[Stoves] Gross verses net calorific value for dry wood

[Crispin Pemberton-Pigott]

Dear Lanny

 

It is not really the latent of evaporation that is relevant (though the number is the same). It is the latent heat of condensation that is generally agreed is not realisable as useful energy for cooking purposes.

 

There is a 60 kJ error in it conceptually, however. It does not include as unrealisable the energy released by cooling the condensed water to 20 C. That is why Baldwin and I agree it (the estimated deduction from HHV if the H2 content is not known) should be 1.38 not 1.32 but, who’s listening?

 

It is an bit arbitrary and that is what is used.  

 

Regards

Crispin

 

 

If the reaction takes place in a gaseous state, why does the laden heat of evaporation apply?

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