Slide 1Summary of ResearchDesign MotivationRefined Engineering SpecsSlide 5Physical InteractionsFunctional InteractionsFunctional Interactions (cont’d)Prototype Development and TestingKey Business Goals: ManufacturingKey Business Goals: MarketingKey Business Goals: SustainabilityProposed Business PlanChallengesChallenges (cont’d)Slide 16Slide 17Address the ChallengesTeamworkStove ImprovementDana LevineMaritza RuizLeón LiuDaniel TalancónEsteban MendozaVideo of stove in useMost stoves are not enclosedBiggest complaint about current stoves◦SmokeThose interviewed are aware of the health risks associated with smokeThey would be willing to modify their stoves$37 US per month in woodReduce smoke emission◦More fully enclose the combustion chamber◦Utilize existing ventilationchimney Reduce smoke production◦More efficient combustionBetter air flow◦www.youtube.com/watch?v=A7EWQMnNGt0Door assembly◦Dimensions: 5”x22”x2” solid◦Material: Adobe ClayReinforced with straw◦Rigidly mounted on 2 bricks6.5x11x23 (cm)Figure showingPrimary air intake And door assemblyPipe Assembly◦Dimensions of each U-bent pipe◦1” dia. x 66” long◦top-half perforated with 1/8” holes◦2 U-pipes are bound together with wireAllow for different stove sizesFigure with semi-perforated U-bent pipesUser Interactions◦Pipes removable for cleaningHose or Brush◦Door is easy to moveBricks do not get hot (material)Can rest on back for loadingCan be tilted forward to check fireCan be removed entirely for pipe removal/stove cleaningStove Interactions◦Geometric ConsiderationsDoor (Integral)◦Blocks bears the load of the door (cemented on)◦Blocks elevate door◦Door blocks smoke from entering room◦Elevated door allows for primary air to reach flames◦Interaction between door and pipesProvides increased smoke concentration Retains heat to increase chamber temperatureElevated bricks allow for pipes to be exposed to airSecondary Air Intake (Integral)◦Oxygen deficiency in combustion chamber creates a current of air being sucked into the stove◦Heat from fire warms air◦Perforated tubes release warmed oxygen into combustion chamber◦Increased smoke concentration and higher chamber temperature ignites smoke near perforated tubes◦This improves the efficiency of burningResults in less wasted fuelDevelopment◦Examine choice of door Material, dimensions, and handle placement◦Assess efficacy of secondary combustion systemVary the number and arrangement of U-tubesTesting◦Use a surrogate stove to measure: Qualitative decrease in smoke productionQuantitative increase in efficiencyBased on results, we will select our final designIndependent production of door assembly and metal tube assembly◦Determine cost of raw materialsBulk discount?Establish partnership with laborers/artisans for production◦Fix wages for laborers ◦Secure a place for storage of finished productsFactor cost of transporting raw and finished goodsSelect representative for selling our product◦local hardware store ◦independent vendorOffer of demonstrations◦Decide whether vendor will help with installation◦Assess effect on price vs. likelihood of consumer purchasingChoose sales strategy◦Sell product as a package (with replacements)◦Establish pricesDistinguish vendor’s price with final consumer priceExpand business model to accommodate other local villages◦E.g. Hardware store services several communitiesEncourage households to keep track of wood consumption◦Identify how much money/wood is saved with use of productPromote maintenance of product◦Tips or accessories for cleaning◦Replacement partsPartner with central hardware stores◦Provide services to multiple villagesSupply stove improvement kits◦ With replacement partsHardware stores install and maintain stove modificationsTechnical◦Design Constraints for PrototypesDoor: requires heat resistant, durable and light weight material.Secondary Combustion System: requires flexible and environmentally stable tubing.Maximize safety, comfort and ease of use and maintenance. ◦Performance Uncertainties to be TestedDoor: might not effectively insulate heat and smoke without a tight seal.Secondary Combustion System: might not produce the desired effects due to design constraints.Minimize negative overlap between subsystems.◦Difficult to acquire reliable and accurate data.Need to build a similar stove model to perform testing. Hard to quantify desirable properties such as efficiency, smoke reduction and ease of use.◦Minimize downtime and the risk of physical injury in case of malfunctions.◦Avoid causing unacceptable changes to users’ habits.Financial ◦Performance vs. cost tradeoffDoor materialQuality and quantity of secondary air tubing.Simplicity vs. effectiveness of specs.◦Economy of scale◦Minimizing overhead and maximizing value to producers.◦Possible need for sponsorship and subsidy.Logistical◦Establish partners for promotion, production, delivery and maintenance for the product and its separate components.e.g. hardware stores, cement mixers, pipe-benders, advertising and delivery personnel.◦Facilitate and effectively coordinate operations and communication among stakeholders.◦Increasing complexity with increasing scale.Perform more research◦Contact hardware store with questions◦Contact cement mason in Pasajquim◦Contact adobe mason near TPSTest and Analyze Data◦Build a stoveIterate Development◦Build a prototypeLearn to use adobe◦Learn and RepeatUsed the teamwork rating form from Jeff Kranski◦Everyone was satisfied with the load distributionEqual workClear jobs◦Punctuality can be improved (all guilty)Busy