What’s Cooking at Aprovecho

A Four-Nation Design Collaboration

On their recent trip to SSM in Shengzhou, China, Nordica and Jaden were reminded that many minds are always better than one. SSM were gracious hosts to ARC, OffgridSun from Italy, and Tango Energy from Tanzania for a week. Together, they designed a stove for Tanzania that addressed cooks’ needs, had improved performance, and could be jointly manufactured at SSM and Tango Energy. Meeting in person turned a several-month-long process of emails and phone calls into a streamlined week of design. Maybe when it comes to stove design, there is no such thing as too many cooks in the kitchen.

ETHOS 2026

The ARC team attended another successful ETHOS conference, this year in Portland, Oregon. Sam and Dean hosted Stoves 101, providing a valuable crash course in cookstove design. We also presented on the effects of forced air in stoves, LEMS testing around the world, RTKC capacity building, and much more. ETHOS is always a great time for us to reflect on the work we did and what we learned throughout the year. It’s also wonderful to see what everyone else is working on.

LEMS Around the World: Now in Burundi

Our mission to ensure everywhere has the capability to perform stove emission testing continues. Sam traveled to Burundi where he set up a LEMS and trained (in French) a team at the Laboratoire de Biomasse et de Cuisson Propre et Économe/Université du Burundi. Over 10 ISO tests on various stove types were run with the lab team as well as lab CCTs, a vital test to measure stove performance while performing a cooking task. ARC is now working to add CCT capabilities to their open-source data processing software.

Working in another language takes patience but it allows ARC to work in cross-cultural settings where lab testing, stove design, and market testing come together.


What’s Cooking at Aprovecho

Aprovecho Visits Tanzania

In September, Jaden traveled to Tanzania to help set up a LEMS at the Bureau of Standards. Tanzania plans to set minimum standards for biomass stoves on the market, ensuring that more clean and efficient stoves are sold. She also visited Tango Energy, a stove manufacturer with whom Aprovecho has worked on stove design. She got to work on building knowledge with them and visited a project site to talk to households about their experience with improved stoves. We are excited to establish such great connections in Tanzania and hope to work with them in the future.

Increased Support for RTKCs

Regional Testing and Knowledge Centers (RTKCs) help us with testing, design, fieldwork and valuable knowledge of local cooking practices. Without them, we would not be able to make the global impact we do today. With our new grant funding, we will be supporting RTKCs in an effort to increase their testing and design capabilities, as well as building a better-connected community of testing centers and their researchers.

Test Results To Be Published

We performed a field study in Oregon on cordwood heating stoves, with the goal of understanding how people use these stoves so we can make cleaner-burning designs that still meet user needs. The results from that study are on their way to publication. This paper combines anthropology and engineering, using survey data, semi-structured interviews, and emissions data to find common usage patterns and identify high-emissions events. This work has helped immensely in our development of new cordwood heating stoves. The full paper has been accepted for publication in the Journal Energy Research and Social Science with the title: Considering the user: An integrated assessment of residential wood heating practices in the United States and implications for wood heater design. We will publish a link on our publications page, once it is available.

What a Great Year!

Regional Testing and Knowledge Centers

ARC just received a grant to hire full time assistance for the Regional Testing and Knowledge Centers (RTKC). Many of the RTKCs use our emission equipment. Jaden has just returned from Tanzania where she was setting up a new lab and Travis is going to Mozambique soon to do the same thing. Over 100 emission boxes have been sold worldwide.

The Clean Cooking Alliance lists 38 RTKCs. What an amazing resource!

It’s great to have a dedicated person available so anyone with a problem can get immediate help. The new hire will learn by testing every day, crunching the numbers with Jaden’s Python software, cleaning the equipment, calibrating it, etc. Sam and Jaden are here to help with complicated problems.

Maybe Travis, Kim and I can help with iterative development of improved stoves?

What a great year!

Introducing CPC in Bolivia

A major accomplishment of the past few years has been the creation of thirty Regional Testing and Knowledge Centers (RTKCs). Many of these facilities rely on emissions equipment and training from Aprovecho Research Center. They are usually created as an addition to a university in a developing country, and were initially funded by large development organizations such as the Global Alliance for Clean Cookstoves.

Once a month we’re turning our newsletter over to Sam Bentson, to tell you more about their activities:

Hello to everyone at the Regional Knowledge and Testing Centers (RTKCs), and to our newsletter readers, from Sam Bentson, General Manager at Aprovecho!

Sam was recently in Ghana and Senegal and then visited the Instituto de Investigación y Desarrollo de Procesos Químicos (CPC) in La Paz, Bolivia helping with stove testing and their LEMS emission hood. La Paz has the highest elevation of any government city in the world at an altitude of 3,650m!

The atmospheric pressure at CPC in La Paz is 20Hg. Our lab in Oregon is 241 meters above sea level where the atmospheric pressure is 30Hg. Sam and the CPC staff determined that at their high elevation, and with the voltage applied to the Jet-Flame motor increased to 8V, the mass flow in the Jet-Flame was 82% of the mass flow measured at the ARC lab.

Altitude had a big effect on boiling water and on the Jet-Flame!

CPC in La Paz, Bolivia from left to right: Libertad Mariana Casanova Velasquez, Dalia A. Borja, Sam Bentson, Jazmin Gidari Ruiz Mayta, and Karen Fabiana Paz Quispe

When Sam returned home, he started thinking about keeping in touch with all of his friends at the RTKCs and to share reports of activities. We are starting with CPC and highly recommend that anyone interested in doing research or a stove project make use of this wonderful resource in Bolivia!

Contact:

Marcelo Gorritty
Email: mgorritty@gmail.com
Calle Campos, Esq. Pasaje Villegas.
Edificio Artemis 367. PB Of. 7
La Paz, Boliviawww.cpc-bolivia.org