[Stoves] Grass Fireballs burn cleaner than wood

[Crispin Pemberton-Pigott]

Dear Richard

Thanks for putting numbers onto it.

I can offer the following for a comparison.

New Dawn Engineering manual 16 per time briquetting operation producing 1500
briquettes (Fire Cubes) per hour of 60 gm each 8 productive hours a day =
720 kg dry mass.

Labour = 18 people involved in all operations from unpacking to shipping as
you comprehensively listed.

Result: 40 kg of briquettes per person, just about the same as your figure,
though a different product.

So I get 15 watts per kg.  Given the variables I would say they are equally
productive.

This has to be the most energy efficient possible process.  I would hold
that if you disregard the energy in the biomass itself (i.e. what will be
lost) that AD's charcoal dust operation packs a lot of energy in the
charcoal per unit human labour input.

Regards
Crispin