Illustration from: Birzer et al. (2013) “An analysis of combustion from a top-lit up-draft (TLUD) cookstove”, Journal of Humanitarian Engineering 2(1):1-8 DOI:10.36479/jhe.v2i1.11 When Dr. Tom Reed and Dr. Larry Winiarski added short, narrow chimneys above the fire in TLUDs and Rocket stoves, they increased draft and created laminar flow flame in the tubes that could […]
One of the things that I like about the IWA Water Boiling Test is that it mimics the boiling and simmering functions of cooking food. Wood burning stoves are notorious for being too slow to boil big pots of water and for burning things like rice because they can’t be turned down enough to simmer. […]
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 […]
The diameter of sticks from the same species of wood (we use Douglas fir at ARC for testing) seems to have a dramatic effect on emissions and thermal efficiency. We used to use small diameter sticks of wood and experienced high thermal efficiency, low CO and high PM2.5. Small sticks make a lot of flame […]
Boiling that five liters in 25 minutes max! There have been many versions of Water Boiling Tests, including the 1987 International Standards, Shell Foundation, IWA, ISO 19867, Chinese, Indian and many others. The lab tests do not predict in-field use but are intended to compare results when variables are controlled. It can be amusing, in […]
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 […]
It’s great to have colleagues whose opinions are trusted. Dr. Larry Winiarski was usually right, by which I mean, that when we built and tested his inventions they might not have been perfect but were significant improvements, good starting places for further development. I always appreciated talking to Dr. Tom Reed, inventor of the TLUD, […]
In the middle of August, we had three stoves under development using the three emission hoods (two-forced draft, one natural draft). Sam and Travis built the natural draft hood to help improve heating stoves. Sam is thinking about making another one, number four, since we are working on more heating stoves and things can get […]
Lowering Emissions in a Short, Natural Draft TLUD The great thing about 12” high tincanium natural draft TLUDs is that they are cheap, short and powerful. Dr. Tom Reed had a dream that a billion TLUDs would protect health, save wood, etc. We wondered if an all Tier 4, affordable, stainless steel ND-TLUD might help? […]
A rat proof box When Dr. Larry Winiarski and I lived for a season at Rancho San Nicolas in Baja California Sur, Mexico we wanted to be helpful. We built cook stoves, solar cookers and other delightful inventions that we found interesting. But Larry was an insightful fellow and he started to listen to folks […]