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Current Heater Testing at Lopez Labs

February 13, 1997


(9:30 a.m)

Today, we did run 7 of a 10 run series with a controlled wood load. All pieces in a given run have the same moisture content, and are split from hardwood boles between 8" and 14" in diameter. The wood load consists of 8 pieces and 2 lb kindling. The pieces are stacked in a 2-3-3 log cabin configuration. The two top rows are stacked tight, with the bark down (see fuel load photo).

Today's run went fairly smoothly. We stacked the smaller pieces in the middle row, with larger pieces on top. The top ones were packed tight, and they burned a little slowly. Notice the change when the pile was poked after the 50 minute reading. Today's load was 12 lbs more than yesterday, resulting in a 0.5 Kw higher average output over 24 hours.

RUN No. HK-f27
 
 
Number of Pieces
8
Standard
Deviation
Total Weight, lb
67.1
2.48
Wood Moisture %
19.1
0.64
Fuel Surfac/Vol
2.57

Error:

Average Stack Temp, F
356.9

+/- 0.1

Average O2 %
14.9

+/- 0.2

Stack Dilution Factor
3.46
 
g/kg CO
22.5
estimated
Combustion Efficiency %
97.44
 
Heat Transfer Efficiency %
70.66
 
Overall Efficiency %
68.86

+/- 1.5

Average Output, 24 hrs, Kw

3.9

 

 
 

Click on thumbnails below for larger image. See February 11 for a continuous set of large images.

2 minutes
5 minutes
10 minutes
15 minutes
1" air slot at bottom
of glass was closed after
this photograph
20 minutes 
25 minutes
30 minutes
 
 
40 minutes
50 minutes
Pile was poked after reading
Note increased flaming in next frame,
Spike in stack temperature and dip
in oxygen on graph
55 minutes
60 minutes
70 minutes
80 minutes
90 minutes
100 minutes
110 minutes
120 minutes 

Compare with yesterday

0 minutes
 

This page last updated on April 8, 2003
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