[Stoves] Fuel usage and local growing Re: Discussion of biomass cooking stoves <>

[Paul S. Anderson]

Quoting paal wendelbo <paaw at online.no>:  Relating to Zambia project.

>
> One of the species will be Sespaina Sespan. For 360 plants we need 
> about 200 m2, the first year you will have a small output, but the 
> next year after cutting the yield will increase with several sprouts 
> and continue increasing every year. The Miombo forest used to day for 
> charcoal gives about 3 ton per ha/year. Energy forestry can give 
> 10-20 ton per ha/year depending on the sort planted.  A household of 
> 5 need 2-3 kg chopped wood per day for cooking with a good FES. The 
> rest can be sold.

I did some simple (and rounded off) calculations and I think I made an 
error. Please help.

3 kg per family x 334 days/year = 1000 kg = one tonne.

100 m2 is 10 x 10 m is 1% of a hectare (10,000 m2).  (Because about 
half of the
mentioned 200 m2 was for fuel-to-sell.)

10 ton per ha/yr = 10,000 kg/ha/yr, or 1 kg per m2 (or high side is 2 kg/m2)
That seems low.  Is my error here?

100 m2 yields 100 kg, not 1000 kg.

Seems like an error of x10.  Where did I go wrong?

Paul




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