Basis of these
facts:
1. Wood contains approx. 8500 BTU per pound
2. Wood (seasoned) is approximately 20% Moisture:
Wood Pellets are approximately
8% Moisture.
There is a little difference between the heat
value of wood at these two moisture levels.
Therefore:
2000 Lbs of Pellets at 8500 BTU per pound is 17,000,000 BTUs.
Multiply this figure by 80% (the efficiency of the pellet
stove) to get 13,600,000 BTU per ton delivered to the home.
One cord of White Oak (oven dry) contains 29,000,000 BTUs.
This is because the weight (oven dry) of this cord is
3500 lbs and
the BTU content is the same as pellet (8500 BTU/lb).
Now, we will figure the BTU to the home for stoves of varying efficiency.
80%
Efficient = 23,200,000 BTU into the home
70%
" = 20,300,000
BTU into the home
60%
" = 17,400,000
BTU into the home
Therefore, even in the worst case, 1 cord of oak
=
1 1/3 ton of pellets.
and best case, 1 cord of
wood =
1 3/4 ton of pellets.