by george i think i have it..
The flame temperature can also be predicted from the First Law of Thermodynamics given by
En[h°+Dh] = En[h°+Dh] +Q
r i f i p i f i l
where ni is moles of species i per mole of fuel,
hf°; the enthalpy of formation at standard temperature,
h = h(T) - h(T°

= C p(T - T°

,
T° is standard temperature,
R and P are reactant and product.
Ql represents the heat loss per mole of fuel consumed.
In this experiment the flame is established on a flat flame burner as shown in Figure 2. The burner is water cooled and the heat loss from the flame to the burner can be measured by measuring the difference in enthalpy between the inlet and outlet cooling water.
q = mCw(To - Ti)
where q is the heat loss per unit time, m is the mass flow rate, Cw the specific heat of the cooling fluid (water) and T o and Ti are the outlet and inlet temperatures, respectively.