on tilted surfaces , 1978 .

[10]  Lee Chapman,et al.  Sky‐view factor approximation using GPS receivers , 2002 .

[11]  B. Psiloglou,et al.  Measurements and models for total solar irradiance on inclined surface in Athens, Greece , 1994 .

[12]  M. Díez-Mediavilla,et al.  Measurement and comparison of diffuse solar irradiance models on inclined surfaces in Valladolid (Spain) , 2005 .

[13]  J. Mattsson,et al.  Canyon geometry, street temperatures and urban heat island in malmö, sweden , 1985 .

[14]  C. Gueymard.  An anisotropic solar irradiance model for tilted surfaces and its comparison with selected engineering algorithms , 1987 .

[15]  Lee Chapman,et al.  Real-Time Sky-View Factor Calculation and Approximation , 2004 .

[16]  E. Vartiainen,et al.  A new approach to estimating the diffuse irradiance on inclined surfaces , 2000 .

[17]  I. D. Watson,et al.  The determination of view-factors in urban canyons , 1984 .

[18]  C. Gueymard.  Mathermatically integrable parameterization of clear-sky beam and global irradiances and its use in daily irradiation applications , 1993 .

[19]  Benjamin Y. H. Liu,et al.  The long-term average performance of flat-plate solar-energy collectors , 1963 .

[20]  A. A. El-Sebaii,et al.  Global, direct and diffuse solar radiation on horizontal and tilted surfaces in Jeddah, Saudi Arabia , 2010 .

[21]  M. Eriksson,et al.  Sky view factors in forest canopies calculated with IDRISI , 2001 .

[22]  Fredrik Lindberg,et al.  Computing continuous sky view factors using 3D urban raster and vector databases: comparison and application to urban climate , 2009 .

[23]  T. Muneer.  Solar radiation and daylight models , 2004 .

[24]  B. Psiloglou,et al.  Estimation of the ground albedo for the Athens area, Greece , 2009 .

[25]  Tariq Muneer,et al.  Solar radiation model for Europe , 1990 .

[26]  Stoyanka Marinova Ivanova,et al.  Estimation of background diffuse irradiance on orthogonal surfaces under partially obstructed anisotropic sky. Part I - Vertical surfaces , 2013 .

[27]  W. Beckman,et al.  Evaluation of hourly tilted surface radiation models , 1990 .

[28]  Margaret C. Anderson.  Studies of the Woodland Light Climate: I. The Photographic Computation of Light Conditions , 1964 .

[29]  J. E. Hay,et al.  The Determination of Sky View-Factors in Urban Environments Using Video Imagery , 1986 .

[30]  P. Ineichen,et al.  A new simplified version of the perez diffuse irradiance model for tilted surfaces , 1987 .

[31]  L. Nkemdirim.  A Note on the Albedo of Surfaces , 1972 .

[32]  D. Lenschow,et al.  STUDY OF A CONTINENTAL SURFACE ALBEDO ON THE BASIS OF FLIGHT MEASUREMENTS AND STRUCTURE OF THE EARTH'S SURFACE COVER OVER NORTH AMERICA* , 1964 .

[33]  H. Manz,et al.  Empirical validation of models to compute solar irradiance on inclined surfaces for building energy simulation , 2007 .

[34]  C. Ratti,et al.  Urban texture analysis with image processing techniques , 1999 .

[35]  J. Monteith,et al.  Boundary Layer Climates. , 1979 .