Browsing by Author "Marfo, Daniel"

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    Machine learning of redundant energy of a solar PV Mini-grid system for cooking applications
    (Solar Energy, 2023) Opoku, Richard; Adjei, Eunice A.Mensah, Gidphil; Adjei, Eunice A.; Dramani, John Bosco; Kornyo, Oliver; Nijjhar, Rajvant; Addai, Michael; Marfo, Daniel; Davis, Francis; Obeng, George Yaw; 0000-0001-8766-3402; 0000-0003-2702-6465; 0000-0002-7945-8676; 0000-0002-3640-2664; 0000-0001-8886-7853
    Solar PV mini-grids are increasingly being deployed in off-grid and island communities especially in sub-Saharan Africa (SSA) countries to meet household energy demand. However, one challenge of solar PV mini-grids for community energy supply is the mismatch between the PV energy generation and household energy demand. PV mini-grid energy generation is highest in the afternoon whilst household energy demand is highest in the mornings and evenings, but lowest in the afternoons. This mismatch creates redundant energy generation during peak sunshine hours when battery energy storage is full, leading to low profitability for mini-grid systems. In this study, four machine learning models have been applied on an installed 30.6 kW mini-grid system in Ghana to ascertain the level of the redundant energy. The study has revealed that redundant energy exists on the mini-grid, in the range of 56.98 – 119.86 kWh/day. Further analysis has shown that the redundant energy can support household cooking energy demand through sustainable thermal batteries. With the four machine learning (ML) models applied in predicting the redundant energy, the most accurate ML model, K-nearest Neighbour Regressor, had a root mean square error (RMSE) of 0.148 and a coefficient of determination (R2 ) value of 0.998.
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    Mine feasibility study: a model for gold projects in Ghana
    (1998-02-14) Marfo, Daniel
    In Ghana, a detailed final feasibility report is considered a vital requirement for the grant of a mining lease and as a bankable document which should be accepted by all funding agencies and other investors who might provide funds in the form of loan or equity capital. Final feasibility reports, which do not meet the standards in the Ghanaian investment climate, are often queried and some rejected outright, a situation which can bring frustrations to investors. Although some guidelines for writing final mine feasibility reports are provided, they do not spell out the level of details required and the format for presentation. In this thesis, comprehensive and step-wise approach to mine feasibility study in the Ghanaian investment climate is formulated. Most typical examples from some mines in Ghana are presented. A detailed table of contents and the format for presentation of final feasibility reports to be followed by authors of mine feasibility reports are also presented. Finally, it is recommended that the Minerals Commission of Ghana should put in place a mechanism where proponents will be required to, as in the case of Environmental Impact Statements, submit it a scoping report for auditing and acceptance before embarking on the actual preparation of the feasibility reports. It also recommended that a team of professionals should be made to manage final feasibility reports in Ghana.