Solar global radiation and climate at Genova, Italy

1981 ◽  
Vol 29 (1-2) ◽  
pp. 129-135 ◽  
Author(s):  
A. Elena ◽  
G. Flocchini ◽  
V. Pasquale
Author(s):  
Ikhsan Setiawan ◽  
Makoto Nohtomi ◽  
Masafumi Katsuta

It has been performed a simple simulation and calculation on solar energy collection which is used indirectly to power a thermoacoustic prime mover by producing pressurized hot steam which would supply thermal energy to the prime mover via sealed-off hot heat exchangers. The solar energy collection took place in Yogyakarta City - Indonesia where the average energy of solar global radiation of 4.8 kWh/m2/day (17.3MJ/m2/day) is available around the year. The calculation including the amount of the remaining heat stored, steam pressure, and steam temperature for various areas of the collector unit (Fresnel lens) and volume of water, were done as a function of time for several days. We found that appropriate combinations of lens area and water volume would enable us to operate the thermoacoustic prime mover continuously all day and night.


2008 ◽  
Vol 26 (3) ◽  
pp. 441-446 ◽  
Author(s):  
J. L. Borkowski

Abstract. Solar UV radiation variability in the period 1976–2006 is discussed with respect to the relative changes in the solar global radiation, ozone content, and cloudiness. All the variables were decomposed into separate components, representing variations of different time scales, using wavelet multi-resolution decomposition. The response of the UV radiation to the changes in the solar global radiation, ozone content, and cloudiness depends on the time scale, therefore, it seems reasonable to model separately the relation between UV and explanatory variables at different time scales. The wavelet components of the UV series are modelled and summed to obtain the fit of observed series. The results show that the coarser time scale components can be modelled with greater accuracy than fine scale components and the fitted values calculated by this method are in better agreement with observed values than values calculated by the regression method, in which variables were not decomposed. The residual standard error in the case of modelling with the use of wavelets is reduced by 14% in comparison to the regression method without decomposition.


2019 ◽  
Vol 4 (1) ◽  
Author(s):  
A. Sidibba ◽  
D. Ndiaye ◽  
S. Bouhamady ◽  
M. El Bah

The purpose of this work is to evaluate four empirical models developed in literature such as Ghouard, Perrin Brichambaut, Bird and Hulstrom and Dependent model of the Link trouble factor. The validation of these different theoretical models was carried out using solar global radiation data collected on the Cheikh Zayed Nouakchott power plant. These measurements were carried out at a time step of 5 minutes during the period of one year. (April 1, 2015 to March 31, 2016). The results show that the Ghouard model presents notable performances compared to the other models, with a determination coefficient of 96.2%. This validation also shows that the solar radiation measured and that estimated by the different models have the same pace and have good performance with a coefficient of determination greater than 93%. The available solar potential estimation was carried out using the actual measurements collected on the Cheikh Zayed plant. The results obtained showed that the available solar potential is 5 kWh / m² / d.


Energy ◽  
2006 ◽  
Vol 31 (14) ◽  
pp. 2728-2738 ◽  
Author(s):  
C JACOVIDES ◽  
V ASSIMAKOPOULOS ◽  
F TYMVIOS ◽  
K THEOPHILOU ◽  
D ASIMAKOPOULOS

2007 ◽  
Vol 48 (1) ◽  
pp. 259-268 ◽  
Author(s):  
Amiran Ianetz ◽  
Vera Lyubansky ◽  
Ilan Setter ◽  
Boris Kriheli ◽  
Efim G. Evseev ◽  
...  

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