Papers by Najib Hamisu Umar
Performance and degradation analysis of fielded photovoltaic module
INFLIBNET, 2019
Performance and economic viability of the PV system in different climatic zones of Nigeria
Sustainable Energy Technologies and Assessments
Power degradation and performance analysis of 100 kW grid-connected PV solar systems in Nigeria
EnergyRN: Photovoltaics (Topic), 2019
In this paper, the effects of the hot-spotted cell on PV module were evaluated. The experimental ... more In this paper, the effects of the hot-spotted cell on PV module were evaluated. The experimental observation was based on 100 kW PV array composed of 20 PV modules. It was found that an increasing number of hot-spotted solar cells in a PV module would likely increase its output power loss. It was also noticed that most of the PV modules affected by hot-spotted PV string are relatively affected by high-temperature levels, dust, and Partial shading due to trees or tall vegetation. Furthermore, the average performance ratio (PR) and degradation rate (DR) of all examined PV modules were analyzed. PR was observed to have a higher value of 0.78 in a non-hot-spotted PV array, whereas low PR of 0.65 was observed in a hot-spotted PV array. High DR of 3.13/year was observed in hot-spotted PV array; while low DR of 1.48/year was found in a module with no hot-spot. It was evident that the mean PR is significantly reduced due to the existence of hot-spots in the PV modules. DR was also increased...
International Journal of Engineering Science Invention (IJESI, 2018
Several simulation softwares have been developed to simulate and optimize photovoltaic system. En... more Several simulation softwares have been developed to simulate and optimize photovoltaic system. Engineers and Researchers used these simulation tools for sizing of PV power plant, pre-feasibility analysis, and optimization, technical and economic analysis in order to avoid system oversize , poor reliability, and high installation cost. In this paper, 10 simulation softwares with their main features and developers of these tools are discussed, the softwares studied are SAM,
International Journal of Recent Technology and Engineering, 2019
The performance of 100 kWp roof-top grid-connected PV system was evaluated. The plant was install... more The performance of 100 kWp roof-top grid-connected PV system was evaluated. The plant was installed at PGDM building in Sharda University, Greater Noida in northern India. The plant was monitored from March 2018 to February 2019. Performance parameters such as system efficiency, performance ratio, capacity utilization factor, and degradation rate were obtained. The plant performance result was compared with the estimated results obtained from SAM and PVsyst software. The total annual energy output was found to be 16426 kWh. The annual average system efficiency and capacity utilization factor of the plant was found to be 15.62 % and 14.72 % respectively. The annual performance ratio and annual degradation rate were found to be 76% and 1.28%/year respectively. The annual performance ratio obtained from SAM and PVsyst was found to be 78% and 82% respectively. It was noticed that the measured performance ratio was highly relative with the one obtained from SAM software.
Single or no transmission line network connected to the power grid is the major characteristics o... more Single or no transmission line network connected to the power grid is the major characteristics of rural area power supply; resulting in unreliable and unsecured power supply. While in villages or islands that are off-grid, stand-alone systems are the alternatives energy generation procedure used. Recent penetration of renewables into the power generation has enable its application in both urban and rural areas in order to minimise cost, and make the system more reliable and secured. Thus, integrated wind-diesel hybrid power system with pumped storage system in a remote island of Jazirat Masirah in Oman would be of high benefits. Different wind-diesel hybrid systems were designed and analysed using HOMER software, in a bid to find a better and lasting solutions to the power problem of the island while considering the economic and technical benefits. It was found that, a hybrid system comprising of two E-48 wind turbines, one diesel generator set and one pumped hydro storage can meet...
International Journal of Engineering and Advanced Technology
In this paper, the effect of module discoloration on electrical parameters degradation was analyz... more In this paper, the effect of module discoloration on electrical parameters degradation was analyzed. The discoloration was initially identified through visual inspection method. The visual image shows that the module has changed color to brown, and there is no discoloration on the module metallization. Furthermore, the module discoloration was correlated with the electrical parameters degradation. The analysis shows that Isc and Pmax have degraded high. This indicates that discoloration defect has correlated well with Isc and Pmax degradation. The annual power degradation rate of module 1 and 2 are found to be 2.25/year and 1.56/year respectively.
PV module performance can be significantly affected by both environmental conditions, such as out... more PV module performance can be significantly affected by both environmental conditions, such as outside temperature, wind velocity, and humidity, as well as the accumulation of dust on the module surfaces. Climatic factors can also influence the amount of dust accumulation directly. In this paper, the effect of longterm soiling on the PV module performance for one year of outdoor exposure in a Tropical Savanna climate and the influence of manual cleaning method was investigated. It was observed that a manual cleaning was effective at improving the output of the PV module. However, overall improvements in Pmax after cleaning ranged from 3.5% to 19.4%, with an average value of 9.8% and an average improvement in Isc of 6.7% were obtained.
International Journal of Science and Research (IJSR), 2021
The software industry's competitive nature makes it natural that software managers and developers... more The software industry's competitive nature makes it natural that software managers and developers face several crucial decisions in managing the software project. These decisions are taken to enhance processes maturity and product quality with improved planning accuracy and monitoring control. In this study, the factors determining the growth of software project management were analyzed. This study used an online survey to collect the necessary data relating to the development, classification, consideration, priority setting, and preparation in software projects. It was observed that team incapability, time constraint, limited testing criteria, customer's inability to understand quality specifications, Budget limitation, limited ability to handle quality requirements, and lack of customer involvement are the major constraints in software project development. The analysis indicates that quality criteria, performance, security, usability, team capability, and customer involvement gained more consideration in the context of software development. Finally, it was recommended that project managers and developers should learn how essential it is to delegate specific roles to avoid difficulties resulting from a lack of clear accountability for the required specifications in the production of software.
International Journal of Advanced Research in Science and Engineering, 2015
Information Technology plays a vital role in the development of the economy of any nation as its ... more Information Technology plays a vital role in the development of the economy of any nation as its impacts is brought to bear on the many facets of the economy. On the average, about 75% of hardware and software facilities available in Nigeria are in optimum use and this has increased the efficiency in service and product delivery by some 78.8% [Chidi E. Akujor1 Advances in Science and Technology, Vol. 4, No. 2,]. Based on the data used for this project, the reliability, which is the probability of Zinox laptop computers performing its required function under stated conditions for a stated period of time, was found to be 0.9998. This shows that the products are very reliable. the mean time between failures was found to be 12.44 years; which shows that, the system would survive for a period of 12.44 years before it fail. And the reliability of Zinox laptop computers was found to be 0.9998; which shows that they are a very reliable products
Faults can be defined as the flow of a massive current through an improper path which could cause... more Faults can be defined as the flow of a massive current through an improper path which could cause enormous equipment damage which will lead to interruption of power, personal injury, or death. In addition, the voltage level will alternate which can affect the equipment insulation in case of an increase or could cause a failure of equipment start-up if the voltage is below a minimum level. As a result, the electrical potential difference of the system neutral will increase. During normal operating conditions, current will flow through all elements of the electrical power system within predesigned values which are appropriate to these elements' ratings. Any power system can be analysed by calculating the system voltages & currents under normal & abnormal scenarios.
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Papers by Najib Hamisu Umar