Browsing by Author "Ssegane, Herbert"

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    Irrigation Development in Uganda: Constraints, Lessons Learned, and Future Perspectives
    (Journal of Irrigation and Drainage Engineering, 2017) Wanyama, Joshua; Ssegane, Herbert; Kisekka, Isaya; Komakech, Allan John; Banadda, Noble; Zziwa, Ahamada; Ebong, Tobias Oker; Mutumba, Charles; Kiggundu, Nicholas; Kayizi, Ronald Kato; Mucunguzi, Dominic Banaga; Kiyimba, Florence Lubwama
    Policy makers in sub-Saharan African (SSA) countries have identified irrigation as a key ingredient to boosting food security and income as well as a precursor for agricultural development. However, most SSA countries have hardly exploited their irrigation potential. The overarching aim of this paper is to critically examine factors constraining exploitation of irrigation potential in Uganda. Lessons learned from previous interventions and successes elsewhere from countries comparable to Uganda are drawn and future perspectives to guide effective irrigation planning and development are recommended. From this paper, it is evident that there is no single blanket solution to constraints of irrigation development in SSA. All strategies should be implemented in a holistic manner dictated by specific local conditions. The key to successful adoption of irrigation lies in building the national irrigation capacity, improving access to reliable water for irrigation in proximity of the farms, streamlining extension services for farmers, addressing economic aspects of irrigation, and streamlining land tenure systems and management. It is recommended to operationalize government policy on irrigation by developing national guidelines on irrigated agriculture.
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    Performance Characteristics of a Cooking Stove Improved with Sawdust as an Insulation Material
    (Journal of Renewable Energy, 2021) Okino, Jasper; Komakech, Allan John; Wanyama, Joshua; Ssegane, Herbert; Olomo, Elly; Omara, Timothy
    In developing countries, energy demand from biomass has increased due to exponential population growth. (is has translated into voluminous quantities of wood being used. (e situation is exacerbated by the popular use of inefficient stoves with low thermal insulation, hence contributing to deforestation. In this study, the performance of a cooking stove improved with sawdust as an insulation material was assessed. An insulated fire stove prototype of 26 cm saucepan diameter was designed, constructed, and cast with sawdust and clay in a ratio of 1 :1 (as the first layer) and sawdust alone as the second layer. (e developed stove was tested using a water boiling test to establish its operating performance. (e thermal efficiency of the stove was assessed using indigenous wood fuels used in rural Uganda (Senna spectabilis, Pinus caribaea, and Eucalyptus grandis). Computational fluid dynamics was used to simulate the temperature and velocity fields within the combustion chamber and for generating temperature contours of the stove. Obtained results indicated that S. spectabilis had the highest thermal efficiency of 35.5 ± 2.5%, followed by E. grandis (25.7 ± 1.7%) and lastly P. caribaea (19.0 ± 1.2%) in the cold start phase when compared with traditional stoves. (e stove remained cold as hot air was restricted to the combustion chamber with decreasing temperature contours toward the outer wall up to the ambient temperature. (e velocity flow remained constant as the chamber was colored green throughout due to the shielding of the stove with sawdust as insulation. (e heat flux generated indicated that a thick layer of 6 cm or more could ensure good insulation, and this could be further reduced by introducing more sawdust. (e designed stove has the potential to reduce biomass consumption and emissions when compared to traditional cookstoves. (e inclusion of a chimney draught in the fire stove prototype could reduce smoke and increase thermal efficiency. Further studies should focus on minimizing the thickness of the clay-sawdust (first) layer and increasing the thickness of the sawdust layer to reduce the weight of the fire stove.