Results 241 to 250 of about 323,327 (303)

Global solar radiation estimation

Renewable Energy, 1997
Abstract This paper presents the comparison between the observed and estimated values of global solar radiation on horizontal surfaces obtained from the linear Angstrom type of correlation of Rehman and Halawani [1] for 52 cities spread in 11 countries; viz.
Shafiqur Rehman, Talal Omar Halawani
openaire   +1 more source

Estimating global solar radiation

Boundary-Layer Meteorology, 1975
A model is presented to calculate daily totals of global solar radiation. First, cloudless sky radiation is evaluated from transmission due to absorption and scattering. Cloud effects are added using cloud layer transmission. A simple expression to account for additional radiation due to reflection between the ground surface and cloud bases is also ...
J. A. Davies, W. Schertzer, M. Nunez
openaire   +1 more source

Autocorrelation of daily global solar radiation

Il Nuovo Cimento C, 1981
We show that the time series of daily valuesK T (ratios of global solar radiation on a horizontal surface to extra atmospherical radiation) cannot be statistically distinguished from a 1st-order autoregressive stochastic process. The analysis of Italian meteorological data shows that the first autocorrelation coefficient is a random variable which is ...
B. BARTOLI   +4 more
openaire   +2 more sources

Radiation-Hydrodynamic Waves and Global Solar Oscillations

Solar Physics, 1994
We investigate nonadiabatic hydrodynamic waves in a nongrey, radiating, thermally conducting, homogeneous atmosphere in LTE with a finite mean free path of photons. Avoiding the Eddington approximation the remaining simplifications in the basic equations are discussed, the generalized dispersion relation is analysed, and some wave properties in a grey ...
J. Staude   +2 more
openaire   +1 more source

Global solar radiation estimation in Algeria

Energy Conversion and Management, 2001
In this paper, two models for estimating monthly average daily global radiation on a horizontal surface have been applied to four different locations. The first one is an empirical model, originally formulated by Barbaro et al. (Solar Energy 20 (1978) 431). Some modifications have been suggested.
M. Chegaar, A. Chibani
openaire   +1 more source

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