scholarly journals Development and performance evaluation of an improved biomass cookstove for isolated communities from developing countries

2019 ◽  
Vol 14 ◽  
pp. 100435 ◽  
Author(s):  
Edwin Chica ◽  
Juan F. Pérez
Keyword(s):  
Developing Countries ◽  
Performance Evaluation ◽  
Isolated Communities ◽  
And Performance

scholarly journals Development and Performance Evaluation of a Small-scale Maize Harvester for Developing Countries

2020 ◽  
pp. 144-156
Author(s):  
Julus H. Vodounnou ◽  
Emmanuel A. Ajav ◽  
Gontrand C. Bagan ◽  
Victorin K. Chegnimonhan
Keyword(s):  
Developing Countries ◽  
Performance Evaluation ◽  
Engine Speed ◽  
Small Scale ◽  
Drive Power ◽  
Smallholder Farms ◽  
Testing Experiment ◽  
And Performance ◽  
A Chain ◽  
Chain Conveyor

A small-scale maize harvester was designed and fabricated for developing countries and is composed of a harvester header, a chain conveyor, a drive power unit and a five-wheel tricycle. Fabrication of components was made and assembling of the devices on the tricycle was done. The performance evaluation of the small-scale maize harvester was done at 15% kernels moisture content (wet basis). Three rotational speeds of the engine, 1347, 1521 and 1937 rpm were used, while the forward velocity of the harvester was kept at an average of 0.617 km.hr-1. The testing experiment revealed significant effect of physical properties of maize (p<0,05). The highest machine capacity was obtained at 0.05 ha.hr-1, while the highest driving efficiency was 97.30% and the highest picking and conveying efficiencies were 84.11% and 98.21%, respectively. However, it was observed that the machine noise level decreased with increase in engine speed. Also, the engine speed affected both picking and conveying efficiencies. The designed machine is found suitable for most smallholder farms.

Design and performance evaluation of solar cookers for developing countries: The case of Mutoyi, Burundi

2017 ◽  
Vol 41 (14) ◽  
pp. 2206-2220 ◽  
Author(s):  
Fabio Riva ◽  
Matteo V. Rocco ◽  
Francesco Gardumi ◽  
Giorgio Bonamini ◽  
Emanuela Colombo
Keyword(s):  
Developing Countries ◽  
Performance Evaluation ◽  
And Performance

scholarly journals Ballast Contamination Mechanisms: A Criterial Review of Characterisation and Performance Indicators

2020 ◽  
Vol 5 (11) ◽  
pp. 94
Author(s):  
Daniel Bassey ◽  
Ben Ngene ◽  
Isaac Akinwumi ◽  
Victor Akpan ◽  
Gideon Bamigboye
Keyword(s):  
Developing Countries ◽  
Performance Evaluation ◽  
Performance Indicators ◽  
Cost Efficiency ◽  
Maintenance Costs ◽  
Track Maintenance ◽  
Fundamental Parameters ◽  
Particle Fragmentation ◽  
The World ◽  
And Performance

Across the world, ballasted railway tracks are utilised extensively due to their cost efficiency, ease of drainage, and capacity to withstand cyclic imposed loadings from heavy trains. In spite of these benefits, the ballast is often considered as a flexible medium; as such, its continuous deterioration is largely disregarded. Geotechnical challenges such as ballast contamination in the form of particle fragmentation, deposition of weathered materials, upward pumping of clay and fines from underlayers, and coal intrusion have led to differential settlements and reduced drainability of tracks, thereby exacerbating track maintenance costs. This study reviews existing works of literature to expound on the mechanisms for ballast contamination and to highlight the fundamental parameters that guide the characterisation and performance evaluation of railway ballasts. The study shows that ballast fragmentation accounts for about 76% of commonly recorded contaminations, while it is also observed as the most critical to track stability. As such, a variety of indices and specifications for ballast gradation have been established worldwide to guide practice in ballast characterisation and performance evaluation. However, the mechanisms of ballast fragmentation and deterioration require further research to guide the improvement of contemporary guidelines, and mitigate the risk of abrupt track failures, especially in developing countries.

scholarly journals Design, Fabrication and Performance Evaluation of a Charcoal-Fired Tomato Dehydrator for Developing Countries

2019 ◽  
Vol 4 (9) ◽  
pp. 195-201
Author(s):  
Modupe Atinuke Oluleye
Keyword(s):  
Developing Countries ◽  
Performance Evaluation ◽  
Food Security ◽  
Initial Moisture Content ◽  
Human Consumption ◽  
Microbiological Analysis ◽  
Centrifugal Fan ◽  
The Sustainable Development ◽  
And Performance ◽  
Total Fungi

For the purpose of enhancing the food security and economies of developing countries, thereby meeting the sustainable development goals (SDGs 2030) especially SDG No. 2, which is concerned with hunger alleviation, achieving food security, improving nutrition and promoting sustainable agriculture before the year 2030, an energy-efficient charcoal-fired tomatoes dehydrator having an efficiency of 88.6% and a drying rate of 0.51 kg/hour has been designed, fabricated and tested. It basically comprises of a combustion unit (CU) for heat energy generation through the combustion of charcoal, a heat exchanger unit (HEU) comprising of fins for efficient transfer of the generated heat through a 240 V 0.15 HP DC centrifugal fan and a drying unit (DU). The results of its performance evaluation showed that, with a safe drying air temperature of 50 oC at 6 m/s fan speed, the dehydrator is capable of drying 5 kg of tomatoes per batch from an initial moisture content of 94% to 22% with a final weight of 1.4 kg over a drying period of about 7 hours. The microbiological analysis conducted on the post-drying tomato sample revealed a total bacterial counts (TBC) of 1.61 x 102 cfu/g and a total fungi counts (TFC) of 0.27 x 102 cfu/g which are both far below the allowable limits (103 cfu/g) for human consumption. The dehydrator has proved effective for extending the shelf life of tomatoes by mitigating the rate of spoilage due to microbial activities through drying, thereby enhancing the food security and economy of developing countries.

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