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Benchmark assessment of performance indices of a selection of hybrid nanofluids in a hybrid photovoltaic/thermal system

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Clean Energy 2022年第2期6卷 247-270页

作者： o.M.Amoo r.o.fagbenle M.o.oyewola Department of Mechanical Engineering University of IbadanIbadanOyo StateNigeria School of Mechanical Engineering Fiji National UniversityFiji

This research is a study assessing the performance of hybrid nanofluids in hybrid photovoltaic(PV)-thermal *** study addresses 10 hybrid nanofluids applied to hybrid PV-thermal *** transition to carbon-free energy can mitigate the worst effects of climate change,ensuring that global sustainability is *** energy is now responsible for one-third of the global capacity,of which 20%is attributed to solar *** continue to be economically viable,with declining costs driving *** study aims to compare the yearly performances of a model hybrid PV-thermal system using 10 different hybrid *** nanofluids constitute two or more dissimilar materials stably suspended in a base fluid(***).MATLAB and CoMSoL Multiphysics®computational fluid dynamics software are employed together for the benchmarking assessment with good agreement *** fluid inlet temperatures(Tin∈[300,360]K),nanofluid volume concentrations(φ∈[0,4]%)and storage-tank volumes(V∈[50,300]L)were *** meteorological data applied were those for Lagos,Nigeria(6°27’55.5192”N,3°24’23.2128”E).The assessment based on analytical-numerical solutions reveals that the thermal enhancement by hybrid nanofluids ranges from 6.7%(graphene oxide[Go]-multiwalled carbon nanotube[MWCNT]/water)to 7%(Zno-Mn-ZnFe2o4/water)forφ=2%and V=300 *** yearly exergy efficiency ranges from 2.8%(Zno-Mn-ZnFe2o4/water)to 2.9%(Go-MWCNT/water),also forφ=2%and V=300 *** findings have implications for a vast range of industrial processes,expanding the knowledge that is critical to a sustainable future.

关键词： energy transformation hybrid photovoltaic-thermal(PV/T)system hybrid nanofluids CoMSoL Multiphysics® MATLAB enhancements

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Correlations for estimating solar radiation using sunshine hours and temperature measurement in osogbo, osun State, Nigeria

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Frontiers in Energy 2013年第2期7卷 214-222页

作者： o. S. oHUNAKIN M. S. ADArAMoLA o. M. oYEWoLA r. o. fagbenle Mechanical Engineering Department Covenant University Ota 11001Ogun State Nigeria Department of Energy and Process Engineering Norwegian Universityof Science and Technology Trondheim N-7491 Norway Department of Mechanical Engineering University of Ibadan lbadan200284 Nigeria Department of Mechanical Engineering Obafemi Awolowo UniversityIle-Ife 220005 Osun State Nigeria

In this study, the global solar radiation on horizontal surface in osogbo, osun state, Nigeria was analyzed using ll-year data （1997-2007）. Correlations using linear and quadratic expressions were developed to relate the global solar radiation on horizontal surface based on relative sunshine hours and temperature measurements for evaluating the monthly average daily global solar radiation. The calculated monthly clearness index values indicate that the prevailing weather condition in osogbo is heavily overcast. All the developed quadratic correlations gave better correlation coefficients （0.834, 0.872 and 0.823 respectively） than the linear models. However, the Hargreaves and Samani related based quadratic model gave the best among the three developed quadratic expressions and is therefore suggested for estimating the monthly global radiation in this site and its surroundings.

关键词： global solar radiation Hargreaves model sunshine hour ambient temperatures osogbo

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overview of Energy and Environmental Issues in the Passenger Automobile Industry

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Journal of Transportation Technologies 2011年第4期1卷 67-82页

作者： olaleye Michael Amoo r. Layi fagbenle 不详

The global supplies of petroleum are on the decline and the dwindling resource has become increasingly difficult to access. Improved technology is increasingly been required to access petroleum that is in hard to reach geographical environments and has chemical composition that is not entirely compatible with existing processing techniques. Alternative energy involves energy from renewable and non-depleting sources such as wind and solar, offer many opportunities for research and development and are been widely developed globally. These sources of energy are expected to reduce the threat of a changing climate, air pollution and oil dependence caused by the automobile industry. There are many economic, environmental and societal benefits of employing various alternative energy sources or options in the passenger automobile industry for motive power. Transitioning from a monoculture of hydrocarbon-based transportation will be just as signify- cant as investments in research and development needed to develop a portfolio of cost-competitive and safe alternative powertrain technologies that can effectively retire the fossil fueled internal combustion engine, without much of any economic stress. In this work, we couple energy and environmental issues to obtain a realistic indication of the future of alternative powertrain technologies for the future of the passenger automobile industry.

关键词： Energy Alternative Energy Environment Efficiency Automobile Industry Vehicles

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Forced Convection Thermal Boundary Layer Transfer for Non-Isothermal Surfaces Using the Modified Merk Series

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open Journal of Fluid Dynamics 2014年第2期4卷 241-250页

作者： Ayodeji Falana richard olayiwola fagbenle Department of Mechanical Engineering University of Ibadan Ibadan Nigeria

The Chao and fagbenle’s modification of Merk series has been employed for the analysis of forced convection laminar thermal boundary layer transfer for non-isothermal surfaces. In addition to the Prandtl number (Pr) and the pressure gradient (∧), a third parameter (temperature parameter, γ?) was introduced in the analysis. Solutions of the resulting universal functions for the thermal boundary layer have been obtained for Pr of 0.70, 1.0 and 10.0 and for a range of ∧?. The results obtained for the similarity equations agreed with published results within very close limits for all the ∧’s investigated.

关键词： Boundary Layer Non-Isothermal Similarity Solutions Power-Law

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A Study of Implementation of Preventive Maintenance Programme in Nigeria Power Industry – Egbin Thermal Power Plant, Case Study

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Energy and Power Engineering 2011年第3期3卷 207-220页

作者： Sunday olayinka oyedepo fagbenle richard olayiwola 不详

Preventive Maintenance Programme consists of actions that improve the condition of system elements for performance optimization and aversion of unintended system failure or collapse. It involves inspection, servicing, repairing or replacing physical components of machineries, plant and equipment by following the prescribed schedule. It is commonly agreed nowadays that preventive maintenance programme can be very successful in improving equipment reliability while minimizing maintenance related costs. The availability of a complex system, such as steam turbine power plant is strongly associated with its parts reliability and maintenance policy. That policy not only has influence on the parts’ repair time but also on the parts’ reliability affecting the system integrity, degradation and availability. The objective of this paper is to study the effects of Preventive Maintenance Programme (PMP) implementation on the performance of the Egbin 1320 MW thermal power plant in Nigeria. This paper considers the reliability and availability of the 6 x 220 MW steam turbine units installed in the power station. The reliability and availability of the turbines are computed based on a five-year failure database. The availability analysis of available data from 2005 to 2009 shows different results for each unit and variation in availability for different year: availability of unit1 varies between 59.11 to 91.76%;unit 2, 64.02 to 94.53%;unit 3, 28.79 to 91.57%;unit 4, 80.31 to 92.76% and unit 5, 73.38 to 87.76%. Unit 6 was out of service for the past 2 to 3 years. This indicates differences in their systems installation maintenance and operation.

关键词： Preventive Maintenance Programme Power Plant reliability Availability Turbine

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Magnetic Field Enhancement in Ammonia-Water Absorption refrigeration Systems

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Energy and Power Engineering 2014年第4期6卷 54-68页

作者： Moradeyo K. odunfa richard o. fagbenle olanrewaju M. oyewola olayinka S. ohunakin Mechanical Engineering Department Covenant University Ota Nigeria Mechanical Engineering Department Obafemi Awolowo University Ile-Ife Nigeria Mechanical Engineering Department University of Ibadan Ibadan Nigeria

Absorption enhancement has been considered as an effective way of improving coefficient of performance (CoP) of refrigeration systems and magnetic enhancement is one of these methods. A model of magnetic field enhancement in ammonia-water absorption systems is presented in this paper. A numerical model using finite difference scheme was developed based on the conservation equations and mass transport relationship. Macroscopic magnetic field force was introduced in the momentum equation. The model was validated using data obtained from the literature. Changes in the physical properties of ammonia solution while absorbing both in the direction of falling film and across its thickness were investigated. The magnetic field was found to have some positive effect on the ammonia-water falling film absorption. The results indicate that absorption performance enhancement increased with magnetic intensity. The CoP of simple ammonia solution absorption refrigeration system increased by 1.9% and 3.6% for magnetic induction of 1.4 and 3.0 Tesla respectively.

关键词： Ammonia-Water Absorption refrigeration Magnetic Field Force Ammonia Solution Concentration Coefficient of Performance Finite Difference Scheme Numerical Solution

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A review of Performance Appraisals of Nigerian Federal Government-owned refineries

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Energy and Power Engineering 2012年第1期4卷 47-52页

作者： Ismaila Badmus Miracle olanrewaju oyewola richard olayiwola fagbenle 不详

The aim of this paper is to review previous works on the performance appraisal of Nigerian government-owned refineries. The review has been done in a general sense, covering appraisal works by engineers, scientists, management experts, economists, sociologists and even historians. The outcome indicates that while there seems to be several works directly and/or indirectly assessing the performance of the refineries in a general sense, there is a dearth of such in the specific area of energy consumption. There also appears to be no single one appraising energy utilisation of all the refineries at the same time in the open literature. This is in spite of the fact that refining processes are energy intensive. Despite popularisation of exergy analysis as a veritable tool, the only energy utilisation appraisal within our reach which was carried out on just one of the refineries has not been done exergetically. However, the work still reveals, within the limitations of 1st Law energy analysis that the energy consumption patterns are below international benchmarks in the oil and gas industry. Some suggestions have also been offered to take care of the energy efficiency challenges in these refineries. These include plant to plant analyses of energy utilisation patterns in the four refineries, periodical determination of GHG emission levels in the refineries using current international best practices as benchmarks, use of exergy analysis to check avoidable energy wastage in the refining processes, shifting refinery fuelling pattern in favour of low carbon content fuels like natural gas and ensuring regular turnaround maintenance of the system.

关键词： Nigerian refineries Energy Efficiency Exergy Analysis review Performance Appraisal

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