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All Journal Makara Journal of Technology
Agbo, Cornelius Ogbodo Anayo
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Investigation of the Characteristic Thermal Retention Behaviour of Sandwich Glass-Fibre-Reinforced Composite Panels in Electric Oven Designs Agbo, Cornelius Ogbodo Anayo
Makara Journal of Technology Vol. 26, No. 3
Publisher : UI Scholars Hub

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Abstract

The focus of this paper is to experimentally investigate the characteristic heating and cooling behaviours of a sandwich glass fibre reinforced composite panel electric ovens. A portable conventional electric oven with two stack trays for product placement was designed and fabricated for the evaluation. The oven box consists of sidewalls and a ceiling made of glass-reinforced plastic (GRP) with sandwich glass wool insulation. The oven floor has, in addition to the sandwich panel, a ceramic tile plate placed on the chamber floor to separate the electric heating element. The oven characteristic thermal behaviour was obtained as different product load conditions were being simulated. The heat retention ability of the oven is quite impressive making it possible for the water simulated product to remain warm for up to 13 hours with the testing stockpot open and more than 27 hours with the pot covered. Energy is therefore conserved as the oven can be switched off while the product continues to process. The oven cooking efficiency of approximately 39% was obtained under standard stockpot water test. The oven is therefore suitable for both culinary activities and laboratory experiments requiring moderate temperatures.
Helical Coil Compression Spring Retrofit Design of Wheelbarrow for Optimal Load Carrying Effectiveness Agbo, Cornelius Ogbodo Anayo
Makara Journal of Technology Vol. 29, No. 3
Publisher : UI Scholars Hub

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Abstract

Wheelbarrows are essential multipurpose and dual-function materials handling equipment for many industries and homes. They find exclusive use in the movement of finished goods and raw materials where no other form of transportation works. However, the traditional wheelbarrows require enormous human effort to accomplish the task of conveying a reasonable amount of load from one place to another. During the process, shock loads from road irregularities are transmitted directly to the Barrow pusher. Therefore, this study investigated a retrofitted helical coil, compression spring, wheelbarrow design for effective load transportation. A wheelbarrow with a trapezoidal bucket capacity of 50 l was fabricated and mounted on a hollow pipe galvanized steel chassis frame. The bucket was supported on the front end of the frame using two helical coil compression springs to cushion the shock loads transmitted to the Barrow pusher. For a 150-kg payload, three standard bags of cement equivalent, and a deadweight of 22kg, the spring retrofit design wheelbarrow effectively reduces the galloping shocks through bumps and other path surface irregularities better than conventional non-spring wheelbarrows. The new design can therefore provide succor to the regular wheelbarrow pushers who tend to develop unintended health issues, such as muscular build-up and cramps, as they use a wheelbarrow to move materials over a distance.
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