Hope you guys don't mind me making a new thread. Things have come a longways since I first started on the BTU ratings / tables and I could not modify my original post. Did this ever turn out to be a journey, enough of a journey that I have written a blog post on it: How I built my Firewood BTU Ratings In a nutshell, once I found that most firewood btu ratings were not applicable to Firewood I went digging, the more I learned, the more I dug. Vicious circle really. The fact that I could find very little real research on ash and coals did not help, that also took me on a mining expidition. So the new Firewood BTU ratings have their own page now as they far outgrew the blog post, they live here: Firewood BTU Ratings (Beta) – Bois à Feu du Nord If you have any questions regarding how I put it all together most of it should be in the blog post, at the bottom there is an expandable section that goes through how i setup the ratings. Put on your nerd hat before you open that section! Or you can always ask me, and of course if you see anything wrong or to be adjusted please do let me know.
Is there any way to make the chart with an option to view it by btu rating? Also would be nice to click on 3-4 different types of wood and compare them. It might be too much hassle, idk. Awesome job on the chart either way.
Osage Orange should be at the top of the charts for btu ratings. It only changes the order of that page. Not the highest btu's of all types of trees.
How about if you do "Show 100 entries" and than click btu column. It should all 100 highest btu to lowest.
Yes that worked. I've never heard of anything burning hotter than hedge. Hedge burns so hot it will warp a mild steel stove, and crack a cast iron stove. But some btu charts rate eucalyptus and yew as higher. I wonder if anyone has burned them and what the results were? Edit: This website has tamarack at 21.8 million btu cord.
Please recheck your numbers. For example, the GREEN density of pinyon pine is listed as 51 lb/ft3 by Colorado State University. Your DRY density is 102 lb/ft3 ?????? My favorite density table dates back to 1931, USFS/U of Wisconsin. I do not think wood has changed in the last 100 years. The 1931 table also lists the pinyon pine green density as 51 lb/ft3. The highest GREEN density in the 1931 USFS/UofW table is 88 lb/ft3, ironwood, the next highest is 77. Your highest DRY weight is over 100 lb/ft3 ???? Also, properties like splitting, coaling, ash production... vary widely for a wood type depending on growing conditions, wood moisture level when burned, wood burning appliance design/operation... and so is difficult to achieve accurately(actually impossible). For me, I approach each tree/log as a new adventure... Also, I would list your assumed cubic feet of wood in a cord as a footnote. Typically 80 for split but I use 100 for a cord of nested rounds.
I screwed up some math on the last update I did last night, rusjing and tired because I wanted to get it done before sleep I 100% agree about ash and coal, like you said it varies widely, I will probably add some type of note stating that. If I remeber right the cord calculations were based on 85, I will add it as you suggested. Thank you for the feedback and suggestions
I never noticed the BTU error but gave up on BTU's because of the scatter and noise in the numbers, gross versus net for example. I only use weight, both green and at 12% moisture, and add my own cord void space adjustment (split 80-85 ft3/cord, nested rounds 100, mixed nested rounds can reach 110). I did the math for square stacking of rounds (easy) and wiki has the calculations for nested rounds and mixed nested rounds (tough). Look for circles in a box, not spheres in a cube.
