Prof. Wilfred I. Okonkwo

My Publications

All Publications

Development of a Prediction Model for Household Solid Waste Generation and Management in an Emerging Urban Area.

Accurate prediction of household solid waste (HSW) generation is essential for improved solid waste management system. Modeling techniques are useful for successful and accurate prediction of HSW generation in municipalities. Two different models for predicting generation rate of HSW and the Organic fraction of household solid waste (OFHSW) for individual households of the city of Nsukka, Enugu State Nigeria were developed using multiple linear regression technique. The predictor variables in th...

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Design, Construction and Performance Evaluation of a Trombe Wall Poultry Chick Brooding House

In this study a Trombe wall powered poultry brooding house capable of handling 2000 day old chicks for a period of five weeks brooding period was designed, constructed and the performance evaluation conducted at National Centre for Energy Research and Development, University of Nigeria, Nsukka, Nigeria latitude 6o 56N. The major components of the poultry brooding house were a Trombe wall system measuring 10 m x 8.08 m with 0.25 m thick wall for solar energy collection and storage and a floor are...

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Energy performance of biomass cookstoves using fuel briquettes

In this study, the energy performance of an improved cookstove (ICS) is evaluated and compared with the performance of a charcoal stove and the three-stone fire using two biomass fuel – rice husk and sawdust briquettes. The performance of the cookstoves is evaluated based on the standard testing protocol of water boiling test in three phases – cold start, hot start and simmering. The energy performance of the cookstoves is compared using analysis of variance (ANOVA). The results of the study...

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Effects of roasting on the physical properties of Monodora myristica (African nutmeg)

Changes in the physical properties of Monodora myristica seeds during roasting were investigated. Roasting parameters which include the roasting temperature at three levels (140, 170 and 200o C) and roasting time at four levels (2, 7, 12 and 17 min.) were employed resulting in a 3 x 4 factorial experiment. The physical properties of the seeds investigated include the size, shape, volume, bulk and solid density, porosity, surface area, specific surface area, angle of repose and the sta...

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Design and Analysis of a Multipoint Temperature Datalogger

In this work, a low cost six- multipoint temperature data logger was developed. It was designed using LM35 as the sensor, and arduino Uno as the data processing element. The response time of the sensor was observed to be between three and four minutes. The comparative evaluation of the system with other established thermometers show that no two temperature meters gave the same values. However the most important thing is that all the systems recorded the same temperature flow pattern. This indica...

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IMPACT OF SOLAR AND KEROSENE STOVE BROODING METHODS ON GROWTH RATE AND HAEMATOLOGICAL PARAMETERS OF BROILER CHICKEN

The study compared the growth performance and haematology of broilers raised under solar and kerosene stove brooding systems. A total of 100 day-old broiler chicks were randomly assigned into 2 groups (A and B) of 50 birds each. Chicks in group A were placed in the solar brooder while those in group B were placed under the kerosene stove brooding method. The birds in each group were weighed weekly and their feed intake determined daily. At the 6 th week, 3 ml of blood was collected from 5 birds ...

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DESIGN, FABRICATION AND PERFORMANCE EVALUATION OF A MAGNETIC SIEVE GRINDING MACHINE

The use of grinding machine is one of the simplest methods of processing agricultural raw materials alternative to the traditional methods of grain/tuber processing using stone, mortar and pestle. However, machines constructed using metal plates results in tearing and wearing away of the materials of construction. The effect of this is the contamination of the processed foodstuff. This is known to have negative health implications when accumulated and consumed in large quantities. In this study,...

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Characterization of a Fibre Reinforced Plastic Concentrating solar cooker

Materials remain the most vital input in engineering construction. Many materials exist for solar cooker fabrication. But much is not known of fibre reinforced plastic (FRP) material in solar cooker fabrication more especially in Nigeria. A concentrating solar energy cooker was designed, constructed and characterized at the National Centre for Energy Research and Development, University of Nigeria, Nsukka, lat 6.8oN and long.7.29oE Nigeria. The study involved construction of mold and a scrap...

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The Role of Unit Operations in Agricultural Products Processing

At the time of harvest, most foods are likely to contain contaminants, to have components which are inedible or to have variable physical characteristics (for example shape, size or colour). It is therefore necessary to perform one or more of the unit operations of cleaning, sorting, grading or peeling to ensure that foods with a uniformly high quality are prepared for subsequent processing. This paper examines the role of unit operations in agricultural products processing. The study ad...

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My Quote


“Just as Houses are made of stones, so is science made of facts.”
Henri Poincare