ETHOS 2005 Summer Camp August 21-27, 2005

Dean Still, Aprovecho, August 2005


You'll find attached the results from the Stove Competition held at Aprovecho.



The results are summarized in four categories:

1.) Time to boil 5 liters of water

2.) Fuel to 'cook' per liter (Bring 5 liters to boil, simmer for 30 minutes)

3.) Carbon Monoxide made per liter of water boiled and simmered for 30 minutes

4.) Particulate Matter made per liter of water boiled and simmered for 30 minutes

1.) There is a large difference in the time it takes for stoves to boil 5 liters of water. The slowest stove took 50 minutes while the fastest took less than ten minutes. Stoves with skirts, where the hot flue gases are forced to scrape against the bottom and sides of the pot, are more successful in this category. For instance, Paul Anderson's T-LUD stove used a skirt in the first test but not in the second. The Institutional Rocket uses a very large pot which gives it an important advantage.

2.) Three stoves used less than 100 grams of wood (kiln dried Douglas fir) per liter to boil 5 liters of water and then simmer the remaining water for 30 minutes. Four stoves were grouped around 150g/l. Again stoves with skirts around the pot used less wood.

3.)Paul Anderson's T-LUD stove was very successful at high power in decreasing emissions, both CO and PM. Five of the stoves made about half the CO compared to other stoves in the competition. The Institutional Rocket stove, similar to stoves being made by GTZ and WFP, made less than one g/L.

4.) Again, at high power the T-LUD was impressive in reducing PM. Ken Goyer's Rocket stove made about 25 mg/L. The second best stove, made by Dale Andreatta, emitted about 75 mg/L.

This was fun and we all learned a lot! As soon as the numbers are ready we will be sending on results from comparing systems that measure emissions.

An hour long video was shot at Stove Camp which will be available when it is finished.

Thanks to Shell Foundation for their support.



Dean Still
Aprovecho Research Center

Ken's Rocket with Insulated skirt
Orjina's Bangladesh Mud Stove
WFP-310 Rocket with 310 Stainless Steel combustion chamber and skirt
TLUD Top Lit Updraft With Ken's Insulated Skirt No Chimney
Ethiopian (Concrete) Rocket Stove
Dale's Stove
Institutional Rocket Stove with 310 Stainless Rocket Elbow
Lutfiyah's Improved Orjina Stove

Paul's T-LUD with Chimney No-skirt
Priyagni Wood Stove


Ken's Rocket - (Aprovecho) typical rocket with insulated skirt developed by Ken Goyer

Orjina's Bangladesh Mud Stove - (PCIA) Mud stove submitted for testing and improved at Camp by Lutifyah.

The Bangladesh mud stove is constructed by a local woman at the PCIA household energy and IAP pilot project in Bangladesh . (See PCIA Partner Profile: Village Education Resource Center) The pilot is funded by USAID and aims to reduce exposure to IAP through behavioral and household energy improvements. Our aim is to develop an intervention 'model' which will be replicable and scalable. The woman who made this stove, Orjina, had received some rudimentary training in stove efficiency principles from the government agency which spear-headed the improved stoves program in the 1980s/90s. That program has now ended. As part of our pilot, we want to encourage women like Orjina to construct and sell stoves which are actually improved in terms of exposure as well as emissions. Lutfiyah brought back one of her stoves to have it tested and to see what improvements can be made. The testing at Apro was great because it gives us some sense of how well this stove compares to other stoves.

Lutfiyah's Improved Orjina Stove - (Aprovecho Camp)

Dean suggested that we include a rocket combustion chamber while trying to keep the exterior pretty much the same. Thus originated 'Lutfiyah's improved stove' (which should actually be called 'Orjina's improved stove'). In any case, the tests showed positive results in terms of time to boil, fuel used, CO..However we still need to work on the PM emissions. As expected just one trial run is not adequate - we will probably have to tweak and test the design some more. Some of the immediate observations were that the combustion chamber needs to be wider to allow women to use cow dung and briquettes and the mixture of the packing material should be dry. We didn't have enough time to sun dry the stove properly.

Lutifyah's plan is to share her findings with local PCIA partners so that they can start to identify brick makers, raw materials, suitability of design etc. 

WFP-310 Rocket - (Aprovecho Camp) World Food Program rocket developed in Aprovecho Camp and tested in Africa (2004). Damon has been experimenting with better metals like 310 stainless steel.

TLUD - (Juntos Stoves) Top lit updraft gasifying stove tested with Ken's insulated skirt and no chimney, developed by Paul Anderson. Paul has eliminated the tuyeres in this design and gone to a simple mixing throat.

Paul's TLUD - (Juntos Stoves) Top lit updraft gasifying stove developed by Paul Anderson tested with chimney and no skirt.

Ethiopian Concrete Rocket Stove - (____________)

Dale's Stove - (Aprovecho Camp) stove developed at camp by Dale Andreatta

Institutional Rocket Stove with 310 Stainless Rocket Elbow - (Aprovecho)

Priyagni ("Beloved Fire") stove - (ARTI) improved wood burning portable cast iron stove developed by the Rural Energy Laboratory of Central Power Research Institute, Bangalore, India

1. Group Photo
2. Introductions Day 1 3. Ken Preparing Fuel
4. Nordica and Lutfiyah installing emissions equipment 5. Nordica, David, Chris, Damon at Hood Test
6. Pot and Test equipment 7. Outside Smoke Chamber for Instruments
8. Instruments in Chamber 9. Ken Feeding Stove with Damon and  Steve Monitoring Results
10. Larry, Mouhsine and Lutfiyah Discuss Fundamentals 11. Mouhsine and Larry Modifying Honduran (TWP) Ceramic Rocket
12. TWP "Ecolenca, Ceramic Rocket, With Insulation 13. Mouhsine, Dean, Nate Catching Up
14. ___, Nate and Paul Assembling the TLUD 15. ____, ___ and David
16. Steve and Nate 17. Tami Contemplating Results
18. The TWP Ceramic Stove with Test pot 19. Clay Creations
20. The Data logger 21. Dale Leads Seminar
22. David and Lutfiyah testing Ethiopian Concrete Rocket Stove 23. Nate Discusses Safety
24. Mouhsine tries On Safety Hood in Test Kitchen 25. Test Kitchen
26. Nordica and Dean Discuss Ventilation Test Results 27. Paul Demonstated Tetrapak RHC and CEDESOL Frame
28. TLUD Top Lit Updraft Assembly and Fuel Chamber 29. TLUD Mixing Throat
30. TLUD Gas Combustion Chamber 31. TLUD Primary Air Control
32. Paul With the TLUD 33. Peter Demonstrating the Perfect Gas Laws
34. Meeting With Cottage Grove Community 35. Cottage Grove Community Potluck
36. CEDESOL Bolivia RHC (Retained Heat Cooker)  without top 37. Orjina's Bangladesh Stove Submitted for Development and Test
38. Steve Cutting Mold for Improved Orjina Mud Stove 39. Enthusiastic Participants Preparing Clay
40. Mouhsine Master Clay Mixer 41. Dean and Steve Packing the Mold
42. Dean Applies Surface Coat 43. Dean Making Finishing Touches. Note Grate
44. Mike Checking the Gap 45. Lutifyah's Improved Orjina Bangladesh Stove

ETHOS Stoves Summer Camp Report 2004, Dean Still ,September 2004

ETHOS Fall Seminar November 2003

ETHOS Stove Design and Testing Seminar June 2-6, 2003, Aprovecho Research Center, Oregon
  • Summary and Results (pdf) from the Seminar, Dean Still (June 18, 2003)
  • Camp Attendees

    Attendee Organization
    Lutfiyah Ahmed Winrock/PCIA
    Paul Anderson Juntos Gasifier Stoves
    Dale Andreatta SEA Limited
    Tami Bond Bond Research Group, University of Illinois Urbana Champaign
    Chris Roden Bond Research Group, University of Illinois Urbana Champaign
    Jeremy Foster Aprovecho Research Center
    Ken Goyer Aprovecho Research Center and AID Uganda
    Steve Gent Iowa State University
    Mike Hatfield Aprovecho Research Center
    Nordica Hudelson Aprovecho Research Center
    Nate Johnson Iowa State University
    Damon Ogle Aprovecho Research Center
    David Pennise Center for Enterpreneurship in International Health and Development ,UC Berkeley
    Jeremy Roth Aprovecho Research Center
    Mouhsine Serrar Sunsmile, Morroco
    Dean Still Aprovecho Research Center
    Larry Winiarski Aprovecho Research Center