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Dana Levine Maritza Ruiz León Liu Daniel Talancón Esteban Mendoza. Stove Improvement. Summary of Research. 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

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dana levine maritza ruiz le n liu daniel talanc n esteban mendoza
Dana Levine

Maritza Ruiz

León Liu

Daniel Talancón

Esteban Mendoza

Stove Improvement

summary of research
Summary of Research
  • 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
design motivation
Design Motivation
  • 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
refined engineering specs
Refined Engineering Specs
  • Door assembly
    • Dimensions:
      • 5”x22”x2” solid
    • Material: Adobe Clay
      • Reinforced with straw
    • Rigidly mounted on 2 bricks
      • 6.5x11x23 (cm)

Figure showing

Primary air intake

And door assembly

refined engineering specs5
Refined Engineering Specs
  • 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 sizes

Figure with semi-

perforated

U-bent pipes

physical interactions
Physical Interactions
  • 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
functional interactions
Functional Interactions
  • 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
functional interactions cont d
Functional Interactions (cont’d)
  • 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
prototype development and testing
Prototype Development and Testing
  • 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
key business goals manufacturing
Key Business Goals:Manufacturing
  • 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
key business goals marketing
Key Business Goals: Marketing
  • 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
key business goals sustainability
Key Business Goals: Sustainability
  • 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
proposed business plan
Proposed Business Plan
  • Partner with central hardware stores
    • Provide services to multiple villages
  • Supply stove improvement kits
    • With replacement parts
  • Hardware stores install and maintain stove modifications
challenges
Challenges
  • 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.
challenges cont d
Challenges (cont’d)
  • 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.
challenges cont d16
Challenges (cont’d)
  • 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.
challenges cont d17
Challenges (cont’d)
  • 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.
address the challenges
Address the Challenges
  • 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
teamwork
Teamwork
  • 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 schedules