BTU from Exhaust stack
BTU from Exhaust stack
(OP)
I need to measure the amount of BTU's taken out of an exhaust stack by a piece of heat reclaim equipment. I need to do it on the exhaust side; the reclaim side has no way of accessing the exchange media.
I have provisions for peto tube type flow meter and temp in and out. Can some make any recommendations on some thing else.
I have provisions for peto tube type flow meter and temp in and out. Can some make any recommendations on some thing else.





RE: BTU from Exhaust stack
You also need the flue gas composition to determine the heat transfer.
RE: BTU from Exhaust stack
There is a graph of enthalpy vs temperature (Rosin-Fehling) for all hydrocarbon fuels with curves for different excess air %. Below 500 Celsius the % excess air, has little influence. Thus, by measuring the temperature, the enthalpy of the flue gases is directly determined.
RE: BTU from Exhaust stack
Tim
RE: BTU from Exhaust stack
From reading the above-mentioned R-F graph with my old eyes, the following values of kcal per cubic meter of flue gases at normal conditions (0 Celsius and 1 atm) the combustion carried out with 10-30% xs air, would be
Celsius Kcal/normal m3
500 ~180
1000 ~370
Use linear interpolations for intermediate temperatures.