An Equation for the Ideal-Gas Heat Capacity of Molecular Oxygen for Temperatures from 30 K to 3000 K

1982 ◽  
Vol 86 (6) ◽  
pp. 538-540 ◽  
Author(s):  
Wolfgang Wagner ◽  
Johannes Ewers ◽  
Robert Schmidt
Keyword(s):  
Heat Capacity ◽  
Molecular Oxygen ◽  
Ideal Gas ◽  
The Ideal

Extremes in Dependences of Enthalpy and Entropy of Saturated Vapour on Temperature

1997 ◽  
Vol 62 (5) ◽  
pp. 679-695
Author(s):  
Josef P. Novák ◽  
Anatol Malijevský ◽  
Jaroslav Dědek ◽  
Jiří Oldřich
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Ideal Gas ◽  
Corresponding States ◽  
Saturated Vapour ◽  
Enthalpy And Entropy ◽  
The Ideal

It was proved that the enthalpy of saturated vapour as a function of temperature has a maximum for all substances. The dependence of the entropy of saturated vapour on temperature can be monotonous, has a minimum and a maximum, or has only a maximum. The thermodynamic relations were derived for the existence of the extremes which enable their computation from the knowledge of dependence of the ideal-gas heat capacity on temperature and an equation of state. A method based on the theorem of corresponding states was proposed for estimating the extremes, and its results were compared with literature data. The agreement between the literature and estimated temperatures corresponding to the extremes is very good. The procedure proposed can serve for giving precision to the H-p and T-S diagrams commonly used in applied thermodynamics.

AN APPLICATION OF NONEXTENSIVE PARAMETER: THE NONEXTENSIVE GAS AND REAL GAS

2007 ◽  
Vol 21 (06) ◽  
pp. 947-953 ◽  
Author(s):  
YAHUI ZHENG ◽  
JIULIN DU
Keyword(s):  
Heat Capacity ◽  
Second Virial Coefficient ◽  
Ideal Gas ◽  
Quasi Equilibrium ◽  
Equilibrium System ◽  
Real Gas ◽  
Nonextensive Statistics ◽  
Thomson Coefficient ◽  
Ideal Gas Model ◽  
The Ideal

By application of the nonextensive statistics to the ideal gas model, we establish a nonextensive gas model. If we regard the nonextensive gas as a real gas, we can use the nonextensive parameter q ∈ ℝ in Tsallis statistics to describe Joule coefficient, Joule–Thomson coefficient, second virial coefficient and etc. We also derive an expression, with a multiplier T1-q, of the heat capacity of the nonextensive gas. We can prove that in the quasi-equilibrium system there is 1 - q > 0, 2 so the heat capacity still vanishes if temperature tends to zero, just as that in Boltzmann-Gibbs statistics.

Acoustic determination of the ideal-gas heat capacity of n-heptane at high temperatures

1990 ◽  
Vol 22 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Sam O Colgate ◽  
Alwarappa Sivaraman ◽  
Kyle Reed
Keyword(s):  
Heat Capacity ◽  
High Temperatures ◽  
Ideal Gas ◽  
The Ideal

Self-consistent equations for calculating the ideal-gas heat capacity, enthalpy and entropy. II. Additional results

1983 ◽  
Vol 11 (3) ◽  
pp. 225-232 ◽  
Author(s):  
Anis Fakeeha ◽  
Ajit Kache ◽  
Zia Ur Rehman ◽  
Yamina Shoup ◽  
Lloyd L. Lee
Keyword(s):  
Heat Capacity ◽  
Ideal Gas ◽  
Self Consistent ◽  
Enthalpy And Entropy ◽  
The Ideal

scholarly journals Approximating the Temperature–Entropy Saturation Curve of ORC Working Fluids From the Ideal Gas Isobaric Heat Capacity

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3266 ◽  
Author(s):  
Juan A. White ◽  
Santiago Velasco
Keyword(s):  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Approximation Scheme ◽  
Approximate Expression ◽  
Ideal Gas ◽  
Saturation Curve ◽  
Working Fluids ◽  
Organic Rankine Cycles ◽  
Previous Approximation ◽  
The Ideal

Recently, we proposed an approximate expression for the liquid–vapor saturation curves of pure fluids in a temperature–entropy diagram that requires the use of parameters related to the molar heat capacity along the vapor branch of the saturation curve. In the present work, we establish a connection between these parameters and the ideal-gas isobaric molar heat capacity. The resulting new approximation yields good results for most working fluids in Organic Rankine Cycles, improving the previous approximation for very dry fluids. The ideal-gas isobaric molar heat capacity can be obtained from most Thermophysical Properties databases for a very large number of substances for which the present approximation scheme can be applied.

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