First page of the Workshop archive.

Rookie Wood Stove Makers Get Highest Score in Design Workshop

Posted by Earth Stove on July 22, 2015 with No Commentsas , , , , , , ,

Taylor Myers and Ryan
Fisher with the Mulciber,
the highest ranking stove.
A stove designed and built by graduate engineering students received the 
highest score in an international Stove Design Workshop focused on automated wood stove technology.  The goal of the event was to assess innovative technologies that can help stoves reduce real-world emissions that result from poor operation by the consumer and use of unseasoned wood, both of which are widespread problems. 

Ten judges scored the stoves based on emissions, efficiency, innovation, market appeal and safety.  The highest scoring stove, the Mulciber, adapted emission control techniques that are in automobiles, such as an oxygen sensor that controls the fuel-to-air ratio, a continuously engaged catalyst and an exhaust gas fan.  The Mulciber was also tested with unseasoned, 50% moisture content wood and performed quite well.   The team, who had never built a stove before the 2013 Wood Stove Decathlon, overhauled their first prototype and have now formed the company MF Fire to bring the stove to market.  

The Workshop was held at the DOE’s Brookhaven National Laboratory in New York and brought together a diverse range of stakeholders – students, professors, industry, regulators, air quality experts – who spent a week together analyzing the problems and solutions to residential cord wood emissions.

Five stoves competed in the event, which is part of the ongoing Wood Stove Design Challenge run by the non-profit group, Alliance for Green Heat. In 2013, the Design Challenge hosted the Wood Stove Decathlon on the National Mall in Washington DC, a high profile event modeled after the Solar Decathlon.  This year, the event was at a lab so that stoves could be tested more rigorously and test data could be shared with the participants.

The core problem is that most consumers do not operate wood stoves well and many use unseasoned wood.  In addition, EPA certification testing for wood stoves do not simulate how wood is burned in people’s homes.  For decades, manufacturers have been building stoves to pass that test, but not necessarily to burn cleanly in homes.  This workshop addressed that by testing with cordwood that was not fully seasoned, capturing some start-up emissions in the test and assessing how automation can reduce operator error.  At Brookhaven, stoves were tested at four parts of their burn cycle: warm start, steady state 1, hot reload and steady state 2. The current EPA stove certification test uses seasoned 2x4s and 4x4s and only tests for emissions after the start-up period, once the stove is hot.

Automated stoves, where computers, not consumers, adjust the air-to-fuel ratio, cannot be tested by EPA test methods so they are not able to enter the US marketplace.   A major goal of the Workshop was to start designing an alternative test method to the EPA’s method, so that automated stoves can be tested and become certified in the US, as they already are in Europe. Tom Butcher, a senior scientist at Brookhaven Lab, hosted one of the public webinars during the week on that topic.

Rankings: The judges gave double weight to emissions and efficiency, as they did in the 2013 Wood Stove Decathlon, because of the importance of those values.  This year, the judges decided not to judge affordability since most of the stoves were prototypes or technologies designed to be integrated into other stoves and ultimate costs and pricing was too speculative. Each of the 10 judges scored each stove on innovation and market appeal.  The other three criteria were based on lab tests.
“We want to congratulate the MF Fire team – and all the teams – for participating in a process of sharing innovation, ideas and test results,” said John Ackerly, coordinator of the event and President of the Alliance for Green Heat.  “These stoves have many of the solutions to excessive smoke from modern-day wood stoves and are challenging the EPA and the stove industry, to catch up with new technologies and new opportunities,” Ackerly said.

The Wittus team with the Twinfire.
While MF Fire stove, the Mulciber, had the highest combined score, several of the other stoves stood out in key areas.  The German Twinfire, designed by the Wittus team, had the second highest overall efficiency, at 74%, and one of the lowest emission rates on a test run.  Its automated air regulation enabled the stove to perform consistently well at different part of the burn cycle and it received the highest score for consumer appeal, for its downdraft flame into a lower chamber.  
The VcV, wired to monitor
temperature in key spots
The VcV, a New Zealand mechanical device that operates without any electricity, achieved the highest average efficiency, at 82% based in part on the lowest average stack temperature at 167 degrees (F), and the lowest emission rate on one of its tests.  It also received the second highest marks for innovation.  This was the only stove that did not require electricity and will be very affordable. Three out of four tests were very, very good, but on one the hot reloads, something happened and that reduced its overall numbers, and took it out of contention for first or second place.  This device has undergone extensive R&D and is one of the entries that is closest to being ready for the market.

The Catalus Ventus by ClearStak, received the highest score of all for CO reduction, and the second

The ClearStak team with the
Catalus Ventus

highest for emissions.   It was a highly innovative entry, employing dual cyclones, a pre-heated, continuously engaged catalyst and a fabric filter.  Its sensors and controller kept the oxygen rates incredibly steady, within half a percentage point. The technology could be integrated into a new stove, or added on to an existing stove. The designers did not try to optimize efficiency, which impacted their overall score.   

The Kleiss, ready for testing.
The Kleiss arrived at the competition with the hallmarks of an innovative, automated stove that could handle wet wood and nearly eliminate operator error.  The stoves sensors and algorithms were designed to maintain very hot combustion temperatures and to allow the operator to call for more of less heat, while prioritizing cleanliness.  However, the stove did not perform as expected, with secondary air contributing to primary burning with a large fuel load.   

Test results for all the stoves are available here.  (References to grams per hour are not comparable to EPA gram per hour tests since the Workshop used tougher test protocols.) A series of presentations by the stove designers about their stoves and other stove and combustion experts are also available.


The Wood Stove Design Challenge is a technology competition that also strives to bring key stakeholders together to assess and learn about new stove technology.  Primary funding came from the New York State Energy Research and Development Authority (NYSERDA), the Osprey Foundation and the US Forest Service.  Testing support was provided by Myren Labs, Masonry Heaters Association and Testo and Wohler, two German companies who are pushing the envelope of accurate real time lab and field testing of particulate matter.  The Chimney Safety Institute of America and Olympia Chimney donated the chimney installations, and Blaze King and Woodstock Soapstone also provided support.

The 12 member Organizing Committee oversaw developing protocols, testing and scoring and included representatives from Alliance for Green Heat, Aprovecho Research Lab, Brookhaven National Lab, Clarkson University, Hearth.com, Masonry Heater Association, Massachusetts Department of Energy Resources, Myren Labs, NYSERDA, US Forest Service and Washington Department of Ecology. The Committee is now considering options for a 2015 Stove Design Challenge.


Heated Up!

Rookie Wood Stove Makers Get Highest Score in Style Workshop

Posted by Earth Stove on November 27, 2014 with No Commentsas , , , , , , ,

Taylor Myers and Ryan
Fisher with the Mulciber,
the greatest rating stove.
A stove developed and constructed by graduate engineering learners acquired the&nbsp
greatest score in an global Stove Layout Workshop focused on automated wooden stove technology.&nbsp The purpose of the occasion was to evaluate modern systems that can support stoves decrease true-entire world emissions that end result from very poor operation by the customer and use of unseasoned wooden, the two of which are widespread difficulties.&nbsp

10 judges scored the stoves dependent on emissions, effectiveness, innovation, marketplace attractiveness and basic safety.&nbsp The highest scoring stove, the Mulciber, tailored emission control techniques that are in cars, these kinds of as an oxygen sensor that controls the gasoline-to-air ratio, a continuously engaged catalyst and an exhaust fuel fan. &nbspThe Mulciber was also tested with unseasoned, fifty% humidity content material wooden and done really nicely. &nbsp&nbspThe team, who experienced by no means developed a stove just before the 2013 Wood Stove Decathlon, overhauled their first prototype and have now shaped the firm&nbspMF Fireplace&nbspto bring the stove to industry. &nbsp

The Workshop was held at the DOE’s Brookhaven Nationwide Laboratory in New York and introduced jointly a assorted assortment of&nbspstakeholders – learners, professors, industry, regulators, air good quality authorities – who invested a week collectively analyzing the issues and remedies to household cord wooden emissions.

Five stoves competed in the function, which is portion of the ongoing Wooden Stove Layout Challenge run by the non-profit team, Alliance for Eco-friendly Warmth. In 2013, the Design and style Challenge hosted the Wooden Stove Decathlon on the Countrywide Mall in Washington DC, a substantial profile event modeled following the Photo voltaic Decathlon.&nbsp This yr, the occasion was at a lab so that stoves could be tested more rigorously and test info could be shared with the participants.

The core issue is that most buyers do not work wooden stoves nicely and numerous use unseasoned wooden.&nbsp In addition, EPA certification screening for wooden stoves do not simulate how wood is burned in people’s houses.&nbsp For&nbspdecades, producers have been constructing stoves to pass that check, but not always to burn cleanly in homes.&nbsp This workshop resolved that by screening with cordwood that was not totally seasoned, capturing some start off-up emissions in the test and evaluating how automation can decrease operator error.&nbsp At Brookhaven, stoves were analyzed at four areas of their melt away cycle: heat begin, steady condition one, very hot reload and constant state two. The present EPA stove certification examination makes use of seasoned 2x4s and 4x4s and only checks for emissions following the start-up interval, once the stove is sizzling.

Automatic stoves, in which computer systems, not consumers, adjust the air-to-fuel ratio, are not able to be examined by EPA check strategies so they are not in a position to enter the US market.&nbsp&nbsp A key goal of the Workshop was to start off designing an different take a look at approach to the EPA’s technique, so that automated stoves can be analyzed and grow to be licensed in the US, as they already are in Europe. Tom Butcher, a senior scientist at Brookhaven Lab, hosted one particular of the general public webinars throughout the 7 days on that subject.

Rankings:&nbspThe judges gave double excess weight to emissions and performance, as they did in the 2013 Wood Stove Decathlon, because of the value of these values.&nbsp&nbspThis 12 months, the judges made a decision not to decide affordability because most of the stoves had been prototypes or systems developed to be built-in into other stoves and supreme costs and pricing was too speculative. Each and every of the ten judges scored each stove on innovation and marketplace charm. &nbspThe other a few standards ended up dependent on lab tests.
“We want to congratulate the MF Fireplace staff – and all the groups – for taking part in a method of sharing innovation, concepts and check results,” stated John Ackerly, coordinator of the function and President of the Alliance for Inexperienced Heat.&nbsp “These stoves have many of the remedies to extreme smoke from modern day-working day wood stoves and are challenging the EPA and the stove sector, to capture up with new technologies and new possibilities,” Ackerly mentioned.

The Wittus crew with the Twinfire.
Even though MF Fireplace stove, the Mulciber, experienced the highest mixed score, numerous of the other stoves stood out in key regions.&nbsp The German Twinfire, created by the Wittus team, experienced the second highest general efficiency, at seventy four%, and a single of the cheapest emission rates on a test operate. &nbspIts automatic air regulation enabled the stove to perform regularly effectively at distinct component of the burn cycle and it gained the maximum score for consumer charm, for its downdraft flame into a lower chamber.&nbsp&nbsp
The VcV, wired to monitor
temperature in important spots
The VcV, a New Zealand mechanical device that operates without any electrical energy, reached the highest typical effectiveness, at 82% based in portion on the lowest typical stack temperature at 167 levels (F), and the most affordable emission charge on one particular of its assessments.&nbsp It also&nbspacquired the 2nd maximum marks for innovation.&nbsp This was the only stove that did not need electrical energy and will be extremely cost-effective.&nbspA few out of 4 exams were extremely, really good, but on one the scorching reloads, some thing happened and that diminished its total figures, and took it out of contention for very first or second place.&nbsp This unit has undergone extensive R&ampD and is one of the entries that is closest to becoming all set for the marketplace.

The Catalus Ventus by ClearStak, acquired the optimum score of all for CO reduction, and the second

The ClearStak staff with the
Catalus&nbspVentus

optimum for emissions.&nbsp&nbsp It was a highly progressive entry, using dual cyclones, a pre-heated, constantly engaged catalyst and a fabric filter. &nbspIts sensors and controller held the oxygen rates extremely steady, in 50 percent a percentage level. The technologies could be built-in into a new stove, or added on to an existing stove. The designers did not consider to optimize performance, which impacted their all round score. &nbsp&nbsp

The Kleiss, all set for tests.
The Kleiss arrived at the competition with the hallmarks of an modern, automatic stove that could handle soaked wooden and virtually remove operator error.&nbsp The stoves sensors and algorithms had been designed to maintain quite very hot combustion temperatures and to let the operator to call for much more of significantly less heat, although prioritizing cleanliness.&nbsp Nonetheless, the stove did not perform as predicted, with secondary air contributing to principal burning with a large gas load. &nbsp&nbsp

Examination outcomes for all the stoves are offered listed here. &nbsp(References to grams for every hour are not equivalent to EPA gram per hour exams given that the Workshop utilized harder examination protocols.) A series of shows by the stove designers about their stoves and other stove and combustion professionals are also accessible.


The Wood Stove Style Challenge is a technological innovation competitiveness that also strives to deliver crucial stakeholders together to evaluate and understand about new stove technologies. &nbspPrincipal funding came from the New York State Vitality Research and Development Authority (NYSERDA), the Osprey Foundation and the US Forest Provider.&nbsp Screening assistance was presented by Myren Labs, Masonry Heaters Affiliation and Testo and Wohler, two German businesses who are pushing the envelope of precise real time lab and field tests of particulate make a difference. &nbspThe Chimney Safety Institute of America and Olympia Chimney donated the chimney installations, and Blaze King and Woodstock Soapstone also supplied assist.

The 12 member Organizing Committee oversaw building protocols, tests and scoring and included reps from Alliance for Environmentally friendly Warmth, Aprovecho Study Lab, Brookhaven National Lab, Clarkson College, Hearth.com, Masonry Heater Association, Massachusetts Department of Power Assets, Myren Labs, NYSERDA, US Forest Support and Washington Department of Ecology. The Committee is now contemplating possibilities for a 2015 Stove Design Problem.


Heated Up!

Photograph Album of the 2014 Collaborative Stove Design and style Workshop

Posted by Earth Stove on November 5, 2014 with No Commentsas , , , , , , ,

Ivana Sirovica, Jessica Peterson and Jeff Hallowell, from ClearStak&nbspBrookhaven Countrywide Laboratory. Rebecca raking coal mattress to put together for the next load of gas.&nbsp Thanks to John Pilger and Chimney Safety Institute of America and Olympia Chimney for donating pipe and installation! Taylor Myers showing a actual time electronic show, using bluetooth, of temperatures in […]

Collaborative Stove Design and style Workshop Announcement

Posted by Earth Stove on May 26, 2014 with No Commentsas , , , , ,

The Collaborative Wooden Stove Design Workshop to be held Nov. 4 – 7, 2014 is a gathering of stove professionals to examine, take a look at, and talk about innovative wooden stove types.&nbsp The Workshop will be held at Brookhaven Countrywide Laboratory in New York and will entail fingers-on stove testing, every day review of […]