Need Help energy calculations.
Need Help energy calculations.
(OP)
NEED: FREE Energy (GIBBS)? or Specific Energy for
gasoline in kcal/mole or energy/unit.
Can you bright minds help me out please. Years ago
in College we did a combustion calculation appx. like
the following. The latent heat (heat contained at start of process) of reactants were combined with the specific heat of reaction to products. This total heat of reaction plus
the starting heat was devided among the mass of the products
to determine the theoretical combustion temperature of the products. I may have gotten the terms and the method slightly wrong, so please do straighten me out. I realize that this whole calculation is complicated by a cycle of compression and decompression. So, what's the situation?
Sideliner (met.) PLease,Please.
gasoline in kcal/mole or energy/unit.
Can you bright minds help me out please. Years ago
in College we did a combustion calculation appx. like
the following. The latent heat (heat contained at start of process) of reactants were combined with the specific heat of reaction to products. This total heat of reaction plus
the starting heat was devided among the mass of the products
to determine the theoretical combustion temperature of the products. I may have gotten the terms and the method slightly wrong, so please do straighten me out. I realize that this whole calculation is complicated by a cycle of compression and decompression. So, what's the situation?
Sideliner (met.) PLease,Please.





RE: Need Help energy calculations.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Need Help energy calculations.
John B. Heywood's book on IC engines gives some convenient tables and polynomial fits for enthalpies, heating values, etc.
I normally use EQUIL (which is part of CHEMKIN) to calculate flame temperatures for natural gas type fuels.
RE: Need Help energy calculations.
Yes, I do want to calc. flame temp. for some situation.
Ohhhhhhhh, I am like sooo way past the times. I'm screwing around with the system so that regular adiabatic tables just won't do. And, it isn't an isothermal calculation either. As a cetified fossil for all to see, may I please ask what is EQUIL and CHEMKIN? Software? Thanks! Sideliner
RE: Need Help energy calculations.
RE: Need Help energy calculations.
C.R. Ferguson wrote book with some fortran routines for calculating equilibrium temperature. See Ferguson, C. R., 1986, "Internal Combustion Engines", Wiley. Do a search for the terms "farg", "ECP", and Ferguson and you will some info on them. They make it easy to calculate an adiabatic flame temperature, if you have a FORTRAN compiler.
RE: Need Help energy calculations.
You guys are great!Thanks to you and Eng-Tips!
I'll do some "figurin," scratch both ends, and
let you finally know what I am up to doing. Give
me at least a month.
Sideliner