Abstract
This work aims to use the response surface methodology to develop models for assessing monthly mean global solar radiation. Fifteen years of meteorological data (1986–2000) is used from 22 locations in India. From the data, an overall of 6 input parameters are selected (sunshine duration, temperature difference, humidity, precipitation, wind speed, and atmospheric pressure). The effect of each independent input parameter on the response (clearness index) is evaluated using different numbers and combinations of input parameters (ranging from two to six inputs) thereby resulting in 5 categories. A total of 57 empirical equations are developed using Minitab-19. The performance of the proposed models is compared by making use of statistical error tests. Further, these equations are ranked through the use of the global performance indicator. For each category, the best model is evaluated and the overall top model is also suggested. Global performance indicator values were in the range of − 3.907 to 0.948. Response plots are developed for the best models under each category and the effect of input parameters is discussed. Response surface methodology is found to be a modest and effective technique, and the models developed can be precisely used in different regions based on the availability of meteorological parameters.
Highlights
• Global solar radiation is estimated based on six meteorological input parameters.
• Response surface methodology is used to correlate the clearness index with variables.
• Fifty-seven models under five categories (based on the number of input variables) are suggested.
• Contours are made to analyze response with input variables (taken two at a time).
• Errors analysis and GPI suggest that model 54 exhibits the best performance.






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Data availability
All data used in the study are freely available online from the corresponding data sources cited in the article. However, data that support the findings of this study are available on request from the corresponding author.
Code availability
Not applicable.
Abbreviations
- er-MAX:
-
Maximum absolute relative error
- FR :
-
Rainfall (mm)
- GPI:
-
Global performance indicator
- \(\mathrm{h}\) :
-
Altitude (m)
- \(\mathrm{H}\) :
-
Global solar radiation on a horizontal surface (MJ/ m2-day)
- Ho:
-
Extraterrestrial solar radiation (MJ/m2-day)
- \(\mathrm{H}/\mathrm{Ho}\) :
-
Clearness index
- MAE:
-
Mean absolute error (MJ/m2-day)
- MBE:
-
Mean bias error (MJ/m2-day)
- MPE:
-
Mean percentage error (%)
- MARE:
-
Mean absolute relative error
- PA :
-
Atmospheric pressure (hPa)
- S:
-
Monthly mean hours of bright sunshine (h)
- SD:
-
Standard deviation of the difference between estimated and measured values
- So:
-
Monthly mean hours of maximum possible sunshine (h)
- S/So:
-
Relative sunshine period
- t-stats:
-
T-statistics (MJ/m2-day)
- ΔT:
-
Mean monthly daily Temperature difference (°C)
- RH :
-
Relative humidity (%)
- RMSE:
-
Root mean square error (MJ/m2-day)
- RRMSE:
-
Relative root mean square error ( −)
- TR:
-
Temperature ratio = \(\left({~}^{{T}_{max}}\!\left/ \!{~}_{{T}_{min}}\right.\right)\)
- V:
-
Wind speed (km/h)
- \(\varnothing\) :
-
Latitude (°)
- \(\psi\) :
-
Longitude (°)
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YU conceptualized performed investigations and wrote original draft. BJ proposed methodology, provided supervision, created the outline of study, and revised the manuscript. SS performed the analysis of results, validation, and visualization.
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Upadhyay, Y., Jamil, B. & Saud, S. Implementing an advanced data-driven response surface approach to estimate global solar radiation based on multiple inputs. Theor Appl Climatol 152, 1075–1094 (2023). https://doi.org/10.1007/s00704-023-04448-7
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DOI: https://doi.org/10.1007/s00704-023-04448-7

