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-   -   The cost of the fire (http://www.fornobravo.com/forum/f16/cost-fire-5991.html)

jcg31 01-24-2009 04:11 PM

The cost of the fire
 
This may seem a tad OCD-ish but for the past few months I have taken to weighing the wood before putting it into the oven to get a better sense for costs and consistency between fires. I am using a $5 hand scale lifting the wood in a home depot bucket. What I have found is that on average it takes me about 73 pounds of wood to get the oven up to Pizza temps (42" hemispherical dome). 73 pounds of wood equates to approx 373,760 BTUs.

I received a pretty good deal from a local apple orchard on some aged apple paying $126 for a full cord. There are 4100 pounds in a cord of apple so I am paying $2.25 to fire up the oven and probably another $.50 to keep the flame going during the festivities. Not bad, particularly considering that the residual heat lasts all week for various delectable's on the way down.

There are wood species conversion charts all over the internet, the one I used is here:

http://www.daviddarling.info/encyclo...value_BTU.html

It will tell you that each pound of wood (any variety) will generate approx 6400 BTUs. I am guessing that that is 0% moisture and I am at about 20% moisture so I knocked the number down to 5120 BTU/lb .

Cost using other fuels (hypothetically):
Electric: $11.65
Natural Gas: $4.55
Propane: $7.28

Jim

Archena 01-24-2009 04:32 PM

Re: The cost of the fire
 
It's not OCD-ish, it's CDO-ish... :D


Okay, out of curiosity, how are you getting your pricing? Did you actually weigh the entire cord?

jcg31 01-24-2009 04:42 PM

Re: The cost of the fire
 
Quote:

Originally Posted by Archena (Post 49623)
It's not OCD-ish, it's CDO-ish... :D


Okay, out of curiosity, how are you getting your pricing? Did you actually weigh the entire cord?

Yeah with a real big bucket from Home Depot and my trusty hand scale. Actually as mentioned above, there are a bunch o sources out there that will tell you volume and weight by species of wood. the one I used was:

http://www.daviddarling.info/encyclo...value_BTU.html

gjbingham 01-24-2009 09:17 PM

Re: The cost of the fire
 
73 pounds of wood sounds like a bunch to me. Perhaps I will weigh my next load prior to firing. My 37", I would guess, uses about 40 - 50 pounds of mixed wood to get to cooking temps. Interesting observation. I wonder what others are thinking.
G.

Frances 01-25-2009 08:52 AM

Re: The cost of the fire
 
I am thinking... how many cubic meters was that to a cord again? I pay 100 USD per "ster" (which works out as one cubic meter)

Hum... very interesting though.

Wiley 01-25-2009 09:37 AM

Re: The cost of the fire
 
Frances,
This link says 2.55 cubic meters per cord.
Conversion tables Cord to cubic meter

Wiley

Wiley 01-25-2009 09:44 AM

Re: The cost of the fire
 
Frances that link must have a different idea of what a cord is than what I am used to. A cord of wood to me is 4 ft x4 ft x 8 ft for 128 cu ft. A cubic meter contains 35.3146 cu ft. 128 divided by 35.3146 gives 3.624 cu meters per cord. In my minds eye that seems a better answer, as well.
Wiley

carioca 01-25-2009 11:53 PM

Re: The cost of the fire
 
Hi all!

The type of firewood I produce on our land from long-felled trees (mostly) is high-density hardwood such as iron bark, stringy bark or messmate. Such timber costs Sydney folk $A260 per tonne (ca. 2.1 cubic metres), plus delivery.

(I haven't factored in my $A2000 Stihl chainsaw nor the Fiskars block splitter and axe, but...)

Ciao,

LMH

nissanneill 01-26-2009 03:12 AM

Re: The cost of the fire
 
When I could buy very old, dead and thoroughly dry River Red Gum (during the cold months) I would put between 80 and 90Kg into the boot of my little sedan and costing usually around $20-25 (cost is $280/ton).
This will generally give me 4 burns which averages out to $5 per bake. I have around 29 tons of wood currently and will use that rather than buying it which is quite difficult out of season.

Neill

david s 01-26-2009 03:33 AM

Re: The cost of the fire
 
If I.m cooking a roast I'll use about one 10 L bucket of wood. For pizza about double that, but my oven is pretty small. Have never bought wood, just use fallen eucalypt sticks and branches.


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