Stack gas temperature
Stack gas temperature
(OP)
Hello everyone,
I am working on a project that would involve routing the exhaust of a number of combustion devices to an existing stack. In order to do some basic modeling, we need to know the stack gas temperature. We have the exhaust temperature from the devices and the existing stack height. Does anyone know of a method to estimate the stack gas temperature based on this information?
Many thanks,
Roma
I am working on a project that would involve routing the exhaust of a number of combustion devices to an existing stack. In order to do some basic modeling, we need to know the stack gas temperature. We have the exhaust temperature from the devices and the existing stack height. Does anyone know of a method to estimate the stack gas temperature based on this information?
Many thanks,
Roma





RE: Stack gas temperature
RE: Stack gas temperature
RE: Stack gas temperature
Average T = [T1(M1) + T2(M2) + T3 (M3) + ....] / [M1 + M2 + M3 + ....]
T is temperature and M is mass.
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: Stack gas temperature
Roma
RE: Stack gas temperature
RE: Stack gas temperature
What is a reasonable estimate of heat loss for a calm summer night is entirely different than a reasonable heat loss for a cold wintry day when it is raining and there is a high wind. Unless you were to obtain the real world data (as suggested by bimr) for every hour of every day for a few years, it is eventually a judgement decision that will have to be made. I don't think of that as "fudging" numbers ... I think of that as facing up to reality.
I assume that you want that stack exit temperature to calculate the plume rise needed for your pollution dispersion modeling. Even with the best of data, the final dispersion calculations may vary from reality by a factor of about 2 if you believe the the U.S. EPA ... and I don't. I think the final dispersion calculations may vary from reality by a factor of as much as 10 or more.
Read the book "Fundamentals of Stack Gas Dispersion" (ISBN 0-9644588-0-2) which you might find in a good university library.
Milton Beychok
(Visit me at www.air-dispersion.com)
.
RE: Stack gas temperature
Although the commonly used buoyancy characteristic for plume rise is temperature, the total heat flux is just as good a parameter. See my paper ".. model for Flare flames and Plumes" at www.geocities.com/flareman_xs for formulae which avoid temperature calculations.
David