An empirical approach to estimating monthly radiation on south-facing tilted planes for building application

This paper offers an empirical approach for estimating monthly solar radiation on south-facing tilted planes with inclinations from 0° to 90° for building solar energy application. By measurement and the modification of previous estimated irradiation data, which have not yet been verified, the regression equations of monthly slope irradiation ratio with no ground reflection were established. The equations were validated by measurement in Taipei with correlation factor R2=0.9648, and were compared with previous measurement using the Lin-estimate method. The estimated ratios of Taipei were compared with those of other cities in Taiwan. Results obtained from validation of simplified regression equations are good and practicable for building design application. Inputting the monthly the horizontal irradiation to the equations in the simplified estimative model, the monthly ratio and irradiation on the south-facing slopes can be calculated. Using the proposed calculation mechanism with local irradiation on horizontal and south-facing vertical planes to build the equations, this estimative method can also be used to conduct the local monthly irradiation on south-tilted planes for solar energy applications in other areas.

[1]  W. Beckman,et al.  Solar Engineering of Thermal Processes , 1985 .

[2]  M. Iqbal.  An introduction to solar radiation , 1983 .

[3]  Enrique Ruiz,et al.  Comparison of the Olmo model with global irradiance measurements on vertical surfaces at Madrid , 2002 .

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

[5]  J. Remund,et al.  On the generation of hourly shortwave radiation data on tilted surfaces. , 1998 .

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

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

[8]  Lucas Alados-Arboledas,et al.  Prediction of global irradiance on inclined surfaces from horizontal global irradiance , 1999 .

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

[10]  Hideyo Nimiya,et al.  A COMPARISON OF METHODS TO ESTIMATE GLOBAL IRRADIANCE ON TILTED SURFACES FROM HORIZONTAL GLOBAL IRRADIANCE , 1999 .

[11]  Lin Wenxian,et al.  Ratios of global radiation on a tilted to horizontal surface for Yunnan Province, China , 1995 .

[12]  Jan F. Kreider,et al.  Comparison of and discrepancies between TMY and TMY2S predictions for simple photovoltaic and wind energy simulations , 2001 .

[13]  C. L. Cheng,et al.  Empirical approach to BIPV evaluation of solar irradiation for building applications , 2005 .

[14]  A. Zemel,et al.  Validation of models for global irradiance on inclined planes , 1992 .

[15]  H. D. Behr.  Solar radiation on tilted south oriented surfaces: validation of transfer-models , 1997 .

[16]  L. M. Robledo,et al.  Modelling irradiance on inclined planes with an anisotropic model , 1998 .