# Inverted Janaf formula

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 September 27, 2007, 10:01 Inverted Janaf formula #1 gianpaolo Guest   Posts: n/a Hi all, Could Somebody help me? I'm looking for the inverted Janaf Formula to calculate T from enthalphy. Thanks bye

 September 27, 2007, 11:48 Re: Inverted Janaf formula #2 opaque Guest   Posts: n/a Dear gianpaolo, I have never heard of a inverted Janaf Formula? To get T from enthalpy, you must find the solution of the problem "Your value of H" - JANAF @(T) = 0 since JANAF formula is nonlinear (positive and negative powers of T), you will use something like a Newton's root finder, or secant method, or plain bisection. Hopefully, there is only one positive root. Opaque

 October 1, 2007, 05:13 Re: Inverted Janaf formula #3 gianpaolo Guest   Posts: n/a I had thought about this kind of solution, using secant method, and in this way the solver is ok, but I wish I make my solver faster. So I wonder if someone implemented any approximated formulas for the H -T since this formula is monotone. Anyway I thank you very much for the answer. Gianpaolo

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