A MODIFIED SOAVE - REDLICH - KWONG EQUATION OF STATE

FOR PREDICTION OF JOULE-THOMSON INVERSION CURVE

 

K. Fnena*, A. Bellagi

Energy engineering department,

U. R. Thermal and thermodynamics of Industry Process,

E. N. I. M., Av. Ibn Jazzar, 5060 Monastir -Tunisia

* Corresponding author. E-mail: Chimiphy@yahoo.fr

Received: 25 November 2008; revised version accepted:28 February 2009

 

Abstract

     Experimental Inversion data of 13 fluids (air, nitrogen, oxygen, argon, xenon, neon, krypton, methane, propene, water, ammonia, carbon monoxide and carbon dioxide) are used for determination of four adjustable parameters of Soave – Redlich – Kwong new modified equation of state. A non linear optimization procedure is used. The covolume in the proposed equation of state is given by a simple function of reduced temperature. We note here that developed equation gives a so precise description of inversion curve for all studied fluids in all range of inversion temperature. In particular at high reduced temperatures (Tr ³ 2.5) the equation estimates well the maximal inversion temperature, Tr,LIM.

 

Keywords: Joule – Thomson  effect; Equation  of  state;  Covolume; Inversion  curve; Nonlinear  optimization; Inversion  maximum temperature.

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