[Stoves] The Aprovecho Research Center Newsletter - March 5th, 2015

Sat Mar 5 16:57:55 CST 2016

The Aprovecho Newsletter - March 5th, 2015 

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Cleaner Burning Rocket Stoves: Use a Fence? 

Rocket stoves have been shown to be much cleaner when burning at medium power ( <http://aprovecho.us3.list-manage1.com/track/click?u=6024c1562ffc2660833c676cf&id=0d5fe9930f&e=3135640788> Jetter, et al 2012,  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=4b8edad23c&e=3135640788> Agenbroad, 2010). For this reason, a fence located at the back of the combustion chamber in the new DOE funded Sunken Pot Rocket stove allows only 8cm of the tips of the sticks to burn. The outer portion of the stick remains too cold to make more wood gas. The stove is insulated with spirals of stainless and aluminum foil to increase the R-value and to decrease lost energy into the stove body. The riser tube above the combustion chamber is 10cm in diameter and the depth of the fuel magazine is shortened to 11cm. 

  <https://gallery.mailchimp.com/6024c1562ffc2660833c676cf/images/b7e73ca2-8278-4c2f-a641-8a683173dc7d.png> 

Only 8cm of the length of the sticks burn at once. 

The hot gases flow upwards past the sides of the pot in a 6mm channel gap (Seen below) and then flow down a larger space to exit out of the chimney which is located below the bottom of the pot.  The pot fits tightly in a hole cut into the stove top so no smoke escapes. Allowing only 8cm of four 1cm x 2cm sticks of wood to burn creates a firepower of about 2.7kW. This amount of flue gas can flow unimpeded through the 6mm channel gap resulting in excellent heat transfer efficiency. 

  <https://gallery.mailchimp.com/6024c1562ffc2660833c676cf/images/08607dab-9f2c-41b9-9a51-2950be907d07.png> 

The pot sinks into the stove and is surrounded by a 6mm wide channel through which the hot exhaust gasses must pass. 

When a well-insulated Rocket combustion chamber (with fence) is combined with an effective heat transfer mechanism the emissions made per liter of food cooked can be substantially reduced. At close to 50% thermal efficiency, less wood is burned to boil and simmer water and cook food. However, would medium power Rocket stoves be acceptable to cooks? Perhaps when the thermal efficiency is close to optimal the stove might cook food fast enough even though the firepower is relatively low? 

Stay tuned next time for: The ‘tier 4’ refractory ceramic side feed forced draft rocket stove! 

About 

Aprovecho Research Center (ARC) is a non-profit organization dedicated to solving the problems of  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=e90340bd14&e=3135640788> indoor air pollution and  <http://aprovecho.us3.list-manage1.com/track/click?u=6024c1562ffc2660833c676cf&id=b5874056d9&e=3135640788> fuel scarcity in developing countries related to preparing food on biomass cook stoves. It has been helping people with stove design and testing since 1976, and since 2007 has helped to create Regional Testing and Knowledge Centers ( <http://aprovecho.us3.list-manage2.com/track/click?u=6024c1562ffc2660833c676cf&id=d347d2c678&e=3135640788> RTKC) with its  <mailto:mike at aprovecho.org?subject=I'm%20interested%20in%20your%20emissions%20equipment%20and%20training%20services&body=Please%20provide%20me%20with%20more%20information%20about%20your%20emissions%20equipment%20and%20training%20services.> emissions equipment and training programs. The emissions equipment is designed and manufactured on-site and training on equipment use and applications is offered at the campus or at the prospective laboratory.

An  <mailto:mike at aprovecho.org?subject=Internship%20Program&body=Please%20provide%20me%20with%20more%20information%20about%20your%20internship%20program.> internship program is available to people from the RTKCs, or to highly qualified individuals who want to enter the field. The program is designed so that the intern gains valuable skills, helps ARC in its work, and so that a lasting partnership is built.

ARC's work is supported through the sale of its emissions equipment, testing, training, and design services, through the sale of  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=09b198d059&e=3135640788> StoveTec products, and by donations. Donations help to cover costs between sales and free the staff to pursue topics that are pertinent to ARC's  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=eac2668a3d&e=3135640788> mission. Some of those topics include developing the  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=1631b611f4&e=3135640788> testing standards that make stove evaluations repeatable and accurate, learning the  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=304aab8e27&e=3135640788> design principals of stoves so that anybody can make an improved stove, and supporting internships for people from developing countries so that they can make a lasting impact in their communities.

Aprovecho Research Center is exempt from federal income taxes under Section 501(c)(3) of the Internal Revenue Code. Your gift is tax deductible. While you can easily  <http://aprovecho.us3.list-manage.com/track/click?u=6024c1562ffc2660833c676cf&id=1324ccd57a&e=3135640788> make a donation though Paypal, please consider mailing a check so that more money gets to the people who need it most.

The problems associated with biomass cook stoves are not well known to people who don't use them. Spread the word by forwarding this message to your friends.

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Our mailing address is:
P.O. Box 1175
Cottage Grove, OR 97424
USA

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