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2010 Heater Fuel Tests at Shawville

Test HK-L17
February 20, 2010

Second test of a control pair with cordwood. Matched set of fuel loads. Warm heater.
White birch, 53.1 lb total, incl. 3.75 lbs kindling. 28.3% moisture.
North-South loading. Largest pieces first. Loaded onto a coal bed (Colorado method)
Efficiency is calculated at 95% oxygen recovery (Colorado method).
Stack temperature corrected for height.

For this test, the bell attached to the heater was modified. A diverter brick was added
inside. The average stack temperature dropped 13 degrees, and the efficiency increased
by 1.5%.

Top view of bell, through the ceramic glass lid.
Gases exit the heater at the top left. Two 13.5" high bricks have been added as a diverter, with
space at the sides for bypass.
Gases enter the chimney at the lower right.

Condar Spreadsheet Results
Condar Spreadsheet Results

Condar Spreadsheet (includes detailed fueling data)

Animation, 2 minute intervals.

gas analysis
Flue gas

Testo graph
Graph from Testo analyzer. 30 second sampling intervals.
The green line tracks the CO/CO2 ratio.

TESTO Excel data file
Raw data file

First 3 minutes of data missing. The tallest spike is when the main fuel load went in (bottom ignition from the coal bed).
PM measurement started at 8 minutes, and does not include the kindling burn.

fuel load
Fuel load.
Stacking is North-South, with largest pieces on bottom, onto a coal bed.
fuel load
Fuel load. Pieces are ordered smallest to largest, left to right. Stacking was from right to left (largest pieces on the bottom).

burn sequence
Burn sequence.

This page was updated on March 7, 2010
This page was created on February 20, 2010