Characteristics and applications of the cold heat exergy of LNG
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摘要:A mathematical model for predicting the low temperature exergy, pressure exergy and total cold heatexergy of Lique®ed Natural Gas (LNG) is developed in this paper. In the model, the liquid mixturedensities are calculated by a shape factor Corr..

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A mathematical model for predicting the low temperature exergy, pressure exergy and total cold heat
exergy of Lique®ed Natural Gas (LNG) is developed in this paper. In the model, the liquid mixture
densities are calculated by a shape factor Corresponding State method, Vapor-Liquid-Equilibrium data
of LNG are predicted by an improved method and the in uences of real uid acts are considered. The
model is used to determine the various exergies, and the in-uences of ambient temperature, system
pressure and mixture component concentrations on the cold heat exergies are analyzed. Different
schemes for applying the low temperature exergy and pressure exergy are proposed. Based on the
modeling results, it is proposed that the schemes for applying the cold heat exergies of LNG be
determined by thermodynamic cycle optimization, while considering the magnitudes of low temperature
exergy and pressure exergy, as well as the required gas supply pressures.

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