Return to Lopez Labs Home Page

2009 Heater Tests at Shawville

Test HK-K19
February 8/09

Slightly warm heater - damper had been left open, ashbox air control closed. No seal on doors.
White Birch, 20% moisture
Small wood, 11 pieces, 4.5 lbs kindling, 64.2 lbs total
Pieces stacked front to back. Kindling on top, favoring right side (see stacking pattern)
No CO spike at the beginning. Very steady oxygen value.
Data for calculation stopped at 71 minutes, when air control was closed.
Flue damper left open. Cold air bypass closed.

Animation HK-K
Animation, 2 minute intervals.

gas analysis
Flue gas
Nice O2 curve. Small delayed CO spike at the beginning.
Note that yellow CO curve is higher than yesterday (HK-K18). However grams per kilogram of CO is lower,
because there is less dilution air (todays blue oxygen curve is lower).
Note also that the low oxyen raises efficiency, despite higher stack temperatures.
Therefore: You can't compare efficiency from one burn to another, or one heater to another, by stack temperature alone.

TESTO Excel data file

Note that the 3 opacity peaks correspond to 3 CO peaks. However, the scales are vastly different. Also, there is
a CO peak at the end (charcoal) with no corresponding opacity peak.

Condar Spreadsheet Results
Condar Spreadsheet Results

Condar Spreadsheet (includes detailed fueling data)

Fuel stack. Front to back, largest pieces on bottom, kindling on top.

fuel pile
Fuel pieces, numbered 1 - 11 from left to right, heaviest to lightest piece.


This page was updated on January 18, 2010
This page was created on February 8, 2009