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