Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The organic Rankine cycle (ORC) is one solution to recover energy from high temperature hot sources.It requires working fluid with high critical coordinate values. It is named for its use for an organichigh molecular masse fluid with a liquid vapor phase change. The knowledge of phase diagram ofworking fluid is a crucial task in refrigeration process. In this context, a new mixture of decafluo-robutane (R3110) and 1,1,1,3,3-pentafluorobutane (R365mfc), is studied by means of experimentalmeasurements and modeling procedures. The purpose is to obtain the isothermal vapor liquid equi-librium data (R3110 + R365mfc) of binary system ranging from (333.26 to 441.61) K temperature, and(0.2016 to 3.0927) MPa pressure. The data were obtained with accurate within u(T, k = 2) = 0.02 K, u(P,k = 2) = 0.0003 MPa and u(z) = 0.004 for molar composition. In the present work, the static analytic methodis another time investigated to achieve a high quality data as it was largely demonstrated previouslyby the team of our laboratories. The experimental data are correlated using the classical equations:Peng Robinson equation of state, the Mathias Copeman alpha function, and the Wong Sandler mixingrules involving the NRTL model. The predicted critical line is well reproduced.