Research Article
Comparative Analysis of All-Sky Luminous Efficacy Models Based on Calculated and Measured Solar Radiation Data of Four Worldwide Cities
Table 3
Summary of the comparative analysis for selected luminous efficacy models.
| | Station, country (measured year) | Model | Global illuminance | Diffuse illuminance | | MBE (%) | RMSE (%) | | MBE (%) | RMSE (%) | |
| | Lyon, France (1994) | Perez | −0.4 | 7.3 | 0.99 | −4.3 | 12.5 | 0.97 | | Average | 0.2 | 8.1 | 0.99 | −2.2 | 12.2 | 0.94 | | Littlefair | −3.2 | 13.1 | 0.99 | 0.0 | 10.9 | 0.96 |
| | Golden, CO. USA (2007) | Perez | 0.2 | 10.4 | 0.99 | — | — | — | | Average | 2.4 | 8.4 | 0.99 | — | — | — | | Littlefair | −6.1 | 19.3 | 0.97 | — | — | — |
| | Manchester, UK (1993) | Perez | −9.3 | 11.4 | 0.99 | −13.5 | 16.7 | 0.99 | | Average | −11.0 | 13.9 | 0.99 | −7.9 | 11.5 | 0.99 | | Littlefair | −4.4 | 15.3 | 0.97 | 4.4 | 9.8 | 0.99 |
| | Fukuoka, Japan (1994) | Perez | −8.1 | 12.0 | 0.98 | −21.0 | 24.1 | 0.98 | | Average | −8.6 | 11.5 | 0.98 | −18.6 | 21.5 | 0.97 | | Littlefair | −8.7 | 15.5 | 0.96 | −7.4 | 10.6 | 0.98 |
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