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Articles by A.A. Adeyanju
Total Records ( 15 ) for A.A. Adeyanju
  A.A. Adeyanju and W. Compton
  The study shows the theoretical determination of a thermoelectric module and heat sinks sizing and it was discovered that for a cooling time of 2 min and a beverage size of 474 mL (16 oz), 6 TEC modules and hence 12 heat sinks (one for each side of the TEC module) were needed. However, by increasing cooling time to 4 min and decreasing beverage size to 325 mL, 4 TEC modules and hence 8 heat sinks could be used.
  K. Manohar and A.A. Adeyanju
  Energy is one commodity on which the provision of goods and services depend. Its availability and consumption rate is an economic index to measure the development of any community. In Nigeria, there is a limitation to power supply from the National grid which has adversely affected the economic and social development of the populace. This really necessitates the need for decentralized power source as a viable alternative to which hydro power schemes readily fits in. Major rivers and dam’s development provide an enviable energy potential for the exploitation of hydro energy in Nigeria. This study presents analysis of hydro power as renewable energy resource potentials in Nigeria with the status of the database including its adequacy and gaps. A detailed analysis of the technical and technological assessment, present demand and supply situation is also made.
  A.A. Adeyanju
  The velocity variation within the porous medium depends on the structure of the packed bed. This behaviour exhibits hydrodynamic mixing at the pore scale. The pressure drops occurring across the porous medium is attributed to several factors, including form drag, viscous drag from bounding wall and inertia force. The obtained results from this study confirm that the pressure drop is a linear function of flow velocity at low Reynolds number regime and a quadratic function at higher Reynolds numbers. The morphological effect is an additional factor in determining pressure drop.
  A.A. Adeyanju
  The quality control of pore sizes and pore distributions are critical to its success in providing an alternative for pore-scale simulations. However, care must also be exercised, while checking the mesh quality, as this also controls accuracy in all numerical simulations. There are limitations to the technique and some remedies to overcome these limitations. To produce reliable solutions at the pore-scale, adequate amount of grid points across the pores are required. In low porosity porous media, the void volume occupied by fluid is much less than in the high porosity ones. Hence, with prescribed uniform mesh spacing, this is equivalent to fewer cells and less resolution available for solving the Navier-Stokes equations. To meet this requirement of sufficient resolution, the technique of adaptive meshing has been incorporated in this study to locally refine meshes further in those regions that require it. This technique is robust in accurately predicting transport in porous media, while accounting for pore-scale phenomena.
  A.A. Adeyanju
  Modeling of packed-bed heat transfer can be a problem of immense complexity in some cases requiring the use of 3-D finite-element techniques to understand the dynamics of stratification and fluid-solid interaction during different modes of operation. The analytical solution to the packed bed heat transfer was identified in this study and a set of governing equations that economically and accurately characterize the dominant energy transfer mechanisms in a charging or discharging packed bed storage tank over long time periods that include multiple cycles were analyzed.
  A.A. Adeyanju and K. Manohar
  Various types of energy storage techniques are reviewed and their performances in storing energy compared in this study. Water storage systems required very large volume for large heat storage capacities and corrosion problem for long operation periods. There is also stratification problem and due to this controls are required. Scale formation is another problem with such systems. With packed-bed storage there is no corrosion or scale forming problem but volume of the system might increase with an increase in cost. On the other hand, by the use of phase change storage systems, large volumes required by the other two types are eliminated because of the bond interaction of the storage material and the container, storage material looses its energy storage characteristics after a period of time.
  A.A. Adeyanju
  The purpose of this study is to analyze the technical feasibility of a micro hydro installation and the principles of extracting electricity from a water source and the types of hydroelectric schemes used. This continued with the investigation into an understanding of the technology and the components required completing a hydroelectric system, these included the various types of turbine, mechanical plant and civil works. By performing this literature review, it was made clear what information and components would be required and how the overall performance could be calculated.
  A.A. Adeyanju
  The study shows the comparison between thermoelectric refrigeration and vapor compression refrigeration. Three tests were carried out on 325 mL of water in a glass jar. The result shows that for the refrigerator freezer space, the temperature of the water decreased linearly with increasing time. However, for the thermoelectric refrigeration, the water temperature decreased exponentially with increasing time. In other words, cooling rate for the refrigerator was constant while for the thermoelectric it decreased exponentially. The study also shows that the freezer of a vapor compression refrigeration took 61 min to cool the water to 6°C while the thermoelectric 69 min. It can be seen that for the majority of the cooling time, the thermoelectric was cooling at a faster rate than the freezer. But by virtue of the exponential cooling versus linear cooling, cooling rate for the thermoelectric decreasing while the freezer cooling rate was constant throughout the cooling process.
  A.A. Adeyanju , T.O. Oni and D.O. Akindele
  Experimental analysis of thermo-physical properties of concrete is necessary in order to determine a concrete composition suitable for thermal energy storage. This study carries out a laboratory experimentation in order to obtain the absolute thermal conductivity, resistivity and diffusivity of different composition of concretes with their strength test and it was discovered that concrete mix of ratio 1:2:0 (cement:sand:gravel) has the highest compressive strength of 74.5 N mm-2, lowest thermal conductivity of 0.51 W/m°C thermal storage capacity of 2.74 J m-3K while the mix of ratio 1:1.2:1.1 has the highest thermal storage capacity of 3.22 J m-3 K and that of ratio 1:1.9:1.7 has the highest thermal conductivity of 1.7 W/m°C.
  A.A. Adeyanju
  The wind energy resource situation in Nigeria including the estimated potential, economic competitiveness, technical assessment, cost comparison of wind energy technologies with other energy technologies, available amount of the resource and global wind energy utilization are presented in this study. The status of the database is discussed indicating its degree of adequacy and an identification of the gaps. Wind speeds in Nigeria range from a low 1.4-3.0 m sec-1 in the Southern areas and 4.0-5.12 m sec-1 in the extreme North. Wind speeds in Nigeria are generally weak in the South except for the coastal regions and offshore locations. In Nigeria, peak wind speeds generally occur between April and August for most sites. Initial study has shown that total actual exploitable wind energy reserve at 10 m height may vary from 8 MWh year-1 in Yola to 51 MWh year-1 in the mountain areas of Jos Plateau and it is as high as 97 MWh year-1 in Sokoto. Hence, Nigeria falls into the poor/moderate wind regime.
  A.A. Adeyanju and K. Manohar
  An experimental study on the thermal and mechanical properties of steel-fiber-reinforced concrete for solar/thermal energy storage purposes is presented in this report. It takes into account the results of measurements of thermal conductivity, thermal resistivity, thermal diffusivity and the results of compressive strength as well as thermal energy storage calculated from the knowledge of the above measured parameters. The Experimental testing method is described as well based upon the linear heat source theory, it requires the use of a special probe to be inserted into the sample. The experimental programme was forwarded to test concrete aggregate mixtures with three different sizes of steel fibers and one plain concrete. The measurements were carried out from the pouring time of cubic samples and were ended up when hardened conditions were achieved. The results indicate that the steel fibers have influence on the thermal properties of the concretes tested.
  A.A. Adeyanju
  This study present a number of experimental renewable energy systems with hydrogen energy buffering. The first generation of systems demonstrated that hydrogen could be generated from surplus renewable input power through water electrolysis and stored for both short-term and seasonal energy buffering. They illustrated that a continuous supply of power can be derived from an intermittent renewable energy source coupled to the appropriate hydrogen conversion devices. However, the test-beds were constructed primarily from custom components often one-off prototypes and were plagued with reliability issues. Energy self sufficiency was for the most part not obtained due to the limited energy generated from the renewable sources coupled with poor component efficiencies and large parasitic system loads. All of the demonstration projects report major operational problems with the fuel cells used in the regenerative subsystem. They revealed that significant advances in electrolyser, fuel cells, hydrogen storage and power conditioning technologies were required before reliable system operation could be achieved.
  A.A. Adeyanju and K. Manohar
  The review of heat transfer in packed beds has been carried out with the emphasis on both experimental and theoretical techniques. It is observed that the two major modes of heat transfer, namely, conduction between the particles in the bed and convection between the flowing fluid and the particles, interact with each other. Also, in the designing of packed bed for thermal energy storage application the Biot number should be kept as low as possible so that the thermal resistance within the solid does not become dominant.
  A.A. Adeyanju , E. Ekwue and W. Compton
  The study shows the experimental and theoretical analysis of a fast beverage chiller based on the principle of a thermoelectric refrigeration and it was discovered theoretically that for a cooling time of 2 min and a beverage size of 474 mL (16 Oz), 6 TEC modules and hence 12 heat sinks (one for each side of the TEC module) were needed. However by increasing cooling time to 4 min and decreasing beverage size to 325 mL, 4 TEC modules and hence 8 heat sinks could be used. Comparison were also made between the beverage chiller’s cooling time with cooling times obtained from the freezer space and cold space of a household refrigerator. All three tests were carried out on 325 mL of water in a glass jar. The result shows that for the refrigerator freezer space, the temperature of the water decreased linearly with increasing time. However for the beverage chiller, the water temperature decreased exponentially with increasing time.
  A.A. Adeyanju
  The solar thermal energy resource situation in Nigeria including the estimated potential and available amount of the resource are presented in this study. The status of the database is discussed indicating its degree of adequacy and an identification of the gaps. The National Energy Policy Document states that Nigeria lies within a high sunshine belt and within the country; solar radiation is fairly well distributed. The annual average of total solar radiation varies from about 12.6 MJ m-2 day (3.5 kWh m-2 day) in the coastal latitudes to about 25.2 MJ m-2 day (7.0 kWh m-2 day) in the far North. Assuming an arithmetic average of 18.9 MJ m-2 day (5.3 kWh m-2 day), Nigeria therefore has an estimated 17, 459, 215.2 million MJ day-1 (17.439 TJ day-1) of solar energy falling on its 923,768 km2 land area. Energy is one commodity on which the provision of goods and services depend, its availability and consumption rate is an economic index to measure the development of any community. In Nigeria, there is a limitation to power supply from the National grid which has adversely affected the economic and social development of the populace. This really necessitates the need for decentralized power source as a viable alternative to which solar/thermal energy readily fits in.
 
 
 
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