Department of Mechanical & Automotive Technology Education

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Now showing 1 - 5 of 6
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    Solar water heating system consists of a collector plate to collect solar energy and an insulated storage tank to store hot water which can be used for domestic, industrial and small institutional purposes. This paper presents a systematic design and construction of solar water heater for use in the Hotel, Catering and Institutional Management (H.C.I.M) Department of the Bolgatanga Polytechnic in the Upper East Region of Ghana. The solar water heater was well constructed using locally available materials. A plain glass was used as a collector plate and an aluminium sheet metal obtained from a scrap yard painted black was used as an absorber plate. In addition, copper pipes attached to the absorber plate as fluid carrying tubes were also designed. The solar energy incident on the coated absorber plate transfers the heat to the fluid carrying pipes underneath the absorber plate placed in an insulated casing with a transparent glass cover having a cold and a hot water tank integrated in the system. The water passing through the pipes gets heated and flows into a storage tank by the principle of thermosyphon system. When tested, a maximum fluid output temperature of 80oC was observed at a maximum collector temperature of 55oC with ambient temperature of 37°C, and solar radiation 4.61 kWh/m2 /day on a good sunny day. A total amount of 50 litres of hot water was harnessed which was in excess of hot water needed in the Department. This solar water heating system which is a renewable energy resource will continue to serve the heating needs of the Department and the Polytechnic at large since the area has abundant and consistent solar radiation
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    (Global Institute for Research and Education, 2013) Amedorme Kwabla, Sherry; Agbezudo,r K
    Wind pumping in many instances represents the most effective and economic alternative in areas where other forms of energy are difficult or expensive to obtain. In a developing country like Ghana there exists many opportunities for which wind power can be used effectively and economically to pump water. This paper highlights the construction of a sail windmill with a view to converting the kinetic energy of the wind into reciprocating or rotating motion at the end of the handle of a hand pump which is to be used for pumping underground water from a hand-dug well or bore hole and where possible to generate some amount of electrical power. The technical and economic problems encountered in the construction and steps taken to solve these have been reported. The present construction which has a mechanism that enables the mill to work at very low wind speeds is also capable of delivering a high starting torque. The windmill was locally made using the local materials, skills and tools. The durability and reliability of the windmill was ensured by using quality and chemical-resistant materials
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    Challenges Facing Technical And Vocational Education In Ghana
    (INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH, 2013-06-06) Amedorme Kwabla, Sherry; Fiagbe, A K Yesuenyeagbe
    Technical and vocational education and training (TVET) in Ghana is facing a number of challenges. The problems ranging from the limited number of technical institutes available in the country, lack of facilities and materials for training students, inadequate technical teachers or facilitators, limited number of training institutions for technical teachers and difficulty in career progression to the negative public attitudes and perceptions towards technical and vocational education and training in Ghana. In this paper, these challenges confronting TVET and the pertinent issues are discussed with the aim of recommending ways of addressing them.
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    Causes and Strategies for Reducing Road Traffic Accidents in the Bongo District of Ghana
    (Journal of Engineering Research and Reports, 2023-10-06) Amedorme Kwabla, Sherry; Agebure,Baba Andrews; Amoanab, Norbert Johns
    This study intends to assess drivers’ state of knowledge on the main causes and the best strategies capable of reducing road traffic accidents in the Bongo District of Ghana. Study Design: The study was a descriptive design. Place and Duration of Study: The study was conducted in the Bongo District of the Upper East Region of Ghana between July 2023 and August 2023
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    Computational Study of Two Phase Flow in Pressure Swirl Atomizer using entirely Eulerian Model
    (AIP Publishing, 2016) Amedorme Kwablqa, Sherry; Apodu Joseph
    Atomizers are used in many engineering applications including spray combustion in furnaces, diesel engines, gasoline direct injection (GDI) engines and gas turbine engines. They are also commonly used in applying agricultural chemicals to crops, paint spraying, food processing and cooling of nuclear cores. Pressure swirl atomizers occupy a special position amongst other atomizers because they differ in quality of atomization, simplicity of construction, reliability and low pumping power requirements. Turbulent mixing of liquid and gas in these atomizers is indispensable considerations in the process of atomization. This paper presents a recent Eulerian modelling of two-phase flow in a pressure swirl atomizer using Computational Fluid Dynamics (CFD) STAR-CD code in order to assess its capabilities. In this novel Ʃ-Y_liq atomisation model, an Eulerian description is applied to solve the two-phase flow assuming both liquid and gas phases as a single continuum with high-density variation at large Reynolds and Weber numbers. The transport equations for the liquid mass fraction and interfacial surface density as well as the average density of the liquid and gas phases are modelled, liquid dispersion correctly captured and their numerical results presented. The standard k-ε turbulence model accurately captured the effects of turbulence in the flow. The results also show atomization characteristics such as droplet velocity and predicted droplet Sauter Mean Diameter (SMD) with reasonable order-of magnitudes. Parametric studies were conducted to analyse the influence of liquid viscosity, surface tension, atomizer exit orifice diameter on the spray droplet Sauter Mean Diameter (SMD) at different locations on the spray centreline and radial distances from the symmetry line of the atomizer. The results show reduction in the droplet Sauter Mean Diameter (SMD) for the model as these liquid properties and design variable decrease.