Evaluation of hourly tilted surface radiation models

Journal Article · Sun Dec 31 23:00:00 EST 1989 · Solar Energy (Journal of Solar Energy Science and Engineering); (USA)

DOI:https://doi.org/10.1016/0038-092X(90)90061-G· OSTI ID:6125747

Reindl, D T; Beckman, W A; Duffie, J A ^[1]

---

1. Univ. of Wisconsin, Madison (USA)

This study investigates the performance of the isotropic and four anisotropic hourly tilted surface radiation models by using monthly average hourly utilizable energy as a standard of measure. Utilizable energy is the radiation above a specified threshold level. Differences between the utilizable energy measured and the utilizable energy predicted are observed for various surface slope/azimuth orientations and critical radiation levels. Normalized root mean square difference and normalized mean bias difference statistics are formed to quantify the ability of each model to estimate the utilizable energy on a tilted surface. The influence of horizontal diffuse radiation on tilted surface model performance is examined by comparing the predicted utilizable energy on a tilted surface using both measured horizontal diffuse and estimated horizontal diffuse found from diffuse fraction correlations. On an overall basis, the isotropic sky model showed the poorest performance and is not recommended for estimating the hourly radiation on a tilted surface. The anisotropic models have comparable performance to each other. There was no significant degradation of tilted surface model performance when the diffuse radiation is estimated from a diffuse fraction correlation rather than obtained from measurements.

• OSTI ID: 6125747
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (USA), Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (USA) Vol. 45:1; ISSN SRENA; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140100* -- Solar Energy-- Resources & Availability
ANISOTROPY
ARIZONA
DIFFUSE SOLAR RADIATION
ENERGY
ENERGY SOURCES
EQUATIONS
EQUIPMENT
EVALUATION
FEDERAL REGION II
FEDERAL REGION IX
FEDERAL REGION VI
FORECASTING
HOURLY VARIATIONS
INCLINATION
ISOTROPY
MATHEMATICAL MODELS
NEW MEXICO
NEW YORK
NORTH AMERICA
PERFORMANCE
PREDICTION EQUATIONS
RADIATIONS
RENEWABLE ENERGY SOURCES
SOLAR COLLECTORS
SOLAR ENERGY
SOLAR EQUIPMENT
SOLAR FLUX
SOLAR RADIATION
STELLAR RADIATION
TEXAS
USA
VARIATIONS