[Stoves] Re\E H2O produce burning ethanol

[Crispin Pemberton-Pigott]

Dear Philip

Thanks for that...but I want to see a number.

Is the water vapour condensed into droplets? Why does condensed steam have a
specific heat different from water? Just interested.

>So what is missing if you use the LHV and the water
>vapour escapes at 100 (or 150 deg C) is the heat needed to raise the water
>vapour from 20 deg C to 100 (or 150).

That was my point.  The regular way to calculate the LHV is not realistic
for stoves.

>At 20 deg C water vapour has a heat content of 2538.2kJ/kg; at 100 deg C it
>has 2676.1 kJ/kg.  So you lose out on 137.9kJ/kg or 0.14kJ/g water

This is quite a bit more than Baldwin was deducting for the hot gases and I
still don't see what the H2O was left out.  You are saying because it is a
small amount.  Per kilo it doesn't look so small to me - 138,000 watts.

Can you work an example?

Thanks
Crispin