Concentrator disk/chimney in a TLUD When I asked Google AI, “Is flow more laminar in a smaller diameter tube?” it immediately responded: “Yes, thanks for asking! A smaller diameter tube can promote more laminar flow for a given flow rate. This is because reducing the diameter of a tube increases the Reynolds number, which is a dimensionless quantity […]
Photo from TREEAID on Flickr Looking at the photo it is easy to imagine why field-testing is needed to show whether an intervention is actually saving fuel. Real life is complicated and is not replicated in a lab. The use of a Water Boiling Test to determine if new stoves are saving fuel has historically […]
In my opinion, the WBT* cannot be used, especially in the lab, to improve a biomass cook stove because all of the important field variables are not represented. A successful cook stove needs to be evolved from field tests, as we did in Southern India for the Shell Foundation. Cooks in eighteen villages kept on […]
Image from Dr. Paul Anderson’s Introduction to TChar (TLUD) Stoves for Haiti The size of the hole in the middle of the flat plate, usually round, that seals the top of the combustor in a TLUD stove has important functions. The flat plate forces air jets/flame to travel horizontally in an attempt to completely cover […]
Cooking outdoors, making hot fires, burning the tips of sticks to use less wood and breathe less smoke (photo: Clean Cooking Alliance) In 2003, Aprovecho was hired by The Shell Foundation to develop a Rocket stove in Southern India. We found a wonderful co-op of potters that was selling two-pot burnished $4 ceramic stoves with […]
Sometimes it’s too cloudy for solar drying and a wood-fired dehydrator can help with large scale food preservation. In 2002, Dr. Larry Winiarsk helped farmers in the wet mountainous region of Nicaragua to design and build a prototype wood fired dryer for cacao beans. The ARC publication “The Winiarski Wood Fired Agricultural Food Dryer,” details […]
The LEMS in Ethiopia In March, Jaden traveled to Ethiopia to assist in the installation of the LEMS and train lab technicians on ISO testing for cookstoves. 15 trainees from all over the country attended the training. The LEMS was procured by SNV and their sponsors and was given to Ethiopia’s Department of Water and […]
One of the biggest mistakes I have made was thinking that I could predict what stove would sell in a market. If only I had always followed Sam Baldwin’s advice and done market testing before manufacturing! In Southern India, as part of the 2003-6 Shell Foundation project, we had outspoken distributors who yelled in meetings […]
Thanks to Robert Fairchild for sending this reminder that what we call a “Haybox” cooker has a lot of history behind it! Of course fireless cooking methods have been used since ancient times, but fireless cookers began to be introduced to U.S. in the mid 1800s, becoming commercially manufactured and quite popular in the US […]
On the front porch of the house he built in West Eugene, Ken Goyer shows an example of the Six Brick Rocket Stove Photo by Paul Neevel for the Eugene Weekly I think about Ken making the lightweight, insulated bricks from Bailey Hill yellow clay for the Uganda submerged double pot stove in 2002. Exposing […]