The average distribution of solar radiation-correlations between diffuse and hemispherical and between daily and hourly insolation values

Collares-Pereira, Manuel; Rabl, Ari

doi:10.1016/0038-092x(79)90100-2

Cited by 812 publications

(218 citation statements)

References 13 publications

Supporting

Mentioning

200

Contrasting

Unclassified

Order By: Relevance

“…In the present study we analyse the long-term operation of pumping systems applying: (a) the isotropic model of diffuse radiation for the calculation of the radiation received by inclined surfaces; 8 (b) correlation analysis to determine the daily diffuse radiation; 9 and (c) the expressions developed by Collares-Pereira et al 10 to compute the hourly values of radiation from the daily values. Considering also the relationship between the direct radiation received by an inclined plane and by a horizontal plane, depending upon geometric factors, we may determine the monthly average radiation values for different levels of atmospheric clearness, for different months and times of day, both for inclined stationary PV arrays facing south and for tracking arrays with a polar axis.…”

Section: Methodsmentioning

confidence: 99%

Comparative study by simulation of photovoltaic pumping systems with stationary and polar tracking arrays

Illanes

Francisco

Torres

et al. 2003

Progress in Photovoltaics

View full text Add to dashboard Cite

Using mathematical models for the different components of the photovoltaic pumping system: generator, inverter (if applicable), motors, pumps and piping, we have developed a computer program that, for given irradiance and temperature data, calculates the flow of water pumped at any given time. The program has been applied to study the hourly and yearly water flow pumped by a photovoltaic pumping system located in Madrid, employing centrifugal pumps powered by AC motors. The photovoltaic generator consists of, in one case, a stationary array and in the second case a polar tracking array. The hourly radiation data were estimated from the distribution of the atmospheric clearness coefficients and the monthly average daily radiation on a horizontal surface. The results of this study show that the use of a polar tracking array increases the average yearly water flow compared with the stationary array more than the corresponding increase of the incident radiation on the arrays.

show abstract

Section: Methodsmentioning

confidence: 99%

Comparative study by simulation of photovoltaic pumping systems with stationary and polar tracking arrays

Illanes

Francisco

Torres

et al. 2003

Progress in Photovoltaics

View full text Add to dashboard Cite

show abstract

“…Diffuse fraction, the ratio of diffuse to global irradiation, is estimated from the clearness index with the equations proposed in [35].…”

Section: Effective Irradiationmentioning

confidence: 99%

“…The ratio of the diffuse irradiance to diffuse irradiation is assumed to be equivalent to the ratio of extraterrestrial irradiance to extraterrestial irradiation. The ratio of global irradiance to daily global irradiation is estimated with the equations proposed in [35]. It must be noted that, because of the frequent low variability of solar irradiance, this step assumes that the average value of irradiance during a short time interval (for example, an hour) coincides numerically with the irradiation during that interval.…”

Section: Effective Irradiationmentioning

confidence: 99%

See 1 more Smart Citation

Comparative assessment of global irradiation from a satellite estimate model (CM SAF) and on-ground measurements (SIAR): A Spanish case study

Antoñanzas-Torres

Cañizares²,

David

2013

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

An analysis and comparison of daily and yearly solar irradiation from the satellite CM SAF database and a set of 301 stations from the Spanish SIAR network is performed using data of 2010 and 2011. This analysis is completed with the comparison of the estimations of effective irradiation incident on three different tilted planes (fixed, two axis tracking, north-south horizontal axis) using irradiation from these two data sources. Finally, a new map of yearly values of irradiation both on the horizontal plane and on inclined planes is produced mixing both sources with geostatistical techniques (kriging with external drift, KED)The Mean Absolute Difference (MAD) between CM SAF and SIAR is approximately 4% for the irradiation on the horizontal plane and is comprised between 5% and 6% for the irradiation incident on the inclined planes. The MAD between KED and SIAR, and KED and CM SAF is approximately 3% for the irradiation on the horizontal plane and is comprised between 3% and 4% for the irradiation incident on the inclined planes.The methods have been implemented using free software, available as supplementary material, and the data sources are freely available without restrictions.

show abstract

“…In an investigation by Collres-Pereira and Rabl [15] developed an analytical expression for the ratio of hourly to daily global radiation: …”

Section: Extraterrestrial Radiation On Horizontal Surfacementioning

confidence: 99%

Simulation of Solar Radiation System

Alam¹,

Chowdhury²,

Saha³

et al. 2005

American J. of Applied Sciences

View full text Add to dashboard Cite

Abstract:In this research work, a mathematical model for simulation of the solar radiation system has been developed by using a system dynamics methodology. Bangladesh is used here for model validation. The simulated results obtained from this model have compared with the experimental results and found reasonably a good agreement. Therefore the performance of the model is to be expected as satisfactory.

show abstract

The average distribution of solar radiation-correlations between diffuse and hemispherical and between daily and hourly insolation values

Cited by 812 publications

References 13 publications

Comparative study by simulation of photovoltaic pumping systems with stationary and polar tracking arrays

Comparative study by simulation of photovoltaic pumping systems with stationary and polar tracking arrays

Comparative assessment of global irradiation from a satellite estimate model (CM SAF) and on-ground measurements (SIAR): A Spanish case study

Simulation of Solar Radiation System

Contact Info

Product

Resources

About