scholarly journals Validation study of an overall radiation balance estimation method under Ponta Grossa (PR) Brazil weather conditions

2014 ◽  
Vol 34 (3) ◽  
pp. 461-472
Author(s):  
Gustavo C. Beruski ◽  
André B. Pereira
Keyword(s):  
Solar Radiation ◽  
Classical Method ◽  
Estimation Method ◽  
Farming Systems ◽  
Weather Conditions ◽  
Global Solar Radiation ◽  
Radiation Balance ◽  
State University ◽  
Statistical Parameters ◽  
Natural Processes

Radiation balance is the fraction of incident solar radiation upon earth surface which is available to be used in several natural processes, such as biological metabolism, water loss by vegetated surfaces, variation of temperature in farming systems and organic decomposition. The present study aimed to assess and validate the performance of two estimation models for Rn in Ponta Grossa city, Paraná State, Brazil. To this end, during the period of 04/01/2008 to 04/30/2011, from radiometric data collected by an automatic weather station set at the Experimental Station, of the State University of Ponta Grossa. We performed a linear regression study by confrontation between measurements made through radiometric balance and Rn estimates obtained from Brunt classical method, and the proposed method. Both models showed excellent performance and were confirmed by the statistical parameters applied. However, the alternative method has the advantage of requiring only global solar radiation values, temperature, and relative humidity.

scholarly journals Concentrator photovoltaic module architectures with capabilities for capture and conversion of full global solar radiation

2016 ◽  
Vol 113 (51) ◽  
pp. E8210-E8218 ◽  
Author(s):  
Kyu-Tae Lee ◽  
Yuan Yao ◽  
Junwen He ◽  
Brent Fisher ◽  
Xing Sheng ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Large Scale ◽  
Experimental Studies ◽  
Weather Conditions ◽  
Global Solar Radiation ◽  
Photovoltaic Module ◽  
Module Design ◽  
Direct Normal Irradiance ◽  
Cost Of Energy

Emerging classes of concentrator photovoltaic (CPV) modules reach efficiencies that are far greater than those of even the highest performance flat-plate PV technologies, with architectures that have the potential to provide the lowest cost of energy in locations with high direct normal irradiance (DNI). A disadvantage is their inability to effectively use diffuse sunlight, thereby constraining widespread geographic deployment and limiting performance even under the most favorable DNI conditions. This study introduces a module design that integrates capabilities in flat-plate PV directly with the most sophisticated CPV technologies, for capture of both direct and diffuse sunlight, thereby achieving efficiency in PV conversion of the global solar radiation. Specific examples of this scheme exploit commodity silicon (Si) cells integrated with two different CPV module designs, where they capture light that is not efficiently directed by the concentrator optics onto large-scale arrays of miniature multijunction (MJ) solar cells that use advanced III–V semiconductor technologies. In this CPV+scheme (“+” denotes the addition of diffuse collector), the Si and MJ cells operate independently on indirect and direct solar radiation, respectively. On-sun experimental studies of CPV+modules at latitudes of 35.9886° N (Durham, NC), 40.1125° N (Bondville, IL), and 38.9072° N (Washington, DC) show improvements in absolute module efficiencies of between 1.02% and 8.45% over values obtained using otherwise similar CPV modules, depending on weather conditions. These concepts have the potential to expand the geographic reach and improve the cost-effectiveness of the highest efficiency forms of PV power generation.

scholarly journals Study of Affecting Factors of Meteorological Parameters on Solar Radiation in Kathmandu Valley

The Batuk ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 72-80
Author(s):  
Prakash M. Shrestha ◽  
Khem N. Poudyal ◽  
Narayan P. Chapagain ◽  
Indra B. Karki
Keyword(s):  
Solar Radiation ◽  
Meteorological Parameters ◽  
Weather Conditions ◽  
Global Solar Radiation ◽  
Solar Irradiation ◽  
Maximum Temperature ◽  
Affecting Factors ◽  
Air Mass ◽  
High Level ◽  
Relative Sunshine

Solar radiation data are great significance for solar energy systems. This study aimed to estimate monthly and seasonal average daily global solar radiation on a horizontal surface in Kathmandu (27.7oN, 85.5oE, 1350 masl), Nepal, by using CMP6 pyranometer in 2012. The influence of the global solar irradiation from different physical as well as meteorological parameters was analyzed. Besides this, the research highlighted that there is high level of fluctuation of the measured value of global solar irradiance due to local weather conditions. As a result of this measurement, the maximum, minimum monthly and yearly mean solar radiation values were (21.32 ± 4.14) MJ/m2/day in May,(10.93 ± 2.03) MJ/m2/day in January and (16.68 ± 4.60)MJ/m2/day found respectively. Annual average of clearness index, maximum temperature, minimum temperature, relative sunshine hour, air mass are 0.51 ± 0.12, (26.23 ± 4.96)oC, (12.38 ± 6.83)oC, 0.57 ± 0.165 and 1.54 ± 0.42 respectively. There is positive correlation of maximum temperature and negative correlation of air mass with global solar radiation.

Evaluation of the regression parameters of the Angstrom-Page model for predicting global solar radiation

2013 ◽  
Vol 24 (2) ◽  
pp. 46-49 ◽  
Author(s):  
Solomon Agbo
Keyword(s):  
Solar Radiation ◽  
Statistical Tests ◽  
Global Solar Radiation ◽  
Mean Bias Error ◽  
Percentage Error ◽  
Bias Error ◽  
Statistical Parameters ◽  
New Model ◽  
Page Model ◽  
Regression Parameters

A simple and empirical model for the estimation of average monthly global solar radiation for a Nigerian location is presented. Regression coefficients satisfying the Angstrom-page model have been obtained using clearness index (KT) and the relative sunshine data for the location. The test of validity of the model was done by evaluating the following statistical parameters: the mean bias error (MBE), root mean square error (RMSE), mean percentage error (MPE) and the correlation coefficient (CC). The results obtained from the statistical tests show that the new model is reliable for high precision estimation of global solar radiation. A comparison between the new model and other models is presented.

Simulation of Solar Radiation Heat Flux Data for Energy Calculation

1996 ◽  
Vol 118 (1) ◽  
pp. 58-63 ◽  
Author(s):  
A. Panek ◽  
Y. Lee ◽  
H. Tanaka
Keyword(s):  
Solar Radiation ◽  
Global Solar Radiation ◽  
Solar Irradiation ◽  
Easy Access ◽  
Energy Calculation ◽  
Radiation Heat ◽  
Statistical Parameters ◽  
Solar Radiation Intensity ◽  
Autocorrelation Time ◽  
Level Of Agreement

The global (or total) and diffuse solar irradiation data are not always available in many areas of the world and they have to be estimated using some sort of empirical models. This paper describes how the sequence of hourly irradiation data can be simulated using some statistical parameters of the global solar radiation intensity such as the monthly average and variance of its daily maxima and autocorrelation time constant. The results of this simulation are compared with the measured data for two different locations, Ottawa, Canada and Warsaw, Poland (these two locations are chosen because of easy access to the radiation data). The comparison shows an acceptable level of agreement between the simulated and measured results.

scholarly journals Improving the S-Shape Solar Radiation Estimation Method for Supporting Crop Models

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Nándor Fodor
Keyword(s):  
Solar Radiation ◽  
Relative Error ◽  
Estimation Method ◽  
Global Solar Radiation ◽  
Model Calculations ◽  
Site Specific ◽  
Crop Models ◽  
Step Procedure ◽  
The Usa ◽  
Original Formula

In line with the critical comments formulated in relation to the S-shape global solar radiation estimation method, the original formula was improved via a 5-step procedure. The improved method was compared to four-reference methods on a large North-American database. According to the investigated error indicators, the final 7-parameter S-shape method has the same or even better estimation efficiency than the original formula. The improved formula is able to provide radiation estimates with a particularly low error pattern index () which is especially important concerning the usability of the estimated radiation values in crop models. Using site-specific calibration, the radiation estimates of the improved S-shape method caused an average of () relative error in the calculated biomass. Using only readily available site specific metadata the radiation estimates caused less than 5% relative error in the crop model calculations when they were used for locations in the middle, plain territories of the USA.

scholarly journals Structure of radiation balance in diverse types of relief

2015 ◽  
Vol 47 (4) ◽  
pp. 343-354 ◽  
Author(s):  
Zbigniew Caputa ◽  
Jakub Wojkowski
Keyword(s):  
Land Use ◽  
Solar Radiation ◽  
Small Area ◽  
Global Solar Radiation ◽  
Wave Radiation ◽  
Radiation Balance ◽  
Full Spectrum ◽  
Plant Groups ◽  
One Year ◽  
Radiation Conditions

Abstract Structure of radiation balance in diverse types of relief. The article presents the results of research on the structure of radiation balance in the full spectrum in diverse types of relief. The study was carried out on the Kraków-Częstochowa Upland (Poland). The varying terrain, its forms, expositions and slopes, large denivelations, and the varying land cover and land use make this small area very diverse as far as radiation conditions are concerned. On the basis of an actinometrical study the structure of radiation balance was assessed in two distinct morphologic terrain forms: the bottom of the valley and the plateau. It was proved that the global solar radiation (K↓) reaching the bottom of the valley in one year was on average 15% lower than the solar energy reaching the plateau. The all wave radiation balance (Q*) at the bottom of the valley was 16% less than on the plateau. The result of complex radiation conditions in the diversified relief was the occurrence of a mosaic of plant groups with distinct requirements.

scholarly journals Solar energy storage by grain crops

2020 ◽  
Vol 82 (1) ◽  
pp. 59-63
Author(s):  
G. S. Kudryashev ◽  
I. V. Dykus ◽  
S. V. Batishchev
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Spring Barley ◽  
Weather Conditions ◽  
High Yield ◽  
Radiation Balance ◽  
Forage Crops ◽  
Grain Crops ◽  
Irkutsk Region ◽  
The Crimea

Irkutsk region is rich in land that is suitable for agricultural activities. The total sown area of agricultural crops in the Irkutsk region is 759 thousand hectares (2019). The main place is occupied by grain and leguminous crops, the total area of which is 540 thousand hectares (71.1%). In their structure, the first place belongs to spring wheat, the second place is taken by spring barley, the third-by oats. Due to the need to strengthen the feed base, forage crops play an increasing role. Yield depends on many factors, primarily weather conditions. For photosynthesis, plant crops need sunlight. By the number of Sunny days, the Irkutsk region is not inferior to the Crimea. There are 221 Sunny days per year. If weather conditions are correctly predicted, a high yield can be achieved. To assess the absorption of solar energy by grain crops, the radiation balance was considered in this article. Photosynthetic plant pigments absorb light and convert it from solar energy to chemical energy, which results in active plant growth. To forecast the future harvest, it is necessary to calculate the intensity and duration of solar radiation, which is the most important condition for further production of agricultural products. A study was conducted on the effectiveness of using insolation in the Irkutsk region for sowing wheat. The radiation balance was compiled, which allowed us to identify the maximum solar radiation favorable for wheat growth. To determine the amount of effective radiation, measurements were made of soil temperature, air humidity, and meteorological conditions in the Irkutsk region.

scholarly journals Study of Impact of Linke Turbidity on Solar Radiation over Kathmandu Valley

Patan Pragya ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 191-198
Author(s):  
Prakash M. Shrestha ◽  
Khem N Poudyal ◽  
Narayan P. Chapagain ◽  
Indra B. Karki
Keyword(s):  
Air Pollution ◽  
Solar Radiation ◽  
Global Solar Radiation ◽  
Kathmandu Valley ◽  
Spectral Measurements ◽  
Average Value ◽  
Pollution Levels ◽  
Natural Processes ◽  
The World ◽  
Linke Turbidity Factor

Population growth, mechanization, and industrialization have now made humanity the equivalent of other natural processes in its effect on air-pollution levels and associated climatic change. Link turbidity is an important parameter for assessing the air pollution of Kathmandu (Lat.:27.72oN, Long.: 85.32oE and Alt.: 1350 m. above sea level). The Because of the unavailability of spectral measurements, a model has been used to estimate the Linke turbidity factor (TL) from broadband measurements of Global Solar radiation on 2012 by using CMP6 paranometer. The average value of extinction coefficient (K) and Linke turbidity are 0.69 ± 0.03 and 5.53±0.23$ respectively, which can be compared with other sites around the world. Relationship between turbidity co-efficient with meterological parameters (humidity, temperature and water contained) have been investigated further.

scholarly journals Radiation balance of coffee hedgerows

2008 ◽  
Vol 12 (3) ◽  
pp. 274-281 ◽  
Author(s):  
Luiz R. Angelocci ◽  
Fábio R. Marin ◽  
Felipe G. Pilau ◽  
Evandro Z. Righi ◽  
José L. Favarin
Keyword(s):  
Solar Radiation ◽  
Cover Crops ◽  
Ground Cover ◽  
Global Solar Radiation ◽  
Important Variable ◽  
Field Conditions ◽  
Radiation Balance ◽  
Net Radiation ◽  
Energy Exchanges ◽  
Good Agreement

The radiation balance of hedgerows is an important variable in studies of mass and energy exchanges between parcial ground cover crops and the atmosphere. This paper describes a device with eight net radiometers encompassing the plants of a hedgerow. The radiometers were moved along a length of hedgerow, in a continuous and reversible movement. The canopy net radiation in this length (Rnc) was found by integration of the measurements over the notional cylinder formed. The device showed good performance and provided reliable measurements of Rnc of coffee hedgerows, showing itselfto be an useful technique of measurement in field conditions. Good correlations between Rnc and global solar radiation, turfgrass and coffee crop net radiation were found in 15-min, daytime and 24-hr periods, allowing the possibility of estimating Rnc from these simple measurements. Beer’s law was also used to have an independent estimation of Rnc. A good agreement was found between values of Rnc estimated by this law of attenuation and those integrated by the device in periods of 15 min, with overestimation of 10%, whereas for values integrated over daytime periods the agreement was not satisfactory.

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