The Side-Feed Fan StoveThe Side-Feed Fan Stove

Nordica MacCarty Jonathan CedarNordica MacCarty Jonathan Cedar&

Tests in our laboratory have shown Forced Air/ Fan Stoves to be the most promising tech:

Global Warming Potential due to Products of Incomplete Combustion

grams CO2 equivalent per liter of water boiled and simmered 30 minutes

300

350

normalized for starting temperatures and fuel moisture content Easy to use Fast Fuel Efficient

150

200

250

300

Global Warming Potential (g CO2

equivalent/L)

PM--680*ECPM -- -50*OM12*NMHC3*CO

Fuel Efficient 95% PM reduction Low CO emission

-50

0

50

100equivalent/L)

296*N2O21*Methane

Low CO emission Minimal Black Carbon

50Three Stone

FireRocket Fan Gasifier Charcoal

B t t d l bBut current models can be troublesome to user….

Small pieces of fuel fed under pot– Time consuming – Possibly expensive if special fuel is required

D– Dangerous If fan/TEG/circuitry breaks, stove can not

functionfunction Expensive Metal burning up/corroding Metal burning up/corroding

What is the most appropriate solution?

KISS/Occam’s RazorU i ti d d t– Use an existing, mass-produced stove Side feed rocket uses normal-sized fuel

– Ceramic combustion chamber Will solve corrosion troubles

– Find a place where ONE air inlet will work Eliminates need for complicated sealed air flow Eliminates need for complicated sealed air flow

path/higher powered blowers– So, after many evenings and weekends of

experimenting with fan power and locationexperimenting with fan power and location….

The Result

The StoveTec wood/charcoal stove with bl i j ti i b th fiblower injecting air above the fire.

Performance

Three-Stone StoveTec StoveTec Rocket with

Fire Rocket FanFuel (g) 1253 757 722CO (g) 65 17 6CO (g) 65 17 6

PM (mg) 2363 1207 151Fuel use and emissions to complete the 5 liter WBT

The Rocket with Fan reduces fuel use by 42%, CO emission by 91% and PM emission by 94% compared to the three stone fire!

Black carbon is also substantially reduced, essentially eliminated!

Power Supply and Cost

Stove can be powered using grid electricity in Cost $ Plug- TEGusing grid electricity in communities where available.

If the power is out it’s

$ gIn

Stove $10 $10– If the power is out, it s

still a rocket stove! Or can be powered

using TEG partnering

BodyFan Module

$2 $9using TEG, partnering with Biolite

– Self-contained unit

ModuleTotal Cost

$12 $19

Costs are estimates only.

Moving forward with project…

Field Studies and design refinement taking place in 2010place in 2010

Will be available for sale through StoveTec when readywhen ready

We are eager to receive feedback from cooks

Contact us if you would like to have stoves for field studies in your area

TECHNOLOGY :: energy production

5,000 wattsproduced

1 wattrequiredproduced required

9

TECHNOLOGY :: energy production

5,000 wattsavailable

1 wattrequiredThermoelectricavailable requiredThermoelectric

Module

10

TECHNOLOGY :: core technology

Direct Conduction System(international patents pending)( p p g)

Combustion Chamber

Fan

Combustion Chamber

Heat Sink

Thermoelectric Generator(TEG)

Heat Conducting Probe

TECHNOLOGY :: system benefits

Minimizes TEG cost• probe conducts optimal amount of p pheat to TEG

Fast startupb h t i kl b it i• probe heats quickly because it is near

to initial heat source

EfficientEfficient• fan cools heat sink• heat sink pre-warms air• waste heat returned to system

Applicable to many stove designs• not dependant on a conductive burn chamberc a be• can be a modular component

TECHNOLOGY :: product development

13

TECHNOLOGY :: camping stove

Field Testing

Stove Collapses for Travel

14

ROCKET STOVE :: collaboration

ltProven rocket stove Thermoelectric fan

result• 1/10th smoke of• Proven rocket stove

• Nordica MacCarty’s patent-pending secondary air system

• Thermoelectric fan system• System modeling and prototype

• 1/10th smoke of basic rocket stove• No plugs or batteries required

15

secondary air system and prototype fabrication

required

ROCKET STOVE :: gas mixingforced air promotes superior mixing

natural draft forced airnatural draft forced air

ROCKET STOVE :: performance (%)

80.0%

100.0% 42% Fuel Reduction91% CO reduction94% PM R d ti

60.4%57.6%

48.9% 49.0%51.1%60.0% Fuel (g)

CO ( )

94% PM Reduction

26.2%

20 0%

40.0%

CO (g)

PM (mg)

8.7% 8.9% 8.8%6.4%

4.1%

12.4%

0.0%

20.0%

Three‐Stone Fire StoveTec Rocket StoveTec Rocket with  StoveTec Rocket with  Alternate TEG Fan TEG Fan TEG fan and skirt Stove

ROCKET STOVE :: design explorationA Bexploration

cept

A

cept

B

conc

conc

18

CO-BENEFIT :: electricity accessCogeneration of electricity

19

LED lighting, cell phone charging, radio and more.

CO-BENEFIT :: monitoringTE d i l itTE powered wireless use monitors

• Working with UC Berkeley to develop thermoelectrically powered SUMS monitorsthermoelectrically powered SUMS monitors.

• installed in 1/100 stoves• transmits data to cellular device

• Opportunities• monitor adoption• verify carbon credits• indicate maintenance needs• indicate maintenance needs

2.5

3.0

3.5

120 0

140.0

160.0

180.0

TE Temp (HOT)

1.0

1.5

2.0

40.0

60.0

80.0

100.0

120.0Electronics Temp

TE Voltage

20

0.0

0.5

0.0

20.0

Time 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0

CONCLUSIONS :: product offerings

• TE works for clean emissions.• CoGeneration presents an opportunity to encourage

t b l tconsumers to buy clean stoves.• Power is scalable at $2-4 / watt.

$$20 for clean stove $30 for clean stove + LED

21

CONTACT :: more info

Thank Youfor more information:

Contact:Contact:

Jonathan Cedarjonathan@biolitestove.com

914.645.5149

Nordica MacCartynordica.maccarty@gmail.com

541.767.0287

22

www.BioLiteStove.comwww.Aprovecho.org