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Papers by Osarobo Ighodaro

Research paper thumbnail of Steady State Analysis of Nanofuel Droplet Evaporation

International Journal of NanoScience and Nanotechnology, Aug 1, 2019

The potential for nanofuels as one of the clean sources of energy on account of its enhanced comb... more The potential for nanofuels as one of the clean sources of energy on account of its enhanced combustion performance coupled with low emissions has been established. Considering the importance of the fuel evaporation phase in the entire combustion process, this work presents an attempt at applying the steady state analysis equations to nanofuel experimental data obtained from the literature in droplet evaporation analysis. The evaporation parameters considered included the rate, constant value (k), the droplet lifetime as well as the D 2 Law response. The extent of applicability of the steady state analysis model equations to nanofuel droplet evaporation was investigated using nanofuel experimental data consisting of ethanol and alumina nanoparticles as well as n-decane and alumina nanoparticles with particle concentration ranging from 0.5-2.5%. The evaporation rate was found to decrease with increasing nanoparticle addition while the droplet lifetime increased marginally, thus validating experimentally obtained result. The nanoparticle inclusion had no effect on the evaporation rate constant value (k) as it remained unchanged throughout the droplet evaporation progression, thus showing adherence to the Classical D 2 Law.

Research paper thumbnail of Exergetic appraisal of Delta IV power station, Ughelli

Journal of Emerging Trends in Engineering and Applied Sciences, Apr 1, 2011

In this study, exergy is used to measure the performance of Delta IV power station located in Ugh... more In this study, exergy is used to measure the performance of Delta IV power station located in Ughelli, Delta State, Nigeria. The choice of exergy as a means for performance appraisal is based on the fact that it provides a birdâ??s eye view of the sources of the major losses in the system, thus giving us a clue on how best to optimize the system under observation. Analyses are done using the first and second law of thermodynamics and results are presented in tables. In the exegetic analyses, mass and energy conservation laws were applied to each component. The compressor was seen to have the largest exergetic efficiency while that of the total plant was 45.7%. The combustion chamber had the largest exergetic destruction (56%) while that of the total plant was 58.5%.

Research paper thumbnail of Characterization and comparison of the thermophysical property of ternary and quaternary salt mixtures for solar thermal power plant applications

Research paper thumbnail of A novel empirical model for predicting the heat accumulation of a thermal energy storage medium for solar thermal applications

Journal of Energy Storage

Research paper thumbnail of Numerical modelling of solid oxide fuel cells: role of various cell parameters on performance

Research paper thumbnail of An equilibrium model of NOx emission in gas turbine combustors

Nigerian Journal of Technology

In this study, an equilibrium model for NOx emission in gas turbine combustors was developed. The... more In this study, an equilibrium model for NOx emission in gas turbine combustors was developed. The model is based on the governing thermodynamic, materials, and energy balance equations. Results obtained from the model simulation were compared with operational data from a local gas turbine power plant. There was about a 3 to 6 percent deviation for the periods considered. Consequently, the model is reliable in the design of new combustors and in assessing the pollutant emission during operations. It was established that factors that affect NOx formation include flame temperature and quantity of excess air used. Furthermore, the results revealed that the most important parameter that governs the formation of NOx is flame temperature, as the formation of NOx rises exponentially with an increase in the combustor flame temperature.

Research paper thumbnail of Energy Growth and Sustainability Through Smart Grid Approach: a Case Study of the Nigeria Electric Grid

International Review of Electrical Engineering (IREE), 2021

Research paper thumbnail of Modelling and simulation of intermediate temperature solid oxide fuel cells and their integration in hybrid gas turbine plants

.................................................................................................... more ...................................................................................................i Table of content.........................................................................................iii List of Figures............................................................................................ix List of Tables...........................................................................................xiv Nomenclature...........................................................................................xvi Acknowledgements......................................................................................xx CHAPTER1 : Introduction ........................................................................................ 1 1.1 Hydrogen, the fuel for our future ................................................................... 1 1.2 Fuel cells ....................................................................................................... 4 1.2.1 Types of fuel cells ................................................................................... 6 1.3 Solid Oxide Fuel Cells ................................................................................. 12 1.3.1 SOFC components ............................................................................... 13 1.3.2 Classifications of SOFCs ...................................................................... 16 1.3.3 SOFC fuels ........................................................................................... 21 1.4 Thesis objective and structure ..................................................................... 21 CHAPTER2 : Literature Review ............................................................................. 24 2.

Research paper thumbnail of Thermo-economic analysis of a heat recovery steam generator combined cycle

Nigerian Journal of Technology, Apr 17, 2019

A significant amount of energy gets lost through the exhaust of simple gas turbine plants, more o... more A significant amount of energy gets lost through the exhaust of simple gas turbine plants, more often than not, this energy can be used to run another power cycle or a combined heat and power setup, leading to an increase in the overall efficiency of the plant, reduce air pollution and energy wastage. In this study, a retrofitted performance analysis of incorporating a steam power cycle to the existing gas turbine cycle in Delta IV power station is carried out, the analysis is carried out using first law of thermodynamics and energy cost comparison to describe the effect of combining both cycles on power output, thermal efficiency and energy cost. Operating data were obtained from existing gas thermal plant in Ughelli (Delta IV) and steam thermal plant in Lagos (Egbin). Preliminary assessment shows that power output increases by a further 51.5MW, thus raising the overall combined efficiency to 41.85%. Analysis on cost savings accruable from incorporating a heat recovery steam generation was also done and significant savings in cost was obtained.

Research paper thumbnail of Energy Analysis of A Retrofitted Regenerative Gas Turbine Organic Cycle in Ihovbor Power Plant

Research paper thumbnail of Modeling and Performance Analysis of a Small Horizontal Axis Wind Turbine

Journal of Energy Resources Technology

Wind energy is increasingly becoming a major discussion amongst renewable energy sources due to i... more Wind energy is increasingly becoming a major discussion amongst renewable energy sources due to its sustainability, reduced impact on the environment, and being significantly cheaper than conventional fossil fuels. Researchers have been particularly concerned with studying improved design and optimization using computational technique and experimentation. This research aims at designing blades for a small horizontal axis wind turbine for low Reynolds number using blade element momentum theory and using computational fluid dynamics (cfd) and experiment to analyze its performance. Two airfoils (SG6050 and SG6043) were selected for different regions of the blade span. Four turbulent models were used in predicting its performance. The performance was analyzed for wind speeds between 2 m/s and 7 m/s. Studies showed that the blade is capable of generating power up to 241 W with a power coefficient of 34.3% at a speed of 6 m/s. The computed power coefficient is in good agreement with exper...

Research paper thumbnail of Steady State Analysis of Nanofuel Droplet Evaporation

International Journal of NanoScience and Nanotechnology, Aug 1, 2019

The potential for nanofuels as one of the clean sources of energy on account of its enhanced comb... more The potential for nanofuels as one of the clean sources of energy on account of its enhanced combustion performance coupled with low emissions has been established. Considering the importance of the fuel evaporation phase in the entire combustion process, this work presents an attempt at applying the steady state analysis equations to nanofuel experimental data obtained from the literature in droplet evaporation analysis. The evaporation parameters considered included the rate, constant value (k), the droplet lifetime as well as the D 2 Law response. The extent of applicability of the steady state analysis model equations to nanofuel droplet evaporation was investigated using nanofuel experimental data consisting of ethanol and alumina nanoparticles as well as n-decane and alumina nanoparticles with particle concentration ranging from 0.5-2.5%. The evaporation rate was found to decrease with increasing nanoparticle addition while the droplet lifetime increased marginally, thus validating experimentally obtained result. The nanoparticle inclusion had no effect on the evaporation rate constant value (k) as it remained unchanged throughout the droplet evaporation progression, thus showing adherence to the Classical D 2 Law.

Research paper thumbnail of Exergetic appraisal of Delta IV power station, Ughelli

Journal of Emerging Trends in Engineering and Applied Sciences, Apr 1, 2011

In this study, exergy is used to measure the performance of Delta IV power station located in Ugh... more In this study, exergy is used to measure the performance of Delta IV power station located in Ughelli, Delta State, Nigeria. The choice of exergy as a means for performance appraisal is based on the fact that it provides a birdâ??s eye view of the sources of the major losses in the system, thus giving us a clue on how best to optimize the system under observation. Analyses are done using the first and second law of thermodynamics and results are presented in tables. In the exegetic analyses, mass and energy conservation laws were applied to each component. The compressor was seen to have the largest exergetic efficiency while that of the total plant was 45.7%. The combustion chamber had the largest exergetic destruction (56%) while that of the total plant was 58.5%.

Research paper thumbnail of Characterization and comparison of the thermophysical property of ternary and quaternary salt mixtures for solar thermal power plant applications

Research paper thumbnail of A novel empirical model for predicting the heat accumulation of a thermal energy storage medium for solar thermal applications

Journal of Energy Storage

Research paper thumbnail of Numerical modelling of solid oxide fuel cells: role of various cell parameters on performance

Research paper thumbnail of An equilibrium model of NOx emission in gas turbine combustors

Nigerian Journal of Technology

In this study, an equilibrium model for NOx emission in gas turbine combustors was developed. The... more In this study, an equilibrium model for NOx emission in gas turbine combustors was developed. The model is based on the governing thermodynamic, materials, and energy balance equations. Results obtained from the model simulation were compared with operational data from a local gas turbine power plant. There was about a 3 to 6 percent deviation for the periods considered. Consequently, the model is reliable in the design of new combustors and in assessing the pollutant emission during operations. It was established that factors that affect NOx formation include flame temperature and quantity of excess air used. Furthermore, the results revealed that the most important parameter that governs the formation of NOx is flame temperature, as the formation of NOx rises exponentially with an increase in the combustor flame temperature.

Research paper thumbnail of Energy Growth and Sustainability Through Smart Grid Approach: a Case Study of the Nigeria Electric Grid

International Review of Electrical Engineering (IREE), 2021

Research paper thumbnail of Modelling and simulation of intermediate temperature solid oxide fuel cells and their integration in hybrid gas turbine plants

.................................................................................................... more ...................................................................................................i Table of content.........................................................................................iii List of Figures............................................................................................ix List of Tables...........................................................................................xiv Nomenclature...........................................................................................xvi Acknowledgements......................................................................................xx CHAPTER1 : Introduction ........................................................................................ 1 1.1 Hydrogen, the fuel for our future ................................................................... 1 1.2 Fuel cells ....................................................................................................... 4 1.2.1 Types of fuel cells ................................................................................... 6 1.3 Solid Oxide Fuel Cells ................................................................................. 12 1.3.1 SOFC components ............................................................................... 13 1.3.2 Classifications of SOFCs ...................................................................... 16 1.3.3 SOFC fuels ........................................................................................... 21 1.4 Thesis objective and structure ..................................................................... 21 CHAPTER2 : Literature Review ............................................................................. 24 2.

Research paper thumbnail of Thermo-economic analysis of a heat recovery steam generator combined cycle

Nigerian Journal of Technology, Apr 17, 2019

A significant amount of energy gets lost through the exhaust of simple gas turbine plants, more o... more A significant amount of energy gets lost through the exhaust of simple gas turbine plants, more often than not, this energy can be used to run another power cycle or a combined heat and power setup, leading to an increase in the overall efficiency of the plant, reduce air pollution and energy wastage. In this study, a retrofitted performance analysis of incorporating a steam power cycle to the existing gas turbine cycle in Delta IV power station is carried out, the analysis is carried out using first law of thermodynamics and energy cost comparison to describe the effect of combining both cycles on power output, thermal efficiency and energy cost. Operating data were obtained from existing gas thermal plant in Ughelli (Delta IV) and steam thermal plant in Lagos (Egbin). Preliminary assessment shows that power output increases by a further 51.5MW, thus raising the overall combined efficiency to 41.85%. Analysis on cost savings accruable from incorporating a heat recovery steam generation was also done and significant savings in cost was obtained.

Research paper thumbnail of Energy Analysis of A Retrofitted Regenerative Gas Turbine Organic Cycle in Ihovbor Power Plant

Research paper thumbnail of Modeling and Performance Analysis of a Small Horizontal Axis Wind Turbine

Journal of Energy Resources Technology

Wind energy is increasingly becoming a major discussion amongst renewable energy sources due to i... more Wind energy is increasingly becoming a major discussion amongst renewable energy sources due to its sustainability, reduced impact on the environment, and being significantly cheaper than conventional fossil fuels. Researchers have been particularly concerned with studying improved design and optimization using computational technique and experimentation. This research aims at designing blades for a small horizontal axis wind turbine for low Reynolds number using blade element momentum theory and using computational fluid dynamics (cfd) and experiment to analyze its performance. Two airfoils (SG6050 and SG6043) were selected for different regions of the blade span. Four turbulent models were used in predicting its performance. The performance was analyzed for wind speeds between 2 m/s and 7 m/s. Studies showed that the blade is capable of generating power up to 241 W with a power coefficient of 34.3% at a speed of 6 m/s. The computed power coefficient is in good agreement with exper...