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Search Results: 1 - 10 of 246772 matches for " Emmanuel O. B. Ogedengbe "
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Optimization of Thermal and Electrical Appliance Loads in Residential and Commercial Buildings with Demand Side Monitoring  [PDF]
Emmanuel O. B. Ogedengbe
Smart Grid and Renewable Energy (SGRE) , 2013, DOI: 10.4236/sgre.2013.47A003

Energy demand-supply mechanism with the load shape for both residential and commercial buildings in the Province of Ontario and Nigeria is studied with demand side monitoring of energy consumption. Thermal and electrical loads are characterized by certain predictor variables, including the consumers’ behavioural pattern, power ratings of energy appliances and weather conditions. The proposed bottom-up approach is capable of providing low-volume electricity and natural gas consumers, in a fully deregulated energy market, with competitive energy saving advantage, based on corrective monitoring of independent users’ demand loads. Special application of the bottom-up model-based facility characterization of demands for thermal comfort and indoor air qualityin a developing energy sector like Nigeria enables the development of planning tool for the proposed integration of renewable power systems. The developed DSMonitorTM app is capable of deploying an effective smart grid technology tool towards an improved building energy demand-supply balance at the individual end-user level.

Electro-Kinetic Pumping with Slip Irreversibility in Heat Exchange of CSP-Powered Bio-Digester Assemblies
Emmanuel O.B. Ogedengbe,Marc A. Rosen
Entropy , 2012, DOI: 10.3390/e14122439
Abstract: Parametric studies of the effects of slip irreversibility in concentrating solar power (CSP)-powered bio-digester assemblies are investigated. Complexities regarding the identification of the appropriate electro-kinetic phenomena for certain electrolyte phases are reviewed. The application of exergy analysis to the design of energy conversion devices, like solar thermal collectors, for the required heat of formation in a downdraft waste food bio-digester, is discussed. Thermal management in the silicon-based substrate of the energy system is analyzed. The rectangular-shaped micro-channels are simulated with a finite-volume, staggered coupling of the pressure-velocity fields. Entropy generation transport within the energy system is determined and coupled with the solution procedure. Consequently, the effects of channel size perturbation, Reynolds number, and pressure ratios on the thermal performance and exergy destruction are presented. A comparative analysis of the axial heat conduction for thermal management in energy conversion devices is proposed.
Thermal Management with Solid-Fluid Slip Irreversibility Treatment in Conjugate Microdevices
E. O. B. Ogedengbe
Journal of Thermodynamics , 2009, DOI: 10.1155/2009/176495
Abstract: A numerical study of the effect of slip flow irreversibility and axial conduction in microdevices with a conjugate heat transfer between unmixed streams is presented. The effects of axial conduction due to parallel flows for thermal management in energy systems are investigated. Silicon substrate containing rectangular microchannels is simulated using a finite volume, staggered coupling of the pressure-velocity fields. The entropy generation transport within the entire system is analyzed and coupled with the solution procedure. The effects of channel size perturbation, Reynolds number, and pressure ratios on the thermal performance and exergy destruction are presented. Comparative analysis of the axial conduction and flow irreversibility between parallel flow on thermal management is studied. A proton exchange membrane (PEM) fuel cell model is used as a quality indicator to access the importance of the exergy-based design method.
Environmental Impact of Bitumen on Soil, Water and Plant in Lodasa Area, Ode-Irele, Ondo State, Nigeria
Kola Ogedengbe,Christopher O. Akinbile
Research Journal of Applied Sciences , 2012,
Abstract: Six locations of various plants with different indicator parts were analyzed with 12 soil samples, 6 plant and 6 water samples in Lodasa, Ode-Irele Local Government Area of Ondo State to study the effects of bitumen on them. Results show that the percentage composition of nitrogen the in plants ranges from 0.069-0078, for phosphors it ranges from 0.031-0.068, potassium form 0.16-0.23, calcium ranges from 0.212-0.288, for magnesium, 0.104-0.188. Percentage composition of manganese ranges from 17.07-21.03, for zinc 13.25-16.20, for copper, 1.93-2.33 and percentage iron ranges from 31.25-36.24 all in plants analyzed. As for the composition of these constituents in soils, percentage composition of nitrogen ranges from 1.058-3.61, calcium, 0.66-0.88, magnesium, 0.65-0.88 and organic matter ranges from 1.788-2.142. Evidently these show that the soils cannot support plant growth and their effects were manifested in visual signs of dying plants in the bitumen affected areas. The results for water samples have values below the standard recommended by the World Health Organization (WHO) for safe drinking water while calcium and manganese values are above the WHO Standard. As for the results of waters samples analyzed, manganese ranges from 1.63-2.94 ppm, calcium, 3.22-8.63 ppm, iron 0.28-0.43 ppm, copper 0.19-0.38 ppm while magnesium ranges from 2.85-4.77 ppm. These show that the water was toxic and injurious to human, animals and aquatic lives. Statistical analysis shows a positive linear correlation between the presence of nutrients in plants and the soil, which is responsible for the retarded growth and yellow colouration of the leaves. The presence of bitumen in Lodasa soil is fast eroding soil fertility in the area and has contributed immensely to low yield of agricultural products. The use of organic fertilizer to boost soil fertility, relocation and resettlement of farmers to areas with high soil fertility and appropriate legislation to protect the rights of the native settlers are some of the recommendations.
Performance Evaluation of Solar Radiation as Alternative Disinfection Technique for Well Waters in Ibadan, Nigeria
Kola Ogedengbe,Christopher O. Akinbile
Journal of Engineering and Applied Sciences , 2012,
Abstract: A solar radiation technique was used as a means of disinfection for well waters in parts of Ibadan comprising 8 zones. The zones are Idi-arere, Oke-odo, Oja ba, Labo, Kudeti, Kobomoje, Bode and Molete. Structured questionnaires were administered to the dwellers of randomly selected houses in the area with (40) shallow-hand dug wells under the zones resulting into 120 respondents, mostly women to obtain baseline information on their general attitude to water use and the overall sanitary features of their wells. Water samples were also taken from the selected wells and analyzed to determine their physiochemical and bacteriological characteristics. A 100 % coliform count reduction was achieved for 4 and 5 L water samples in 7 L container. Seven hours or more of exposure to sunlight was found to be ideal in reducing the coliform count. The degree of disinfection was relatively higher with white (97.9%) and black (98.4%) containers when compared with brown (95%) and blue (82%) containers. With increasing turbidity, the solar radiation efficiency decreases. Ultra Violet Radiation (UVR) was discovered to be the actual disinfection agent rather than the heating effect due to temperature increase. The temperature range of between 23 and 46 C for ambient and between 25 and 45 C for water samples were found to be ideal for the exercise. The experiment provided satisfactory and viable performance when compared with the WHO standard with MPN count found to be 7.2 per 100 mL for 7 h of exposure compared to 2478 per 100 mL before the solar disinfection exercise. Solar disinfection in a tropical country like Nigeria is affordable and can be used by people irrespective of their educational background. This will also reduce the rate of infections and deaths as a result of water related infections especially in this part of the world.
On the Dynamics of Advance Wetting Front in Furrow Irrigation in Nigeria
Christopher O. Akinbile,Kola Ogedengbe
Agricultural Journal , 2013,
Abstract: Two models, Davis and Fok and Bishop were explored to determine their furrow advance prediction accuracy in comparison with actual field observation in Nigeria. An expression that relates the intake rate with accumulated intake time using Kostiakov-lewis equation for field observation was found to be Y = 0.71t 0.76 Correlation coefficients between actual field observation and Davis model ranged from 0.99 to 0.81 and from 0.85 to 0.98 for Fok and Bishop model which indicated that the latter is more applicable as the stream size increases. Their generally high coefficient values indicated their usefulness in prediction. The field data analyzed and fitted by least square method of curve fitting to yield equation of the type X = a(t)b for a given irrigation condition. The equations relating the advance length and time at discharge (Q) 1.2 litres/sec and 0.6% slope are X = 4.8t 0.3 (Davis), X = 2.6 t0.57 (Fok and Bishop) and X = 2.5t0.55 (field observation) while at discharge (Q) 2 litres / sec and the same slope, X = 6.2t0.45 (Davis), X = 3.2t0.59 (Fok and Bishop) and X = 3.0t0.56 (field observation). Fok and Bishop model thus affords a more accurate prediction of the advance wetting front, having the least deviation within the context of this study.
Performance Evaluation of Bamboo-pipe (Bambusa vulgaris, Schrad) and Medi-emitter in a Gravity-flow Drip Irrigation System
Awe, G. O.,Ogedengbe, K.
Journal of Environmental Issues and Agriculture in Developing Countries , 2010,
Abstract: The use of bamboo (Bambusa vulgaris, Schrad) in gravity - flow drip irrigation was evaluated at the Teaching and Research Farm, University of Ado Ekiti, Nigeria with leaf amaranth (Amaranthus cruentus) as test crop. The system involved the use of bamboo as the conveyance structure and medical infusion sets as dripper to deliver water to the field at 10, 15, 20, 25 and 30 drops of water/minutes. The variation in discharge ranged from 6.35 to 10.21 percent as the flow rate decreases from 30 to 10 drops of water/minute. The study revealed that there was an increase in plant height on average of four weeks after sowing while an optimum yield of 4.13Kg/m2 was recorded from 15 drops of water/minute. This is a new dimension in affordable drip irrigation technology and an avenue to exploit local and cheap materials whose propagation should be emphasized.
Gold grade variation and stream sediment geochemistry of the Vaimba-Lidi drainage system, northern Cameroon (West Africa)  [PDF]
Victor F. Embui, Benjamin O. Omang, Vivian B. Che, Melvin T. Nforba, Emmanuel C. Suh
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.52A040

Stream sediment geochemistry remains a versatile tool in exploration especially in regions where knowledge of the primary mineralization is lacking and the exploration activities are still at reconnaissance stage. In this study, we investigate the concentrations of gold and associated elements in stream sediment samples from the Vaimba-Lidi drainage system in northern Cameroon; a relatively remote area where alluvial gold is worked locally, and exploration activities are at early stage. The main river and its principal first and second order tributaries were sampled, panned for gold grain recovery and the 100 μm size fraction analyzed for Au by fire assay with Ni finish. A suite of other elements were analyzed for by inductively coupled plasma mass spectrometry (ICP-MS). Gold grades estimated by the panning and weighing technique rarely exceed1 g/t while the Au concentrations from chemical analysis range from 3.0 to 354.0 ppm. The spatial distribution of gold and all the other elements are presented as point symbol maps and the data analyzed using multivariate statistics. From the principal component analysis (PCA), the As-Mo-W-Ag as well as the Au-Zn factors point to the presence of primary hydrothermal gold-sulphide mineralization in the area and this can be further investigated. These results highlight the importance of multielement analysis and multivariate statistical interpretation of sediment geochemical data in inferring the nature of the underlying primary mineralization in any region.

Trends of Temperature and Signature of Solar Activity in Selected Stations in Nigeria  [PDF]
Christiana F. Olusegun, Akeem B. Rabiu, Jared O. H. Ndeda, Emmanuel C. Okogbue
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.42020

This study investigates the variability and periodicity of minimum temperature, maximum temperature and sunspot number—a solar activity index in selected synoptic stations across Nigeria from 1946 to 2010. Annual and semiannual effect of solar activity on minimum temperature was observed in all the six stations. This was indicated in the occurrence of modal periodicities of 6-month and 12-month observed across the six synoptic stations. The synoptic stations are Sokoto (13.01°N, 5.15°E), Ilorin (8.29°N, 4.35°E), Ikeja (6.35°N, 3.20°E), Enugu (6.28°N, 7.33°E), Port-Harcourt (4.51°N, 7.01°E) and Maiduguri (11.51°N, 13.05°E). Similarly, the trends of inter-decadal va-riability of minimum and maximum temperature show a non-uniformity increase over the analyzed period with a slight decrease before 1960. The long term behavior of minimum and maximum temperature shows a warming rate which ranges from 0.1°C/decade to 0.2°C/ decade across the six stations except for maximum temperature at Ilorin and minimum temperature at Sokoto which is at -0.2°C/decade and 0.3°C/decade respectively.

Synthesis and Characterization of Pure and Ag-TiO2-Modified Diatomaceous Aluminosilicate Ceramic Membranes for Water Remediation  [PDF]
Emmanuel Ajenifuja, John Adegbindin Ajao, Samson Oluwagbemiga Alayande, Mufutau Kolawole Bakare, Bidini Alade Taleatu, Ezekiel O. B. Ajayi
Journal of Water Resource and Protection (JWARP) , 2016, DOI: 10.4236/jwarp.2016.85049
Abstract: Mesoporous ceramic membranes were prepared from raw and modified diatomaceous earth alumi-nosilicate mineral precursors. The main modification component of the ceramic membranes was Ag-loaded TiO2 nanoparticles (STOX). Chemical and microstructural characterizations of the raw materials and the modified precursors were carried out using Fourier Transform Infrared (FTIR) Spectroscopy, Particle Induced X-ray Emission (PIXE-IBA), Energy Dispersive X-ray Spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The precursors and membranes were prepared and subsequently subjected to a high temperature sintering treatment for physico-chemical modification and stability. Remediation functionalities of the ceramic membranes on water samples were studied using Atomic Absorption Spectrophotometry (AAS), Total Bacterial Count Enumeration; Total Dissolved Solids (TDS), pH, and Electroconductivity (EC). Remediation experiments showed reductions in the concentration of certain cations such as Mg2+, Mn2+, Cd2+, Ni2+ and K+ by the modified ceramic membrane samples, while increased concentrations were observed for Ca2+, Na+ and Mg2+. The antimicrobial microfiltration process showed 100% bacterial removal and 70% fungi removal in most of the samples. Membranes exhibited good flux output from 5.607 L/hr·m2 (STOX-Z) to 39.245 L/hr·m2 (ZEO-T) under a pressure of 0.0196 MPa.
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