Vectorial algebra algorithms for calculating terrain parameters from DEMs and solar radiation modelling in mountainous terrain

2003 ◽  
Vol 17 (1) ◽  
pp. 1-23 ◽  
Author(s):  
Javier G. Corripio
Keyword(s):  
Solar Radiation ◽  
Mountainous Terrain ◽  
Radiation Modelling ◽  
Terrain Parameters

scholarly journals Evaluation of Solar Radiation Transposition Models for Passive Energy Management and Building Integrated Photovoltaics

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 702 ◽  
Author(s):  
Carlos Toledo ◽  
Ana Maria Gracia Amillo ◽  
Giorgio Bardizza ◽  
Jose Abad ◽  
Antonio Urbina
Keyword(s):  
Solar Radiation ◽  
Horizontal Plane ◽  
Architectural Design ◽  
Operating Conditions ◽  
Geographical Information ◽  
Medium Temperature ◽  
Building Integrated Photovoltaics ◽  
Wide Range ◽  
Radiation Modelling ◽  
Winter Time

Incident solar radiation modelling has become of vital importance not only in architectural design considerations, but also in the estimation of the energy production of photovoltaic systems. This is particularly true in the case of buildings with integrated photovoltaics (PV) systems having a wide range of orientations and inclinations defined by the skin of the building. Since solar radiation data at the plane of interest is hardly ever available, this study presents the analysis of two of the most representative transposition models used to obtain the in-plane irradiance using as input data the global and diffuse irradiation on the horizontal plane, which can be obtained by satellite-based models or ground measurements. Both transposition models are validated with experimental measurements taken in Murcia (southeast of Spain) and datasets provided by the photovoltaic geographical information system (PVGIS) and the National Renewable Energy Laboratory (NREL) for vertical surfaces facing the four cardinal points. For the validation, the mean bias deviation, root mean square error and forecasted skill were used as indicators. Results show that the error rate decreases slightly for clear days. Better results are also obtained by dismissing data with low solar elevation angles so as to avoid shadowing effects from the surroundings in the early and late hours of the day, which affects mainly the performance of the transposition models for west and east surfaces. The results highlight the potential of equator-facing façades in winter time when the received irradiation can be twice as much as the one collected by the horizontal plane. It is also noteworthy that the operating conditions of all façades are mainly low irradiance and medium temperature at these locations.

Predicting the spectral and broadband aerosol transmittance in the atmosphere for solar radiation modelling

1997 ◽  
Vol 12 (3) ◽  
pp. 259-279 ◽  
Author(s):  
B.E. Psiloglou ◽  
M. Santamouris ◽  
D.N. Asimakopoulos
Keyword(s):  
Solar Radiation ◽  
Radiation Modelling

Improvement of radiation modelling during cloudy sky days using in-situ and satellite measurements. 

2021 ◽  
Author(s):  
Lea Al Asmar ◽  
Luc Musson-Genon ◽  
Eric Dupont ◽  
Karine Sartelet
Keyword(s):  
Solar Radiation ◽  
Wrf Model ◽  
Cloud Fraction ◽  
Satellite Measurements ◽  
Radiation Model ◽  
Radiometric Measurements ◽  
Observational Site ◽  
Radiation Modelling ◽  
The Impact

<p>Solar radiation modelling is important for the evaluation and deployment of solar renewable energy systems. The amount of solar radiation reaching the ground is influenced by geographical parameters (seasons, latitude and local characteristics of the site) and meteorological and atmospheric parameters (like humidity, clouds or particles). Those parameters have important spatio-temporal variations that make solar radiation hard to model. </p><p>Various radiation models exist in literature. Among them, the 1D radiation model part of the computational fluid dynamics software “Code_Saturne” estimates the global and direct solar irradiances at the ground. It takes into account the impact of meteorology, atmospheric gas, particles and clouds whose influence is represented using the two-stream approximation. </p><p>The model showed satisfactory results during clear-sky days  but not during cloudy-sky days. It is a common problem in solar radiation modelling, because of the complexity to accurately represent  clouds, which are extremely variable in space and time and have a strong influence on the depletion of solar irradiance.  </p><p>In the current study, the estimation of radiation during cloudy-sky days is improved by coupling the 1D radiation model of Code_Saturne with on-site and satellite measurements of the cloud optical properties. Meteorological data are obtained from the Weather Research and Forecasting (WRF) model, aerosol’s concentrations from the air-quality modelling platform Polyphemus, and on-site measurements from the SIRTA observational site (close to Paris). Two periods are simulated: 'august 2009' and 'year 2014'. It is shown that the introduction of the measured cloud properties in the computation of the surface radiation fluxes leads to a strong reduction of the simulated errors, compared to the case where these properties are derived from the WRF model.                    </p><p>A sensitivity analysis on the parameters representing clouds in the model is conducted. It enabled us to identify the most influencing parameters - cloud optical thickness (COD) and cloud fraction - and instruments that are sufficient and mandatory for a good description of solar radiation during cloudy-sky days. A fitted model is developed to deduce the COD from liquid water path measurements. Satellite and radiometric measurements could both be used, although satellite measurements are not always available.  For the estimation of cloud fraction, the best results are obtained from shortwave radiometric measurements or from a sky imager. Moreover, large error cases in hourly values of solar fluxes are examined to understand their origin. For a large part of these error cases, there is a high variation within the hour of satellite or in situ measurements, or the presence of low clouds (in more than 50% of these cases in august 2009). </p><p> </p>

Simple solar radiation modelling for different cloud types and climatologies

2015 ◽  
Vol 124 (1-2) ◽  
pp. 141-160 ◽  
Author(s):  
Viorel Badescu ◽  
Alexandru Dumitrescu
Keyword(s):  
Solar Radiation ◽  
Radiation Modelling

Seasonal Variations of Atmospheric Clearness Numbers for Use in Solar Radiation Modelling

1981 ◽  
Vol 5 (3) ◽  
pp. 185-187 ◽  
Author(s):  
D. Y. Goswami ◽  
D. E. Klett ◽  
E. K. Stefanakos ◽  
T.K. Goswami
Keyword(s):  
Solar Radiation ◽  
Seasonal Variations ◽  
Radiation Modelling

Calculation of solar radiation in mountainous terrain

1987 ◽  
Vol 40 (3) ◽  
pp. 233-249 ◽  
Author(s):  
Alan L Flint ◽  
Stuart W Childs
Keyword(s):  
Solar Radiation ◽  
Mountainous Terrain
Sign in / Sign up

Export Citation Format

Share Document