| Summary: | Hydrogen is one of the most promising energy sources of the future enabling
direct production of power and heat in fuel cells, hydrogen engines or
furnaces with hydrogen burners. One of the last remainder problems in
hydrogen technology is how to produce a sufficient amount of cheap hydrogen.
One of the best options is large scale thermochemical production of hydrogen
in combination with nuclear power plant. copper-chlorine (CuCl) cycle is the
most promissible thermochemical cycle to produce cheap hydrogen.This paper
focuses on a CuCl cycle, and the describes the models how to calculate
thermodynamic properties. Unfortunately, for many components in CuCl cycle
the thermochemical functions of state have never been measured. This is the
reason that we have tried to calculate some very important thermophysical
properties. This paper discusses the mathematical model for computing the
thermodynamic properties for pure substances and their mixtures such as CuCl,
HCl, Cu2OCl2 important in CuCl hydrogen production in their fluid and solid
phase with an aid of statistical thermodynamics. For the solid phase, we have
developed the mathematical model for the calculation of thermodynamic
properties for polyatomic crystals. In this way, we have used Debye functions
and Einstein function for acoustical modes and optical modes of vibrations to
take into account vibration of atoms. The influence of intermolecular energy
we have solved on the basis of Murnaghan equation of state and statistical
thermodynamics.
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