The document discusses the design of an energy efficient stove for rural households. It outlines limitations of existing stove designs such as lack of secondary heat storage, safety issues, and inefficient heating times. The proposed new stove design aims to be safe, user-friendly, portable, able to use different biomass fuels, and provide both primary and secondary cooking functions through a heat transferring medium like oil. Key factors to consider in the detailed design include safety, various cooking functions, ergonomics, and making the stove affordable for the target market. Research on existing efficient stove models from other countries is being conducted to inform the new design.
2. DESIGN THAT MATTERS
EnergyEfficientStove
Product Background
Some characteristics of the original product are:
• Water is used to transfer heat for secondary use from prim
ary burner
• Flexible pipe is used to divert heat to another vessel or to
the same vessel.
3. DESIGN THAT MATTERS
EnergyEfficientStove
Some limitations of the existing product are:
•No secondary heat storaNot formally marketable
•ge facility – no secondary use for steam
•Factor of safety is low – open circuit
•Time to achieve steam is long
•Water doesn't retain heat for long
•Problem of maintaining water level
•Corrosion
•Scaling problems
4. DESIGN THAT MATTERS
EnergyEfficientStove
Product Design Brief
To design a multi functional energy efficient stove
using “single burner double stove" principle for
the rural household
The product should be:
safe
user friendly
portable
able to use different kinds of biomass
Indian
5. DESIGN THAT MATTERS
EnergyEfficientStove
Data collection
RESEARCH
Looking at various models of "energy efficient
" stoves over the world, and seeing "local" sol
utions to similar problems.
• use of local materials
• harnessing maximum energy
• looking at conventional cooking spaces
• looking at varied needs / requirements
of end user
• different functional attributes
The other countries that have s
imilar products are:
• Kenya
• Ethiopia
• Sri Lanka
• China
6. DESIGN THAT MATTERS
EnergyEfficientStove
The other component of research inclu
des the study of different materials tha
t can be used for the product.
Some of the materials are:
• oils
• ceramics
• metals
• pipes
• insulation
• fuel
9. DESIGN THAT MATTERS
EnergyEfficientStove
Factors to be considered for detailed design
SAFETY
• safety from open fire
• pipe explosion
• burning of biomass
• leakage of oil
• clogging of oil inside closed circuit
• oil level should be maintained
• thermal insulation
• flash point of oil shouldn't be too low
• stability of stove
• hot plate
• smoke free
• no sharp edges
10. DESIGN THAT MATTERS
EnergyEfficientStove FUNCTIONS
• to satisfy conditions of primary and secondary
cooking
• ability to accommodate different sizes of vessel
s
• to use maximum amount of the generated heat
• portable
• stable
• easy ash removal
• blowing device
• ability to use different types of biomass - firewood,
charcoal, coconut shells, compost, dry leaves,
cow dung cakes
• temperature indicator
• hot plate function
• hot plate surface quality
• cleaning
• non stick surface
• flue gases directed away from user
• flue gases used for secondary heating device
11. DESIGN THAT MATTERS
EnergyEfficientStove
ERGONOMICS
• physical/visual ergonomics
• height for reasonable access
• smokeless
• right weight for portability
• prominent placement of indicators
• handles for lifting
• dimensions of stove
• distance between plates
• shape of pipe for ideal flow
• materials used - use of local materi
als,
availability, production techniques,
color, texture
• cultural attitude of cooking
12. DESIGN THAT MATTERS
EnergyEfficientStove
MARKET
• cost - cost efficient, affordable
• packaging - should emphasize "efficiency" of
stove, include instructions for use
• production - mass produced, materials, reductio
n in
cost, advertising
• technology
• manufacture
• distribution
• retail
• disposal
• recycling
17. DESIGN THAT MATTERS
EnergyEfficientStove
Attributes
Protection from open fire
Preventing oil leakage
Maintaining oil pressure
Maintaining oil level
Protection from hot surface
Maintaining stability
To satisfy conditions/functions of pri
mary and secondary cooking
Portability
To accommodate different vessel siz
es
Removal of ash