What is Tom's best? Will he produce a table in J/kg (or SI multiples)for various woods? We too use a wood stove, in our Family Room. Gene.
---- Original message ---- >Date: Mon, 25 Jan 2010 09:08:55 -0600 >From: "James R. Frysinger" <j...@metricmethods.com> >Subject: [USMA:46463] Wood and Combustion Heat Values >To: "U.S. Metric Association" <usma@colostate.edu> > > >I've experienced a small, potential success. > >I searched for data yesterday on various kinds of wood to see which >would put out the most heat in the woodburning stove in the basement of >our new house. I came across a number of pages published by government >and by private concerns. In one case >http://www.engineeringtoolbox.com/wood-combustion-heat-d_372.html >I emailed the following comment, encouraging them to provide information >in metric units, and I've just received this reply in the affirmative. > >I suspect that once the data is provided indicating the specific heat >value of wood (in kJ/kg) it will be seen that there is not much >variation between, say, oak and pine. Most of the variation seen in >existing tables (usually given as Btu/cord) is due to the variation in >the density of the various types of wood. Moisture of course plays a >large part in this, too, so variations in the heat value for one type of >wood at various "moisture content" levels reflect the mass of the >contained water. > >As you can see, I also commented on the inanity of using a cord as a >unit of measurement, especially for tables that boldly provide >four-digit precision in their published values. > >The Forestry Service (USDA) is hopelessly non-metric, I fear. I saw no >way to comment on their table. My comment probably would have fallen on >deaf ears anyway. But this private concern was responsive. > >Jim > >-------- Original Message -------- >Subject: Re: >http://www.engineeringtoolbox.com/wood-combustion-heat-d_372.html : Wood >and Combustion Heat Values >Date: Mon, 25 Jan 2010 05:31:17 -0800 (PST) >From: Tom ..... >To: James R. Frysinger <j...@metricmethods.com> > > > >Thanks for your feedback, >we will do our best! > >Regards, >Tom > >--- On *Sun, 1/24/10, James R. Frysinger /<j...@metricmethods.com>/* wrote: > > > From: James R. Frysinger <j...@metricmethods.com> > Subject: > http://www.engineeringtoolbox.com/wood-combustion-heat-d_372.html : > Wood and Combustion Heat Values > To: ..... > Date: Sunday, January 24, 2010, 5:32 PM > > While I appreciate the inclusion of conversion factors at the bottom > of the table, I feel it would be much more convenient if you > provided a metric table. This would be in terms of kilograms, cubic > meters, and kilojoules. Otherwise your metric readers have to do all > those conversions on their own. > > Further, since the volume of a stack of firewood varies considerably > based on whether or not it is split and how it is stacked, it might > make sense to include a column showing on the heat value of a > kilogram or a thousand kilograms (metric ton, or tonne). In either > case, moisture content also plays a role and you don't state a > value. Thus, your four-digit values overly express a precision that > is not to be had. > > James R. Frysinger > Chair, IEEE SCC 14 > > -- James R. Frysinger > 632 Stony Point Mountain Road > Doyle, TN 38559-3030 > > (C) 931.212.0267 > (H) 931.657.3107 > (F) 931.657.3108 > > > >-- >James R. Frysinger >632 Stony Point Mountain Road >Doyle, TN 38559-3030 > >(C) 931.212.0267 >(H) 931.657.3107 >(F) 931.657.3108 >
