Entries by Kim Still

Clean Burning Also Necessary for Biomass Home Heating

Since 1976, ARC has been investigating how to improve heat transfer and combustion efficiency in Low Middle Income Countries’ wood burning cook stoves. Emissions of Particulate Matter have been shown to kill millions of people annually. PM concentrations are frighteningly high in homes without chimneys but emissions into outdoor air are an increasing health/climate concern. […]

Using Air Changes to Meet ISO PM2.5 Performance Targets

Almost 20 years ago, ARC was invited to a conference in Bonn, Germany to consider standards for cook stoves including emissions. In preparation, we met with Dr. Kirk Smith and his protégés at the University of California at Berkeley. We discussed the beneficial effect of increased air exchanges that decrease the concentrations of CO and […]

Secondary Air in TLUDs and Rocket Stoves

Forced draft mixing with preheated jets of primary air reduced emissions of PM 2.5 by around 90% in our stove tests with the Jet-Flame. Would adding secondary air jets further decrease emissions? Secondary Air Works in TLUDs Lefebvre, Vanormelingen, and Udesen examined secondary air jets air in cylindrical combustion chambers and describe most successful patterns […]

Win a Rainbow Coalition of Friends

The ARC lab is located in the Oregon woods where “hippies” and “rednecks” live on small farms in approximately equal numbers and share numerous points of view. I learned about these overlapping values when I accompanied my Dad, a Christian community organizer, to pot-luck meetings at nearby Granges, members of a farmers’ association organized in […]

Ethanol or Direct Burning for Heating Applications?

The direct burning of biomass seems to be dramatically more efficient compared to ethanol for applications such as home heating, cooking, heating water, or drying clothes. It makes sense that not having to create alcohol from biomass would save energy. When the use of natural gas is decreased (due to climate change), burning biomass for […]