Post on 31-Mar-2018
Next Generation Charcoal Stove for Haiti
Team P12242
Marissa Blockus, Brandon Harbridge, Sam Huynh, Brianna Stephenson-Vallot, Dustin Tyler
Team Members
• Brandon Harbridge (IE) – Team Lead
• Samantha Huynh (ME) – Lead Engineer
• Marissa Blockus (ME) – Team Facilitator
• Brianna Stephenson-Vallot (ME) – Team Engineer
• Dustin Tyler (ME) – Team Engineer
Customer Needs Need Importance Description Notes
1 9 Affordable (initial cost <$10 at high production)
2 9 Requires less fuel for same cooking tasks
3 9 Reduced CO emissions
4 3 Reduced PM emissions
5 3 Easy to operate (little user interaction and intuitive processes)
6 9 Same or improved cooking controls
7 9 Obtain rapid boil quickly and then bring to simmer
8 9 Able to be fabricated and assembled using Haitian artisan practices
9 3 Transportable (able to be moved by a single Haitian adult 500 m)
10 3 Rugged (can handle being dropped and withstand harsh conditions)
11 9 Durable - lifetime of five or more years Used twice a day
12 3 Have simple, cheap and easily replaceable parts
13 9 Thermoelectric module will not fail due to high termperature and gradients
14 9 Safe to operate
15 9 Maintain appropriate temperature gradient across thermoelectric module
16 9 Achieve Desired temperature gradient quickly
Importance Scale: 1 - low importance, 3 moderate importance, 9 high importance
Engineering Specifications Eng Spec
Description Importance Units Marginal
Value Ideal Value
Relates to Cust Needs
Notes
1 Cost 9 $ <$10 <$10 1
2 Assembly time 3 min < 3 < 3 12,8
3 Fuel reduction 9 kg 50% >50% 2,3
4 CO reduction 9 g 25% >50% 3
5 PM reduction 3 g 25% >55% 4
6 Time to boil time reduction
9 min 25% >25% 7
7 Maximum Surface Temperature
1 °C < °50 C < °40 C 14
8 Time to boil for Modified WBT
3 min < 15 < 8 7,6
9 Range of heat output 3 kW 1 - 6 .8 - 6.2 7
10 Capable pot diameters
3 cm 20 - 60 15 - 65 5,6
11 Withstand pot mass 9 kg 25 30 5,6
12 Five or less tasks to maintain fire
3 tasks 5 < 5 5,6
13 Replacement: Part cost
3 $ 3 < 3 12
Engineering Specifications Cont’d Eng Spec
Description Importance Units Marginal
Value Ideal Value
Relates to Cust Needs
Notes
14 Replacement: Time req’d 1 min 60 < 60 8,12
15 Replacement: Tools req’d 3 - - - 8 Simple Haitian hand tools
16 Stove overall mass 3 kg 8 8 1
17 Stove volume 1 m^3 0.2 < 0.2 1
18 Stove construction 9 - - - 8 Simple Haitian hand tools
19 Survive 20 x 2m drop tests 3 drop tests 20 20 10,11
20 Ergonomics metrics 3 - - - 8,9,10,14
21 Minimum temperature gradient across TE
9 °C 200 200 15 Under peak conditions
22 Quickly reach temp gradient
9 min 20 15 16
23 Stove electrical consump. 9 W .6 - 1 <.9 13
24 Max thermoelectric temperature on hot side
9 °C 380 (400) 380 15 380°C continuously and 400°C intermittently
25 Max TE temp on cold side 9 °C 200 200 15
26
TE module is mechanically loaded evenly & does not exceed module failure limit
9 - - - 15
System Energy Flow
Morphological Chart Functions Possible Solutions
Maintain Temperature Difference
Heat Sink
Forced Air
Damper System
Remain Under Specified Temperature Reduced Air Speed
Transfer Energy from TE Heat Sink
Liquid Cooling
Convert Heat into Electricity Thermoelectric
Regulate Rate of Fuel Burn Forced Air
Control Amount of Directed Heat Forced Air
Sleeve Surrounding Pot
Mount and Locate TE Stove Body Modification - Partition
Associated Risks
System, Materials and Manufacturing, TEG, Fan and Conducting Rod Risks
TEG Testing Results
Tests Completed on 1/11/11
Future Plans
• The arm mounting the thermoelectric will be shortened and have a taper to regulate temperature gradient.
• Raise the location of the extended surface to decrease time lapse for thermoelectric temperature requirement.
• Reposition wiring location for thermoelectric data acquisition.
• Change geometry of stove for better heat distribution, introduction of partition.
Questions?