Zenith radiance was measured in Pamplona (Spain) during sixteen months under different sky conditions. 5th degree polynomials that relate log(Lz) with solar elevation return the best correlations both when considering the entire dataset as well as when data are split into the five sky conditions...

The paper describes a methodology for creating synthetic time series of the fifteen standard sky types considered by the Commission International d'Eclairage (CIE). Since the measurements of sky luminance and accordingly CIE sky types are limited to a small number of locations, it is important...

The present technical note describes a computer tool for determining the horizon brightness diffuse irradiance on a tilted plane in the model of Perez. The applied procedure considers the configuration factor concept, which is calculated using the unit-sphere method. The results obtained with...

This work presents a comparison among seventeen different proposals for estimating the hourly diffuse fraction of irradiance. Twelve of them are polynomial correlations of different orders, two are based on a logistic function and the three last ones consider the diffuse irradiance values in the...

This paper presents the development of an energy management strategy of a Plug-in Hybrid Electric Vehicle (PHEV). In this case, a rule-based optimal controller selects the appropriate operation mode. Furthermore, advantages and drawbacks of such vehicles are compared with respect to other...