Abstract
The fundamental bases for the calculation of the thermodynamic properties of substances are the thermal equation of state and the dependence of some of the basic specific heat capacities on temperature. Any other thermodynamic properties of a substance can already be deduced from these relations. The aim of this paper is to design the simple thermal equation of state for water steam based on original BWR thermal equation of state, which describes the behavior of H2 O in the gaseous phase in region of usual pressures and temperatures with sufficient accuracy.
Highlights
Water and water vapor plays an important role in many phenomena occurring in nature
The aim of this paper is to design the simple thermal equation of state for water steam based on original BWR thermal equation of state, which describes the behavior of H2O in the gaseous phase in region of usual pressures and temperatures with sufficient accuracy
If the thermodynamic properties of water vapor was calculated from the ideal gas state equation adjusted to the real behavior of water steam through the 2nd, 4th and 6th member in BWR equation, the area, where the error of calculated values was less than 1%, significantly increased: for temperature 1000oC to the pressure 50 MPa, for temperature 500oC to the pressure 22 MPa
Summary
Water and water vapor plays an important role in many phenomena occurring in nature. They are the customary working substances in various industrial fields (for example in engineering industry, chemistry field, food industry, ...). As well as other multi-parameter equations, BWR equation can be only used to description of properties of substances for which there is sufficient amount of experimental data in wide range of pressures and temperatures. This requirement is fulfilled for water and water steam undoubtedly. The aim of this paper is to provide the values of constants of BWR equation A0, B0, C0, a, b, c, α and γ so that this BWR equation describes with a "sufficient" accuracy the behavior of water seam, it means H2O in gas phase in commonly used ranges of pressures and temperatures, and if possible tills to limit curve. In triple point (temperature 0.01oC, pressure 0.000611657MPa), the state of saturated steam is calculated with accuracy 0.07 % using the model of ideal gas
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