A review of regression models employed for predicting diffuse solar radiation in North-Western Africa

Ogbulezie, Julie C.; Ushie, Ogri J.; Nwokolo, Samuel Chukwujindu

doi:10.17737/tre.2017.3.2.0042

Cited by 13 publications

(6 citation statements)

References 49 publications

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“…In addition to latitude, orientation, and tilt angle, the intensity of cloud cover [44] and snow accumulation [45] should also be taken into consideration when deciding on the optimal tilt angle and orientation for a PV system in order to maximize its efficiency and ensure that it continues to yield the maximum possible energy output over time. Furthermore, the results of this research provide a valuable insight into the importance of accurately assessing the local climate conditions and taking all relevant factors into consideration when deciding on the optimal tilt angle and orientation for a PV system in order to maximize its efficiency and ensure that it continues to yield the maximum possible energy output over time.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, although Bujumbura and Yaounde reported equivalent latitudes (3.61 o N and 3.84 oN, respectively), their yearly global solar radiation registered 194.4 W/m 2 and 184.3 W/m2, respectively indicating that Bujumbura receives significantly more solar radiation than Yaounde due to the different cloud cover [45], and snow accumulation factors [46] demonstrating that these are important elements to consider when making decisions regarding PV systems in different locations. The study further showed that even in locations with similar latitudes, other local climate factors such as cloud cover and snow accumulation could significantly affect the performance of a PV system and, therefore, should be taken into consideration in order to ensure that the PV system continues to yield the maximum possible energy output over its lifetime.…”

Section: Resultsmentioning

confidence: 99%

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Assessing the Impact of Soiling, Tilt Angle, and Solar Radiation on the Performance of Solar PV Systems

Nwokolo

Obiwulu²,

Amadi³

et al. 2023

Tr Ren Energ

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This research examined the observed datasets and a theoretically derived model for estimating yearly optimum tilt angle (β), maximum incident solar radiation (Hmax), clean gain indicator (CGI), and soiling loss indicator (SLI) at Mumbwa, Zambia, the Mediterranean Region, and low latitude locations across the globe. The cleaned tilted collector emerged as the best performing collector due to Hmax and much higher energy gains compared with the soiled collector. CGI showed an appreciable performance of 0.4737% over -0.4708% on the SLI, indicating that soiling on the surface of photovoltaic (PV) modules significantly depreciates the overall performance of PV modules. Two established empirical models obtained from the literature were compared with the established theoretical model (β=φ). The result revealed that the two models overestimated the observed annual optimum tilt angle in this paper, simply because the models were developed with high latitude location datasets from the Asia continent. However, the newly established monthly and yearly global radiation indicator (GRI) models by the authors in their previous paper performed excellently in the selected representative cities in the Mediterranean region.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Assessing the Impact of Soiling, Tilt Angle, and Solar Radiation on the Performance of Solar PV Systems

Nwokolo

Obiwulu²,

Amadi³

et al. 2023

Tr Ren Energ

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“…This is due to the reduction in global radiation entering the surface due to the obstruction of gases and aerosols in the atmosphere. The amount of diffuse radiation is higher when the atmosphere is cloudy than when the atmosphere is cloudy or sunny (Ogbulezie et al 2017). This is because the atmosphere in a clean condition indicates that the gas and aerosol content is less than when the atmosphere is in a cloudy state.…”

Section: Global Radiation Analysis and Diffuse Radiationmentioning

confidence: 99%

Increasing smog haze and its impact on oil palm evapotranspiration and gross primary production during the 2015 fire: special discussion on diffuse radiation

Aulia

June²,

Koesmaryono

2022

JPSL

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In 2015, several regions in Indonesia experienced drought which coincided with the El Nino phenomenon. A drought in Indonesia followed by fires has resulted in oil palm plantations in Jambi being covered by smog. The fire phenomenon has a major impact on the weakening of the sun that enters the earth's surface due to the closure of the atmosphere by thick smog so that it affects gross primary production (GPP) and evapotranspiration of oil palm. This study aims to analyze the intensity of smog based on diffuse radiation and analyze the relationship and pattern of GPP and evapotranspiration to diffuse radiation during the occurrence of smog in 2015. PM10 concentration as a representation of aerosols in the atmosphere on atmospheric transmissivity is negatively correlated with r = -0.8 and p-value = 0.0016. The high diffuse radiation is directly proportional to the atmospheric conditions covered by smog. When the smog cover in the atmosphere was at its peak in October 2015, most of the incoming solar radiation was diffuse radiation. The diffuse fraction with GPP and evapotranspiration was also negatively or inversely correlated. Both have a significant relationship with p-value < 0.05 and r = -0.93 for GPP and r = -0.88 for evapotranspiration. Based on the magnitude of the correlation coefficient, diffuse radiation with GPP has a closer relationship than evapotranspiration.

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“…Limited access to reliable electricity grids and transmission networks [3] hinders the widespread adoption of clean energy solutions. There is a need for capacity building [4] and knowledge transfer [5] to empower local communities and governments to effectively implement and maintain these technologies.…”

Section: Introductionmentioning

confidence: 99%

Exploring Cutting-Edge Approaches to Reduce Africa's Carbon Footprint through Innovative Technology Dissemination

Nwokolo,

Eyime,

Obiwulu

et al. 2024

Tr Ren Energy

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This paper investigates the possibility of revolutionizing Africa's carbon footprint through innovative technology dissemination strategies for GHG emission reduction. It highlights the importance of harnessing renewable energy sources to mitigate climate change and promote sustainable development in Africa. This paper also examined several technology diffusion theories in order to unleash Africa's climate-smart potential by tying them to the recommended techniques for dealing with technological diffusion concerns. These theories varied from diffusion of innovation theory to planned behaviour theory. By analysing these theories, it was found that the most appropriate technology diffusion theory for the assessment of innovative technology dissemination strategies for GHG emission reduction in Africa would be the Diffusion of Innovations Theory. This is due to the theory's emphasis on the dissemination and adoption of new ideas, technologies, or innovations by people or groups within a social system. It would give useful insights into the variables influencing the adoption and dissemination of novel technology for reducing GHG emissions in Africa. The paper also discusses the challenges and barriers faced in the diffusion of renewable energy technologies across the continent while proposing innovative strategies to overcome these obstacles and unlock Africa's untapped climate-smart potential. These strategies include promoting policy and regulatory frameworks that incentivize investment in renewable energy, fostering partnerships between governments, private sector entities, and international organizations to support technology transfer and capacity building, and implementing financial mechanisms such as green bonds and carbon pricing to mobilize funding for renewable energy projects. These proposed strategies were also used to develop seven policies required for innovative technology dissemination strategies for GHG emission reduction in Africa. These policies aim to address the unique challenges faced by African countries in adopting and implementing innovative technologies for GHG emission reduction. By focusing on capacity building, financial incentives, and knowledge sharing, these strategies seek to promote the widespread adoption of sustainable technologies across the continent. They emphasize the importance of collaboration between governments, private sector entities, and international organizations to ensure the successful implementation and long-term sustainability of these policies.

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A review of regression models employed for predicting diffuse solar radiation in North-Western Africa

Cited by 13 publications

References 49 publications

Assessing the Impact of Soiling, Tilt Angle, and Solar Radiation on the Performance of Solar PV Systems

Assessing the Impact of Soiling, Tilt Angle, and Solar Radiation on the Performance of Solar PV Systems

Increasing smog haze and its impact on oil palm evapotranspiration and gross primary production during the 2015 fire: special discussion on diffuse radiation

Exploring Cutting-Edge Approaches to Reduce Africa's Carbon Footprint through Innovative Technology Dissemination

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