Samuel S. Paul

Analysis of wind speed data and wind energy potential in three selected locations in south-east Nigeria

In this study, the wind speed characteristics and energy potential in three selected locations in the southeastern part of Nigeria were investigated using wind speed data that span between 24 and 37 years and measured at a height of 10 m. It was shown that the annual mean wind speed at a height of 10 m for Enugu, Owerri and Onitsha are 5.42, 3.36 and 3.59 m/s, respectively, while the annual mean power densities are 96.98, 23.23 and 28.34 W/m2, respectively. It was further shown that the mean annual value of the most probable wind speed are 5.47, 3.72 and 3.50 m/s for Enugu, Owerri and Onitsha, respectively, while the respective annual value of the wind speed carrying maximum energy are 6.48, 4.33 and 3.90 m/s. The performance of selected commercial wind turbine models (with rated power between 50 and 1,000 kW) designed for electricity generation and a windmill (rated power, 0.36 kW) for water pumping located in these sites was examined. The annual energy output and capacity factor for these turbines, as well as the water produced by the windmill, were determined. The minimum required design parameters for a wind turbine to be a viable option for electricity generation in each location are also suggested.

Economic Assessment of Water Pumping Systems Using Wind Energy Conversion Systems in the Southern Part of Nigeria

This study assessed the wind energy potential and the economic viability of the water pumping systems supplied by various wind turbine models. The two-parameter Weibull probability density function was employed to analyze the wind speed data collected between 1971 and 2007 by the Nigerian Meteorological Agency for seven meteorological stations, in the southern part of Nigeria, namely Asaba, Calabar, Ogoja, P-Harcourt, Uyo, Benin-City, and Warri. The performance of small to medium size commercial wind turbine models of various rated powers ranging from 5.2 kW to 250 kW were investigated and economic evaluation of the wind energy in all the sites was performed using the levelised cost method. The results showed that the annual mean wind speeds range from 3.09 m/s at Warri to 4.15 m/s at Calabar, while the corresponding annual mean power densities vary from 23.17 W/m2 to 56.22 W/m2. Our analysis demonstrated that the wind resource in all the sites considered fall into Class 1 wind resource category, hence, they can marginally be considered for small scale standalone system for electricity generation. The cost of energy production per kWh for the selected sites varies between

Technical and economic assessment of hybrid energy systems in South-West Nigeria

0.090 at Ogoja and

Structure of turbulent flow over 90° and 45° transverse ribs

2.118 at Uyo. Moreover, the cost of water delivered varies from

Flow Around Finite Circular and Square Cylinders in an Open Channel

3.33 per cubic metres in Calabar to

Analysis of Turbulent Flow Past Bar-Racks

54.96 per cubic metres in Uyo.

PIV Study of Turbulent Flow in Porous Media

The technical and economic assessment of using hybrid energy system for electricity generation in rural communities in the south-west of Nigeria is investigated in this study. Renewable resources (wind and solar data) in Ibadan located on the latitude of 7.43 °N and longitude 3.91 °E are used. Hybrid Optimization Model for Electric Renewable software has been employed to carry out the present study. It was found that Wind-PV-Generator-Battery hybrid system is most suitable option as stand-alone electricity generating system in Ibadan. The optimal simulation results indicate that the levelised cost of energy for this hybrid energy system varies between

Influence of Leading Edge and Spacing on the Near Wake of Cylinder Pairs

0.437/kWh and

Influence of the Leading Edge Geometry on the Near-wake of Rectangular Cylinders

0.606/kWh depending on the diesel price. These costs are significantly lower than the cost of using diesel generator only (without battery) which varies between

Structure of a Rectangular Cylinder with Rounded Leading Edge at Incidence

0.607 and