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2014 Heater Fuel Tests at Shawville

Test HK-M27
March 9, 2014

Red oak cordwood. Small wood, wetter than HK-M26
Side ignition.  Newspaper 3/4 up the kindling pile.
67.8 lbs including 6.0 lbs kindling
22.9% moisture.

Stack temperature corrected for height.
Pisla HTT 602 door, 22" wide
Austrian eco firebox, see
Custom air frame, setup "D"
Rear grate closed

Condar Spreadsheet Results
Condar spreadsheet results, calculated at 140 minutes.

Condar Spreadsheet 

Animation,  5 minute intervals.  Newspaper is located 3/4 up the kindling stack. Sequence goes to 170 minutes.

See burn videos, below.

gas analysis
Flue gas graph to 140 minutes. Pile did not collapse. There was a poke at 138 minutes, and all the wood was
reduced to charcoal, even the two bottom logs.
When bottom logs are too large, they get drowned in coal and don't burn.

TESTO Excel data file

Testo graph
Testo gas graph, entire cyle.
Notice the  CO drop at 1:03 PM, when the pile is poked.

Opacity graph. 
Compare with the opacity graph for HK-M26.
HK-M26 had a faster start because of a lower piece of newspaper at the front,resulting in less staging and more of an initial spike.
Note that there is usually an immediate very short spike lasting a few seconds.
Because the Condar is constant flow sampling instead of proportional flow (EPA dilution tunnel), it over-estimates the PM at the beginning, when flow is low.
We can very reliably predict that an EPA number will be slightly lower than a Condar number - this allows the Condar
to be used with less precision, yet still give reliable pre-certification estimates before going to an accredited lab for certification testing.


Red oak cordwood with bark left on.  Largest pieces were placed at the bottom, smallest pieces at the top.

Stacked in firebox

Burn sequence to 180 minutes


This page was updated on March 9, 2014
This page was created on March 9, 2014