BrainstormingIdea 1During our brainstorming process, we considered many options. Our first idea in order to satisfy our goal of an efficient,affordable cooker with low to no harmful emissions is a cheap gasifier stove made from scrap metal and old coffee cans, These materials would be the most durable but they are incredibly cheap which would make the product economically feasible for consumers. This idea would also be emission free since gasifiers completely combust wood. They are also the most efficient wood burning stoves for that same reason. Although a coffee can stove would not be the most durable, we hope to manufacture it cheap enough to be replaced periodically.Idea 2Another idea is a plant oil stove that requires no kerosene to start. This would be beneficial toconsumers because plant oil can be made at home and they have to travel to obtain kerosene. Kerosene is also expensive so it would save them money in the long run. We could do this by having an electric starter powered by a battery that would get hot enough to ignite the plant oil. This would make the stove sustainable.Idea 3Another idea involving the implementation of a fan system into the Jiko. One of the mainproblems withburning fuels openly is that often times much of the fuel is wasted/ However if we can increase the amount of air involved in the combustion process, we can increase combustion efficiency and therefore reduce the amount of fuel needed to cook. So the idea we arrived at was simply adding a fan to the Jiko as it is. Sit a fan underneath that would blow through vents to increase airflow to the flames. We place the fan underneath to reduce heat loss because the heat would not exit the bottom of the stove because it rises.Idea 4Another idea we thought up was to combine two previous technologies. Themain issue that people had with the Oorja cooker was that not only did it not get hot enough to cook bread, but it also could not be refueled while lit. We addressed these issues by blending the Oorja with the solar cooker. The solar cooker, which has a satellite type design,relies on focusing the suns rays to a single focal point to generate heat. The Oorja is a closed chamber; it relies on burning smokeless pellets to generate heat. So we figured if we take the entire Oorja system and sit it within a solar cooker we could significantly raise the ambient temperature of the Oorja which in turn might help it raise its maximum temperature. In addition since there would be another heat source, we could use that to supplement the Oorja and provide longer cooking times. So when the fuel in the Oorja runs out, since it cannot be refueled, the heat from the solar cooker can finish out the cooking.Idea 5The final idea we came up with was the implementation of a new fuel source. It is a fuel called ethanol gel fuel. It is a new cleaner more efficient biofuel made from denatured ethanol found in sugar cane or starch crops. The ethanol is mixed with a thickening agent, which in most cases, is cellulose and then mixed with water. The fuel is renewable and is very easily made from resources found in Kenya. Compared to burning wood and charcoal this fuel reduces emission by more than 50% and reduces the need to cut down forests. The fuel can be placed in the existing Jiko in lace of coal or wood.Concept SelectionAlthough our our decision matrix below indicated that the jiko would be the best decision, we decided to go with the gasifier stove after futher research and evaluation.

Figure 2.1-decision matrix

Figure 2.2-Weighted Decision matrix