scholarly journals Study of Linke Turbidity Factor on Solar Radiation over Jumla

2019 ◽  
Vol 9 ◽  
pp. 141-149
Author(s):  
Prakash M. Shrestha ◽  
Indra B. Karki ◽  
Narayan P. Chapagain ◽  
Khem N. Poudyal
Keyword(s):  
Air Pollution ◽  
Solar Radiation ◽  
Global Solar Radiation ◽  
Spectral Measurements ◽  
Annual Average ◽  
Average Value ◽  
Strong Relation ◽  
Rain Fall ◽  
Linke Turbidity Factor ◽  
Temperature Water

 Population growth, mechanization, and industrialization are the by product of human civilization and its resultant impacts goes to degrade the natural environment by the affecting of air-pollution and also associated with climatic change. Linke turbidity factor (LT) is an important parameter for assessing the air pollution at Jumla (Lat.:29.28o N, Long.: 82.16o E and Alt. 2300 masl). Because of the unavailability of spectral measurements data , a model has been used to estimate the Linke turbidity factor (TL) from broadband measurement of Global Solar radiation in 2012 .The annual average solar insolation, clearness index (KT) and extinction coefficient (K) are 5.11 ±2.34kWh/m2/day ,0.71 ± 0.12 and 0.25 ± 0.13 respectively. Similarly, the annual average value of Linke turbidity factor (LT) and visibility 1.97± 0.47 and 28.09 ± 21.08 km are found. Finally it is found that there is strong relation between Linke turbidity factor and meteorological parameters i.e. relative humidity, temperature, water content, ozone and rain fall.

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.

Analysis of Experimental Solar Radiation Data for Osogbo, Nigeria

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Abdulhamid Yusuf ◽  
Hakeem Bolarinwa ◽  
Lukman Animasahun ◽  
Yinusa Babatunde
Keyword(s):  
Solar Radiation ◽  
Global Solar Radiation ◽  
Total Radiation ◽  
Wet Season ◽  
Annual Average ◽  
Percentage Frequency ◽  
Monthly Average ◽  
Radiation Data ◽  
Maximum Value ◽  
Daily Total

An analysis of measured global solar radiation (GR) in Osogbo (7.77oN, 4.57oE, 288m) is presented in the form of hourly average, monthly average and percentage frequency distribution. The experimental data corresponds to a year data of 2017. The results reveal that the monthly average values of daily total radiation exhibit seasonal variation with maximum value in dry season month of March (16.59MJ/m2) and minimum value in wet season month of August (8.98 MJ/m2). The annual average GR value is 14.20 MJ/m2 while the annual cumulative GR is 5122 MJ/m2. The solar radiation climate of Osogbo has also been compared to those reported for a number of locations. The percentage frequency of days possessing irradiation rate greater than 15 MJ/m2 is 14 percent whereas that possessing less than 10 MJ/m2 is 61 percent. We conclude, based upon the above analysis that Osogbo is characterized by relatively low global solar radiation.

scholarly journals Study of Affecting Factors of Meteorological Parameters on Solar Radiation on Pokhara

2020 ◽  
pp. 45-52
Author(s):  
Prakash M. Shrestha ◽  
Jeevan Regmi ◽  
Usha Joshi ◽  
Khem N. Poudyal ◽  
Narayan P. Chapagain ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Negative Correlation ◽  
Meteorological Parameters ◽  
Energy Systems ◽  
Global Solar Radiation ◽  
Maximum Temperature ◽  
Affecting Factors ◽  
Clearness Index ◽  
Annual Average ◽  
Radiation Data

Solar radiation data are of great significance for solar energy systems. This study aimed to estimate monthly and seasonal average of daily global solar radiation on a horizontal surface in Pokhara (Lat.:28.21o N, Long.: 84o E and alt. 827 m above sea level), Nepal, by using CMP6 pyranometer in 2015. As a result of this measurement, monthly and yearly mean solar radiation values were 20.37 ±5.62 MJ/m2/ day in May, 11.37 ± 2.38 MJ/m2/ day in December and 16.82 ±5.24 MJ/m2/ day respectively. Annual average of clearness index and extinction coefficient are 0.51±0.14 and 0.53±0.31 respectively. There is positive correlation of maximum temperature and negative correlation of with global solar radiation.

scholarly journals Solar radiation modelling and measurement techniques in Lafia Zone, Nasarawa state, Nigeria

2020 ◽  
Vol 7 (1) ◽  
pp. 48-55
Author(s):  
Andah Mamman ◽  
Umaru Ibrahim ◽  
Mustapha M. Idris ◽  
Abdullahi A. Mundi ◽  
Musa U. Sarki
Keyword(s):  
Solar Radiation ◽  
Transmission Coefficient ◽  
Prediction Models ◽  
Measurement Techniques ◽  
Sampling Technique ◽  
Global Solar Radiation ◽  
Mean Value ◽  
Atmospheric Transmission ◽  
Average Value ◽  
Solar Radiation Intensity

The number of solar radiations measuring stations in Nigeria has been observed not to effectively describe the necessary variability; as such prediction models are necessary for estimation of solar radiation values using readily available meteorological variables. In this study, solar radiation parameters were determined for Lafia zone, Nasarawa State, Nigeria. Twelve (12) location were carefully selected to avoid sunshine and wind obstruction using a systematic random sampling technique. Three-hour daily measurement (12.00 pm to 2.00 pm) was done on three 12V, 5W solar panels using a pyranometer and the output was estimated using the Angstrom-Prescott Regression Equation. The continuity in the assembled system was measured using an Avometer. The result revealed that solar radiation intensity was found to range from 165.5 W/m2 to 298.6W/m2 with the mean value of 241.24 W/m2.The highest global solar radiation value of 29.8MJ/m2was observed in April while the lowest value of 16.5MJ/m2was observed in August. The extraterrestrial solar radiation was found to range from 9.06 MJ/m2 in August to 26.60 MJ/m2 in February with average value of 20.96MJ/m2. The atmospheric transmission coefficient over the year is found to range from 0.7 in July and September to 1.4 in December. The obtained atmospheric transmission coefficient determined for the year (2019) is a good indication for solar radiation application in Lafia geo-political zone, Nasarawa State. The performance of the developed model is observed to imply that it can be used to predict global solar radiation for Lafia zone in Nasarawa State.

scholarly journals Study of Solar Energy Potential using CMP6 Pyranometer at Nepalgunj, Nepal

2017 ◽  
Vol 3 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Bed Raj KC ◽  
Shekhar Gurung
Keyword(s):  
Seasonal Variation ◽  
Solar Radiation ◽  
Solar Energy ◽  
Sea Level ◽  
Global Solar Radiation ◽  
Energy Technology ◽  
Energy Potential ◽  
Annual Average ◽  
Average Temperature ◽  
Geographical Locations

The global solar radiation (GSR) is measured at the horizontal surface since 2011 using calibrated CMP6 Pyranometer at Nepalgunj which is located at an altitude 150m above sea level. This paper explains the daily, monthly and seasonal variation of global solar radiation and also compares temperature with global solar radiation. The average temperature in Nepalgunj varies between 44°C (it is hottest from May through July) and 30°C, although during winter (November-January) it can reach 4°C. The annual average daily global solar radiation is about 12.9MJ/m2/day which is sufficient to promote active and passive solar energy technology in Nepalgunj and other similar geographical locations.

scholarly journals Conditions influencing incoming global solar radiation in Hornsund (Spitsbergen) in spring 2015

2017 ◽  
Vol 38 (3) ◽  
pp. 333-349
Author(s):  
Joanna Uscka-Kowalkowska ◽  
Krzysztof M. Markowicz ◽  
Rajmund Przybylak ◽  
Andrzej Araźny
Keyword(s):  
Solar Radiation ◽  
Optical Depth ◽  
Sunshine Duration ◽  
Global Solar Radiation ◽  
Record Values ◽  
Climatic Conditions ◽  
Marine Aerosols ◽  
Anthropogenic Aerosols ◽  
Average Value ◽  
Incoming Solar Radiation

Abstract This article analyses the conditions affecting the incoming global solar radiation in Hornsund (Spitsbergen) in spring of 2015. Incoming solar radiation turned out to be average for the season under analysis, as compared with longer-term data. The clearness index (KT) was 0.46, and was mainly determined by the extent of cloudiness. As a result of differences in the length of day, sunshine duration in May was greater than in April. Incoming solar radiation to the earth’s surface is also affected by the atmospheric optical properties. The average value of aerosol optical depth (AOD) at 500 nm in Hornsund in spring of 2015 was 0.087. In the analysed period, increased values of AOD at 500 nm (up to 0.143) were observed, although these are not record values. Over April and May, the greatest part of optical depth was comprised of anthropogenic aerosols (41%), followed by marine aerosols (26%), desert dust (21%) and biomass-burning aerosols (12%). This indicates the significant role of the anthropogenic factor in the climatic conditions of Spitsbergen.

scholarly journals Estimation of Global Solar Radiation using Pyranometer and NILU-UV Irradiance Meter at Pokhara Valley in Nepal

2014 ◽  
Vol 9 (1) ◽  
pp. 69-78 ◽  
Author(s):  
K. N. Poudyal ◽  
B. K. Bhattarai ◽  
B. K. Sapkota ◽  
Berit Kjeldstad ◽  
N. R. Karki
Keyword(s):  
Solar Radiation ◽  
Global Solar Radiation ◽  
Energy Technology ◽  
Clearness Index ◽  
Annual Average ◽  
Uv Irradiance ◽  
Pokhara Valley ◽  
Geographical Characteristics ◽  
Transmittance Factor ◽  
Geographical Locations

The global solar radiation (GSR) and cloud transmittance factor (cf) are measured at the horizontal surface since 2009 using calibrated CMP6 Pyranometer and NILUUV Irradiance Meter at Pokhara (28.22°N, 83.32°E) which is about 800m from the sea level lying just 20km south of the Himalayas. This paper explains the daily, monthly and seasonal variation of global solar radiation and also compared with temperature and rainfall to global solar radiation. The annual average daily global solar radiation is about 4.81 kWh/m2/day which is sufficient to promote solar active and passive solar energy technology at sub-Himalaya terrain Pokhara and other similar geographical locations. The correlation coefficient 0.70 is found in between clearness index (K) and cloud transmittance factor (cf). This novel result can be used for location of similar meteorological and geographical characteristics at which solar data are not available. DOI: http://dx.doi.org/10.3126/jie.v9i1.10672Journal of the Institute of Engineering, Vol. 9, No. 1, pp. 69–78

scholarly journals Impact of Temperature, Rainfall and Clearness Index on Global Solar Radiation at Nepalgunj in Nepal

2019 ◽  
Vol 6 (1) ◽  
pp. 77-83
Author(s):  
Bed Raj K.C.
Keyword(s):  
Solar Radiation ◽  
Sea Level ◽  
Solar Irradiance ◽  
Meteorological Parameters ◽  
Global Solar Radiation ◽  
Solar Irradiation ◽  
Energy Technology ◽  
Clearness Index ◽  
Annual Average ◽  
The Impact

This paper reports the first experimental results on global solar irradiance measured at the horizontal surface since 2017 using calibrated Pyranometer-2 at Nepalgunj (Lat.28.05°N, Lon.81.62°E) which is about 150m from the sea level. This paper explains the impact of temperature, rainfall and clearness Index on the intensity of global solar irradiation. The annual average measured value of GSR 16.02 MJ/m2/day which is sufficient to promote solar active and passive solar energy technology at Nepalgunj and other similar geographic allocations. The results of this research can be utilized for the conformation of variation of solar radiation with meteorological parameters   and can be used for location of similar meteorological and geographical sites where solar data are not available.   

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