Ogheneruona Diemuodeke

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• Doctor of Philosophy
• Professor (Full) at University of Port Harcourt

Investigation of the liquid fuel jet breakup during the transient operations and in combustor environment, in which the liquid fuel is injected, is crucial to the understanding of the overall aspects of jet breakup and droplet size distribution. A new analytical hydrodynamic instability and breakup model is presented. The analytical model investiga...

The utilisation of high-injection-pressure fuel system in direct diesel injection requires liquid fuel being injected at a very high pressure, which is later converted to a corresponding high velocity by the injector nozzle, which gives rise to a turbulent flow fields around droplets. The fate of a droplet that travels through ambient depends on th...

The theory of liquid jet instabilities has been developed under several assumptions, which include the assumption that the jets breakup processes are quasi-steady and isothermal. Accelerated liquid fuels are normally injected into an elevated combustion-chamber temperature to maintain a desirable homogeneous combustible mixture – liquid vapour and...

Optimum configuration, using a hybrid optimisation model for electric renewable software, and design of a photovoltaic (PV)–diesel–battery hybrid energy system has been proposed to power a facility in the University of Port Harcourt, which is located in the suburb of Port Harcourt city, Nigeria. The configuration of the optimum hybrid system is sel...

The theory of liquid fuel jet instabilities has been developed under several assumptions, which include the assumption that the jets breakup processes are isothermal. However, liquid fuels are normally injected into an elevated combustion-chamber temperature to maintain a desirable homogeneous combustible mixture - liquid vapour and air. Therefore,...

Electricity demand forecasting has emerged as a critical area of research in recent times, driven by the necessity for accurate predictions of future load requirements. Such predictions are essential for effectively operating and planning electric power systems. Various forecasting methodologies and approaches have been employed to estimate electri...

Decarbonizing road transport is crucial for global climate goals, especially in developing countries with rising motorization. This study assesses the economic cost and lifecycle greenhouse gas (GHG) emissions of low-carbon passenger transport in Africa. Using Monte Carlo and optimization models, we compare the total cost of ownership and lifecycle...

This study explores the integration of sustainable wind power into Nigeria's energy system, focusing on its effects on Excess Electricity Production (CEEP), CO2emissions reduction, and fuel demand under different scenarios. Using the Energy PLAN modeling tool, the study evaluates Nigeria's energy infrastructure at an electricity demand of 32 TWh pe...

The integration of renewable energy sources, such as photovoltaic (PV) and wind turbines, has gained significant attention due to the growing demand for reliable and clean energy solutions. This paper presents a comprehensive modelling and optimization approach for hybrid PV and wind turbine systems to maximize system performance at the same time m...

Citation: Diemuodeke, O.E.; Vera, D.; Ojapah, M.M.; Nwachukwu, C.O.; Nwosu, H.U.; Aikhuele, D.O.; Ofodu, J.C.; Seidu Nuhu, B. Hybrid Solar PV-Agro-Waste-Driven Combined Heat and Power Energy System as Feasible Energy Source for Schools in Sub-Saharan Africa. Abstract: Poor access to electricity in rural communities has been linked to a poor educati...

This paper describes the study of a floating offshore wind turbine (FOWT) blade in terms of its dynamic response due to structural damage and its repercussions on structural health monitoring (SHM) systems. Using a finite element model, natural frequencies and mode shapes were derived for both an undamaged and a damaged blade configuration. A 35% r...

Fermented cassava roasting is an energy-intensive process that is commonly used to produce gari, a popular food in Nigeria made from cassava. Traditional roasting methods use firewood as an energy source, which is inefficient and harmful to the health of those who inhale the smoke (mainly women and children in rural communities) and contributes to...

The deployment of hybrid renewable energy systems remains the quickest way to salvage the dwindling grid supply in Nigeria and improve energy access. The assessment of biomass and hydro potentials across the geopolitical zones of the country to determine the optimal locations for a Biogas fired thermal plant for energy generation is thoroughly addr...

The global energy narrative is pushing for the deep decarbonisation of energy-consuming systems. This paper seeks to assess cassava (a staple food in West Africa) production potentials in Nigeria and to technically evaluate the garri production process as well as to study the effect of storage duration on the quality of the garri. Available data in...

Solar mini-grids are a cost-effective and efficient method of improving energy access in sub-Saharan Africa, particularly in low-income communities. However, conventional battery storage systems have reduced the affordability of solar mini-grid-generated electricity, necessitating the development of alternative energy storage systems such as pumped...

This paper introduced the concept of relative fractional area (FA) for comparison of materials for thermal retentivity. This concept was used as a criterion in selecting the best heat retention materials among sand, gravel, salt, red clay, kaolin and bentonite. The fractional areas for the materials were computed from experimental data obtained und...

In a bid to promote clean energy usage and conserve the forests, the Nigerian bio-energy policy was recently constituted, to help tackle the energy insecurity in the country and help increase its carbon credit in line with the United Nations development goals. This paper presents a Geographical Information System (GIS)-based assessment of biomass e...

The understanding of the geographical variability of biomass energy is an essential requirement for the optimal location of biomass energy conversion plants. This research presents a multicriteria GIS-based assessment of biomass energy potentials and the appropriate siting of biomass plants in Nigeria. The study applies the weighted overlay multicr...

Biodiesel, with the potential to reduce emissions, is an attractive source of renewable energy in the transportation sector, which supports blending of diverse sources such as soybean oil, coconut oil, groundnut oil, palm oil and waste cooking oil. This study presents an analysis of using positive valve overlap of 32 degrees on the performance and...

In pursuit of net-zero greenhouse gases emissions goals, Nigeria faces challenges like fossil fuel dependence, environmental degradation and energy inefficiency, necessitating a transition to decarbonization. This study employs the Bass model and TOPSIS multi-criteria analysis to investigate the diffusion and ranking of low/zero-carbon technologies...

The geographical variability of biomass energy is an issue that requires the optima location of biomass energy facility. This paper presents a multicriteria GIS-based assessment of biomass energy potentials and appropriate siting of biomass plant in Nigeria. The study applies the weighted overlay multicriteria decision analysis method. Crop, and fo...

An experimental study on the optimal gas turbine inlet air filtration system performance for offshore applications is presented. The objective is to conduct a comparative real-time data analysis for an offshore selection of optimal filtration system. Different filtration configurations were set up in a wind tunnel under simulated offshore environme...

This paper focuses on the prospects of small hydropower plants (SHP) in Nigeria and utilizes ArcGIS software for analyzing the country's hydropower energy potential. The analysis conducted using ArcGIS reveals the significant SHP potential in various states across Nigeria. By overlaying water areas and waterline data on maps, potential sites for SH...

The buildings sector is responsible for over 36% of total global end-use energy utilization and nearly 40% of the total indirect and direct carbon emissions. Low-carbon or zero-energy buildings remain the only option to lessen the sector’s energy consumption and CO2 emissions. The current systematic study examines low-carbon buildings under deep de...

The Federal Government of Nigeria (FGN) has committed to net-zero emission development pathways to respond to the Paris Agreement adopted in 2015. However, the country is in dire need of energy to support its developmental ambitions. Therefore, it is necessary to consider green energy technologies to support both socioeconomic development and to me...

This paper focuses on the prospects of small hydropower plants (SHP) in Nigeria and utilizes ArcGIS software for analysing the country's hydropower energy potential. The analysis conducted using ArcGIS reveals the significant SHP potential in various states across Nigeria. By overlaying water areas and waterline data on maps, potential sites for SH...

Gari roasting is an energy-intensive process that is commonly used to produce gari, a popular food in Nigeria made from cassava. Traditional gari roasting methods use firewood as an energy source, which is not only inefficient but also harmful to the health of those who inhale the smoke (who are mainly women and children in rural communities) and c...

With their higher sustainability index, biofuels, environmentally-friendly and renewable nature is a viable alternative energy source in the transportation sector. This study presents the effect of waste cooking oil (WCO) biodiesel on performance, combustion, and emission from a compression ignition engine. The biodiesel was blended with diesel in...

Increasing global environmental issues and depleting fossil fuel reserves has necessitated the need for alternative and sustainable fuel. In this paper, the effects of biodiesel and its blend on engine emission and performance characteristics in an internal combustion engine were analyzed. Biodiesel derived from the transesterification of raw palm...

The performance indicators of Brayton cycle configurations (BCY) for the topping cycle application are presented. The indicators include exergy efficiency, ecological efficiency, sustainability index, environmental impact, and economic parameters. The study's objective is to access the key indicators of sustainability and investment cost to provide...

The quest to decarbonize the energy space to avert the negative climate change consequences calls for using low/zero-carbon energy conversion technologies in the energy generation space. The Organic Rankine Cycle is a low/zero-carbon energy conversion technology for recovering waste heat from low to medium-temperature heat sources and for biomass c...

Greenhouse gases (GHG) emanating from agriculture, forestry, and other land use (AFOLU) sector are among top contributors to anthropogenic climate change in Africa and globally. Minimizing AFOLU sector GHG emissions in Africa is notoriously hard because of difficulties in emission estimation, the disperse nature of AFOLU emissions, and the complex...

Energy is a vital component of Nigeria’s socio-economic development. However, the supply of clean energy in the country has been a great challenge, especially in driving the Sustainable Development Goals, SDG-7 and SDG- 13, affordable & clean-energy, and climate action, respectively. Meanwhile, several studies have shown that the country is appro...

This Working Group III contribution to the IPCC Sixth Assessment Report provides a comprehensive and transparent assessment of the literature on climate change mitigation. The report assesses progress in climate change mitigation options for reducing emissions and enhancing sinks. With greenhouse gas emissions at the highest levels in human history...

Currently, over 1.5 billion people, especially in the Global South, live without access to modern energy for household uses, especially for cooking. Therefore, this study examines the cooking space of the Global South with a specific focus on the rural communities to map alternative energy sources, technologies and supporting policies to drive clea...

Aligning development and climate goals means Africa’s energy systems will be based on clean energy technologies in the long term, but pathways to get there are uncertain and variable across countries. Although current debates about natural gas and renewables in Africa are heated, they largely ignore the substantial context specificity of the starti...

Waste management is a global issue facing all the economies of the world. It is estimated that 2 billion tonnes of agricultural waste is generated annually, with organic waste making up to 80% of this amount. Waste generation and its mismanagement come with severe consequences such as flooding, climate change, poor health, lost productivity, and da...

Decarbonising the transport sector in the Global South presents an opportunity to contribute towards achieving net-zero by mid-century. Several studies have modelled different pathways to decarbonise the transport system, but the consensus is unclear due to the heterogeneous nature of transport technologies, infrastructure, locations, and consumers...

Global concerns over increasing carbon emissions, climate change, decreasing environmental quality, limited and uneven endowments of fossil fuels, rising energy demand, and volatile oil prices have inspired the move toward global energy system decarbonization. The challenges of achieving ambitious climate targets and sustainable development cannot...

This paper presents a multi-criteria optimization of integrated power systems. Five power configurations that combines the solid oxide fuel cell (SOFC), gas turbine cycle (GTC), steam turbine cycle (STC), organic Rankine cycle (ORC), absorption refrigeration cycle (ARC), and carbon capture and sequestration (CCS) as SOFC-GTC, SOFC-GT-STC, SOFC-GT-S...

In addition to zero-carbon generation, the plummeting cost of renewable energy sources (RES) is enabling the increased use of distributed-generation sources. Although the RES appear to be a cheaper source of energy, without the appropriate design of the RES with a true understanding of the nature of the load, they can be an unreliable and expensive...

Climate change is changing global weather patterns, with an increase in droughts expected to impact crop yields due to water scarcity. Crops can be provided with water via underground pumping systems to mitigate water shortages. However, the energy required to pump water tends to be expensive and hazardous to the environment. This paper explores di...

The paper presents the environmental sustainability of the Nigeria transport sector (NTPS) through the decomposition and decoupling analysis from 1988-2019. The study's objective is to determine ways of saving energy in the NTPS and reduce carbon emission for a sustainable environment. The approach was based on the Logarithmic Mean Divisa Index (LM...

This paper investigates four energy demand scenarios for the Nigerian household sector. The scenarios were formulated largely on subsisting energy policy document, and include: (i) Business as Usual (BaU), (ii) Improved Access to Modern Fuel for Cooking (MFC), (iii) Efficient Energy Use (EEU); and (iv) Transformative (TS) Scenarios. The scenarios w...

The thermo-economic and environmental analysis of an integrated power system with carbon capture and storage was investigated. The plant comprises solid oxide fuel cell (SOFC), gas turbine (GTC), steam turbine (STC), organic Rankine (ORC), absorption refrigeration (ARC), and carbon capture and storage (CCS) technologies. The system was modelled in...

The agro-processing industries can play a critical role in the development of sustainable and clean energy systems. The lack of knowledge about the technical and economic viability of agro-waste to energy is a major barrier to the successful implementation of such energy systems in developing countries, especially sub-Saharan Africa countries. This...

The paper presents the comparative evaluation of the homogenous and the drift-flux flow modelling techniques employed in a three-phase downward flow in a vertical pipe. The study's objective is to analyse and compare the pressure drop of an experimental procedure of three-phase flow in a downward vertical pipe based on the two modelling techniques....

This paper presents solar PV electric cooking systems to fill the gap of clean energy stove demand in Africa and in particular in rural communities. The design analyses of four different solar PV electric cooking configurations, based on resistive burner and induction burner, are presented. The levelised cost of energy (LCOE) of the solar PV induct...

Globally, demand for electricity has seen a steady increase, with nations striving to meet the demand. However, Nigeria is abysmally struggling to meet the increasing demand with the meagre per capita electricity consumption of 151 kWh, which is lower than the average of per capita electricity in Africa. Presently, the grid-tied electricity install...

The maintenance plan for the subsea energy supply system during the operation was optimized by firstly training the Adaptive Neuro-Fuzzy Inference System (ANFIS) model with historical data of process variables of the system such as voltage, current, power, and pressure in MATLAB software and then predicting the optimum output of the process using t...

The paper presents novel analytical droplet breakup criteria, on Weber number (We)-relative turbulence intensity and We-Ohnesorge (Oh) representations, based on the critical Weber number. The We-Oh analytical criterion stressed the importance of turbulence effects on We-Oh breakup criterion at high We-Oh applications. In developing the analytical m...

For combined-cycle power plants, the two most dominant steam condenser cooling options are the wet-cooling tower and the air-cooled (dry) systems. The wet cooling system is commonly installed on plants located in areas with available water sources, while the dry system is typically preferred in areas where water is scarce. However, owing to the inc...

Rural households represent, by far, the greater percentage of dwellings glo-bally without access to the electricity supply. For reasons of low loads, dis-tance from the grid and speed of deployment, distributed energy systems are now considered viable options for rural electrification. This paper presents the status of solar Photovoltaic (PV) in Ni...

Nigeria's Nationally Determined Contribution (NDC) shows commitment to supporting the Paris Agreement towards reducing the global warming and negative impacts of climate change. However, some gaps need to be bridged in order to make Nigeria's NDC more ambitious and effective. Therefore, this paper presents energy scenarios that could support the re...

There is a burden of adequate energy supply for meeting demand and reducing emission to avoid the average global temperature of above 2 °C of the pre-industrial era. Therefore, this study presents the exergoeconomic and environmental analysis of a proposed integrated multi-generation plant (IMP), with supplemental biomass-based syngas firing. An in...

The offshore energy industry concerning wind energy is moving its focus towards deeper water locations, which are more fitting to floating rather than bottom fixed support structures. The selection of the appropriate support structure type is an important factor in making the offshore energy industry reliable and efficient for product delivery. The...

The main objective of this study is to design and fabricate a low-cost hybrid solar drying system and present the drying kinetics, heat transfer coefficient and thin layer models for the dried product. For this purpose, two solar dryers one equipped with biomass heater and the other without biomass heater were constructed and tested. The results sh...

The paper presents 3E (energy, exergy and economic) analysis of a modified Kalina power-cooling vapour absorption cycles (KLPCCs) for better thermo-economic figures of merit to drive affordable energy access and climate change mitigation. The analysis presents a balanced technical and economic conclusion in view of resource management and sustainab...

This paper presents eight hybrid renewable energy (RE) systems that are derived from solar, wind and biomass, with energy storage, to meet the energy demands of an average household in the six geopolitical zones of Nigeria. The resource assessments show that the solar insolation, wind speed (at 30 m hub height) and biomass in the country range, res...

This research presents thermo-economic and environmental impact analyses of nineteen thermal power plant configurations for electricity generation. From the results of the analyses, appropriate plants’ parameters were carefully chosen and used in the multi-criteria selection of the optimal plant configuration. The thermodynamic performance criteria...

This study proposes a clean, reliable and affordable hybrid energy conversion technology that is based on sunlight and wind, with a hydro based energy storage system. The proposed system comprises Photovoltaic arrays, wind turbine (WT) and Pumped Hydro Energy Storage (PHES). The study was focused on satisfying energy demand of a typical coastline c...

This paper proposed a combined cooling, heating and power (CCHP) energy system to supply electricity to agrarian communities. The work focused on the thermoeconomic analysis of the proposed plant to assess the techno-economic viability of the plant. It is shown that the agro-wastes briquette (cassava peeling, sawdust and palm fruit fibre) fired ORC...

Energy, exergy, environmental and economic analysis of a proposed municipal waste driven power plant is presented. The proposed waste-to-energy conversion system which utilizes municipal solid waste (generated in Port Harcourt, Nigeria) consists of gasification, solid oxide fuel cell, gas turbine, steam turbine, organic Rankine cycle and absorption...

Remaining strength estimation of corroded pipelines is a major consideration in pipeline integrity management. The loss of pipe wall thickness due to corrosion inevitably leads to a reduction in the pipeline’s strength and ability to sustain a design pressure. If corrosion defects are closely spaced, the corrosion feature may interact, resulting in...

This paper presents the major barriers to sustainable rural electrification in the Niger Delta zone and suggests practicable policy pathways to tackle the barriers to the aggressive utilisation of renewable energy technologies in the Niger Delta zone. The barrier to the penetration of renewable energy technologies in the Niger Delta zone can be gro...

This paper presents the optimal mapping of hybrid energy systems, which are based on wind and PV, with the consideration of energy storage and backup diesel generator, for households in six locations in the South-South geopolitical (SS) zone of Nigeria: Benin-city, Warri, Yenagoa, Port Harcourt, Uyo and Calabar. The optima hybrid energy systems are...

This paper presents the energy, exergy, environmental and economic analysis of a proposed agricultural waste-to-energy integrated multi-generation power plant. The proposed plant will use agro-wastes composed of selected crops and animals wastes from a farm in Rivers state, Nigeria (latitude 4.44°N, longitude 7.1°E). Combined anaerobic digestion an...

The coastline rural communities in the Niger Delta region of Nigeria have long suffered from the consequences of poor rural electrification, environmental degradation, and health challenges. There is an urgent need to provide an optimal sustainable and environment-friendly energy system for the coastline rural communities in Nigeria, which has the...

This paper presents a thermodynamic analysis of an organic Rankine cycle (ORC) in a hot and humid environment. A theoretical procedure is proposed for the determination of the optimal evaporation temperature (OET) and optimal condensing temperature (OCT) of a subcritical ORC plant, which is based on thermodynamic theory; the heat input is selected...

This paper presents the exergoeconomic analysis of a 100 kW solar driven organic Rankine cycle (ORC) power plant for the Port Harcourt climatic zone, latitude 4.5–5.5°N and longitude 6.5–7.5°E, at an ambient temperature range of 23–31°C. A cascade cycle of R134a and R290 working fluids was considered for the proposed plant. The relationships betwee...

Background Nigeria’s rural coastline communities have long suffered from the consequences of both poor rural electrification and environmental degradation. Therefore, there is an urgent need to provide an optimal sustainable and environment-friendly energy system for the coastline communities in Nigeria, which has the potential of ameliorating the...

Affordable and clean energy are both tremendous economic and climate change mitigation opportunities for sustainable development. The rural coastline communities in the Niger-Delta region (the South-South geopolitical zone) of Nigeria, outside the environmental and health concerns, lack in roads, running water and ultimately supply of electricity....

Optimal configuration and design of a hybrid Photovoltaic (PV)-Battery-Diesel-Generator energy system has been proposed to power households in Omavovwe community in the Niger-Delta region of Nigeria. The configuration of the optimal hybrid system is selected based on the Hybrid Optimisation Model for Electric Renewable (HOMER) top-ranked system con...

In jet atomization, breakup length is the length of the continuous jet segment, before its breakup to discontinuous droplets. Hydrodynamic instability theory, implemented in CFD codes, is often complemented by semi-empirical correlations for breakup length, which may limit parametric investigations. A basic mechanistic approach to the breakup lengt...

This paper presents the design parameters for conical hopper, using MS Excel Add-in for hopper design, in the popular range of the wall friction angles for ten food powders in common use, and also correlates these parameters with the physical/flow properties of the powders. The design parameters are the opening diameter, critical applied stress, se...

Effective design of liquid fuel injectors, for application in thermofluid engineering systems, is a function of good understanding of liquid breakup mechanisms. A transient liquid breakup model is developed on the classical interfacial breakup theory by modifying the classical linear perturbation process to include time-dependent base and perturbed...

The potential of the use of hybrid PV-Battery-Diesel generator for household in the rural oil producing communities in the Niger Delta of Nigeria is presented. The analysis was done by the optimum configuration of the hybrid system through top-ranked system configuration, according to the Net Present Cost (NPC) in the HOMER platform. The optimal sy...

A simplified mathematical model is developed for breakup criterion of a turbulence induced droplet breakup. The understanding of the mechanisms of liquid-fuel droplet breakup is critical to liquid-fuel combustion in internal combustion engines, where the efficiency and stability of the engine depend on the atomization process. The atomization proce...

The theory of jet instabilities has been developed under several assumptions, which include the assumption that the jets are steady. The common-rail diesel fuel injection systems utilizing pulsed injection have drastically improved the ability to lower emissions, noise, and fuel consumption. However, with the application of the injection techniques...

Microsoft Excel add-in has been developed for the thermodynamic properties of refrigerant DiflouroEthane(R152a) an alternative refrigerant to R134a, which has no Ozone Depletion Potential. Thermodynamic properties’ equations for R152a were formulated from a popular equation of state. The equations were transformed into a computer program in Microso...

This paper presents the design analysis of a photovoltaic (PV) system to power the CAD/CAM Laboratory at the Department of Mechanical Engineering, University of Port Harcourt. Life cycle cost and break-even point analyses are also carried out to assess the economic viability of the system. The unit cost of electricity for the designed PV system is...

This paper presents an MS Excel spreadsheet add-in for heat exchanger logarithmic mean temperature difference (LMTD) correction factors for ten heat exchanger configurations. It is a computer tool for determining the LMTD correction factors for complex heat exchanger flow arrangements. The charted correction factors for various flow arrangements we...