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K-14 Reflector Concentrator Parabolic Solar Cooker Max temperature: 220c |
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K14 has been extensively tested. Its high concentration level of solar radiation (reaching temperatures up to 220c) makes it ideal for efficient cooking and roasting. Their location includes domestic rural, domestic semi-rural, institutional (institutes and schools, health) and industrial (commercial kitchens, co-operatives).
Demand: Although being in the top price range some k-14s have been sold commercially, and a growing number of orders is in place. It particularly suits these successful communities or co-operatives that undertake communal use or commercial applications.
Manufacture: The reflector parabolic dish of k-14 – made of polished aluminium plates – can be imported from Europe or manufactured locally in Tanzania, at very similar cost. The base is suitable for local manufacture in existing simple metal workshops (design copyright disclosure from the manufacturer has been granted).
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Box oven / Funnel Cooker Max temperature: 150c |
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These are ‘oven-box’ conventional cookers to which an extension or ‘funnel’ is added to increase the concentration of radiation. They are widely used in South America, India and China for domestic applications. They reach cooking temperatures of up to 150c. The simplicity of design, materials and use make them ideal for wide rural implementation throughout East Africa.
Demand: Directed to family units of up to ten people. It is very affordable and easy to use with minimal training, providing a feasible alternative to relieve fuelwood shortages in many researched areas.
Manufacture: The main components (timber, recycled insulation, glass, mirror) are all easily available, and existing uncentralised workshops with minimal infrastructure can undertake manufacture.
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Efficent Stove Work as conventional stoves |
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‘Rocket Stoves’ date back centuries. They have seen common implementation in areas where maximising fuelwood consumption has been a priority in recent decades. They work on the principle of maximising energy consumption through air flow, disposition, materials and insulation, as opposed to the basic three stone fire. Since burning fuelwood and charcoal are the most common sources of energy, implementation of such stoves is very attractive, specially when solar cooking is effective a 80% throughout the year.
Demand: It is very desirable due to the simple fact (as in the other models) that the annual savings in fuelwood are greater than the cost of the device.
Manufacture: There are different methods for the production of ‘rocket stoves’, from off-the-shelf units to self-manufacture. The materials used can vary from concrete to clay, and can effectively be produced by means of local demonstrations. The estimated unit retail price off-the-shelf (unsubsidised) is tsh40-50,000/U$D48-55, and tsh10-25,000 / u$d11-27 for locally enhanced stoves.
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Insulation Baskets Sensible cooking accessory |
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Insulation baskets work both as a compliment to solar thermal cooking, as well as a cooking component to reduce energy consumption. The first instance allows food to be kept hot for many hours (boiled water at 98c will just drop to 85c after ten hours), so meals cooked during daylight can be served unspoiled in the evening, and morning tea served from a hot water reservoir in an insulated basket.
The second instance refers to the fact that once a cooking temperature has been reached, the insulation basket will enable the food continue cooking for a substantial period of time, thus making up to 35% savings of fuelwood, charcoal or kerosene, and up to 65% if used in combination with ‘rocket stoves’.
Demand: The savings in energy consumption from insulation baskets make them an ideal element in our portfolio, welcomed both by users of alternative and conventional methods.
Manufacture: Cardboard, rice-husk, coconut-husk, paper, textile, ukindu, bamboo, are all valid materials, therefore production can easily be decentralised.