[Stoves] Efficiency of clean fuel

[Paul S. Anderson]

Quoting Philip Lloyd <plloyd at mweb.co.za>:   snipped

> What we have measured is an 80+/-1% efficiency of transferring electrical
> energy received by the hob into thermal energy in the pot.  For a 
> power station at 37% thermal efficiency, and losing 8% of the
> electrical energy in transmission and distribution, that works out as 27.2%
> overall efficiency from heat energy supplied at the power station to heat
> energy into the pot, which is better than most.

Dear All,

I have an Indian LPG stove that says that the large burner will yield is 2024
kcal per hour (that is about 8400 kilojoules, or 8.4 megajoules, right 
Tom R.?)
  And with about 15-16 megajoules per kg of wood (and much other dry biomass),
that means about a half kg of wood (if fully burned) gives as much heat as the
LPG on that size of burner operating for one hour.

Now, my question is:  with LPG, what percentage of the heat gets into 
the pot on
a reasonable-quality LPG stove?

I want to know that percentage because:  with a good forced-air TLUD gasifier
with a good stove body for keeping the pot close to the fire and 
protected from
wind, etc, I suspect (only my guess, not yet measured) that the heat to 
the pot
will be almost as high as from the LPG.

And how does that compare with the electicity data (above) for a hob (imersion
heating element), versus an electric stovetop heating element, and with other
stoves and the 3-stone fire?

Paul



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