Prof. Wilfred I. Okonkwo

My Publications

All Publications

Determination of Cashew Juice specie's Shelf-Life at Natural Storage Using Multivariate Regression Model

There is an inevitable decline in quality value especially the ascorbic acid in preserving cashew apple juice. The maximum shelf life of a red sample of cashew apple juice was estimated and the quality value multivariate regression model was developed. Data were drawn from 3 4 full factorial experiments conducted in three replicates with the order of the replicates randomized. The model developed for the sample of cashew fruit juice revealed that pH and duration of storage with other interaction...

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Development of a modified environment for oyster mushroom (Pleurotus ostreatus) production system for rural use in Southeast Nigeria

This study investigated a Pleurotus ostreatus production in Nsukka, Nigeria, using the locally available materials. A modified controlled environmental system capable of maintaining the micro elements (temperature and relative humidity) suitable for cultivation of oyster mushroom was developed. The system was tested using substrates of biomaterial origin (saw dust and rice bran) at different levels of treatments. The substrates used were fermented sawdust supplemented with rice bran at a spawnin...

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A survey questionnaire of cashew nuts processing methods in Enugu state

Technical investigation on the method and constraints on cashew nuts processing in Enugu state of Nigeria was carried out and a survey made involving the use of questionnaire and personal interview during the field trips. The aim was to technically investigate the difficulties encounter in cashew nuts processing in Enugu State and suggest the means of improving on the difficulties. The manual and mechanical methods of processing cashew nuts were investigated. From the result of the survey, it wa...

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Effect of Drying Temperatures on the Vitamin C Content of Pineapple Fruit (Ananas comosus)

In this study, the effect of processing and drying temperature on the Vitamin C content of pineapples using an electric oven as a case study was done. Samples of fresh pineapple fruit were dried to equilibrium moisture content under di erent constant oven temperatures ranging from 40°C to 70°C and under open air sun drying using the fresh sample as a control. Vitamin C analysis of the fresh pineapple and dried samples were then carried out. The results showed a signi cant di erence (? = 0.05) ...

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Evaluation studies of a mixed mode solar kiln with phase change material and distributed-type solar kiln

The passive thermal performance of a distributed and mixed-mode model solar kiln was compared in the present study. The two kilns were made of double glazed flat plate thermal collector in which paraffin was used as the thermal storage medium. The range of ambient temperatures and daily radiation during the period when the study was carried out were 18.3–33.2 °C and 11.8–20.9 MJ m-2 respectively. The study revealed a peak cumulative efficiency of 44.3% and 40.7% for distributed kiln and 40....

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Evaluation studies of a mixed mode solar kiln with phase change material and distributed-type solar kiln

Comparatively, efficiency of mixed-mode solar kiln is lower than distributed type. • Kiln with PCM as storage medium showed all-time higher temperatures than ambient. • Mixed-mode and distributed kiln performs better in the day and night respectively. A R T I C L E I N F O Keywords: Paraffin Kiln Solar Collector Temperature A B S T R A C T The passive thermal performance of a distributed and mixed-mode model solar kiln was compared in the present study. The two kilns were made of double glaz...

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Optimization of Temperature, Packaging Materials and Time onthe Proximate Compositions of Bambara Nut Flour

Background and Objective: Most diabetic patients in Nigeria rely on Bambara nut flour as food because of its insulin building ability inthe body system, but the challenge is its unavailability all-year-round in the market outlets when needed. The objective of this study wasto use response surface methodology to optimized temperature, packaging material and storage time for Bambara nut flour storage.Materials and Methods: Bambara nut was grounded to the flour and packaged in a high-density polyth...

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Determination of the calorific value of municipal solid waste in enugu, nigeria and its potential for electricity generation

The work aimed at determination of calorific value of municipal solid waste in Enugu, Nigeria and its potential for electricity generation. Random truck sampling was used according to American Society for Testing and Materials (ASTM) in the collection of samples at Ugwuaji landfill site, Enugu, Nigeria and calorific value was determined using oxygen bomb calorimeter. Enugu has a present population of 882,178 and the amount of municipal solid waste generated in Enugu was estimated to be 4...

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Performance study of a solar poultry egg incubator with phase change heat storage subsystem

The performance evaluation of a hybrid solar powered poultry egg incubator is presented in this study. The system consists of a double-glazed flat plate solar collector integrated with a paraffin type phase change material energy storage subsystem and incorporated with a PV subsystem. Results of the study showed that the chamber temperature was within the range of between 36- 39 °C and relative humidity of 50–75%. The temperature ranges of between 42-106 °C and 38–99 °C respectively were ...

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My Quote


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