Thermodynamic Properties of Import to Environmental Processes and Remediation. I. Previous Thermodynamic Property Values for Cadmium and Some of Its Compounds

1998 ◽  
Vol 27 (5) ◽  
pp. 915-946 ◽  
Author(s):  
Donald G. Archer
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Property Values ◽  
Environmental Processes

scholarly journals First-principles and CALPHAD-type study of the Ir-Mo and Ir-W systems

2020 ◽  
Vol 56 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Y.-Y. Huang ◽  
B. Wu ◽  
F. Li ◽  
L.-L. Chen ◽  
Z.-X. Deng ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Phase Equilibria ◽  
First Principles ◽  
Critical Evaluation ◽  
Intermetallic Phases ◽  
First Principles Calculations ◽  
Property Data ◽  
Self Consistent

This study presents the thermodynamic modeling of the Ir-Mo and Ir-W systems by means of the CALPHAD (CALculation of PHAse Diagrams) approach supported with the first-principles calculations. A critical evaluation of the phase equilibria and the thermodynamic property data in literature was conducted for both systems. Due to the lack of experimental data, the first-principles calculations were applied to obtain the enthalpies of the solid and intermetallic phases. The thermodynamic parameters were assessed using the PARROT module of Thermo-Calc. A set of self-consistent parameters for the Ir-Mo and Ir-W systems was obtained after the optimization. Satisfactory agreement between the calculated results and the experimental data, including phase equilibria and thermodynamic properties was achieved.

Thermodynamic Property Models for the Simulation of Advanced Wet Cycles

2003 ◽  
Author(s):  
J. Yan ◽  
X. Ji ◽  
M. Jonsson
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Performance Test ◽  
Elevated Pressure ◽  
Working Fluid ◽  
Water Mixture ◽  
Water Addition ◽  
Cycle Systems

Advanced gas turbine cycles with water or steam addition (i.e., wet cycles) have attracted much interest in recent years and some commercial systems are available. Because water is added into different points of a gas turbine depending on the methods of water addition, the working fluid of gas turbine has been changed to air-water (humid air) mixture at elevated pressure. Thus, the thermodynamic properties of working fluid are different as conventional gas turbines. Accurate calculation models for thermodynamic properties of air-water mixture are of importance for process simulation, and traceable performance test of turbomachinery and heat exchangers in the wet cycle systems. However, the impacts of thermodynamic properties on the simulation of systems and their components have been overlooked. This paper is to present our study and provide a comprehensive comparison of exiting thermodynamic models of air-water mixtures. Different models including ours have been used to calculate some components including compressor, humidification tower, heat exchanger etc. in wet cycles for investigating the impacts of thermodynamic properties on the system performance. It reveals that a careful selection of thermodynamic property model is crucial for the design of cycles. This paper will provide a useful tool for predicting the performance of the system and design of the wet cycle components and systems.

Formulations for the Thermodynamic Properties of Pure Substances

2003 ◽  
Author(s):  
George A. Adebiyi
Keyword(s):  
Thermodynamic Properties ◽  
Specific Heat ◽  
Constant Pressure ◽  
Equations Of State ◽  
Property Values ◽  
Complete Analysis ◽  
Specific Heat Data ◽  
Pvt Data ◽  
Pure Substances ◽  
Heat Data

Complete analysis of thermodynamic systems generally requires knowledge of the property values of substances at different states. Performing such analysis on the computer is facilitated if the equations of state for the substances are available in relatively simple analytic forms. This article presents a procedure for formulation for the thermodynamic properties of pure substances using two primary sets of data, namely the pvT data and the specific heat data such as the constant-pressure specific heat, cp, as a function of pressure and temperature. By developing a correlation of the pvT data in the virial form of equation of state, an appropriate corresponding correlation can be determined for the specific heat of the substance on the basis of the laws of thermodynamics. The resulting equations of state take on remarkably simple analytic forms that give accurate predictions over the range of input data employed.

The Impact of Thermodynamic Properties of Air-Water Vapor Mixtures on Design of Evaporative Gas Turbine Cycles

2001 ◽  
Author(s):  
Farnosh Dalili ◽  
Martin Andrén ◽  
Jinyue Yan ◽  
Mats Westermark
Keyword(s):  
Water Vapor ◽  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Gas Turbine ◽  
Gas Mixture ◽  
Real Gas ◽  
The Real ◽  
Property Data ◽  
Vapor Mixtures ◽  
The Impact

Reliable thermodynamic property data for air-water vapor mixtures are lacking for the design of evaporative gas turbine cycles (EvGT). Due to high working pressures and temperatures of gas turbines, considerable error would occur when applying the ideal models instead of the real gas mixture models. This paper presents an extensive literature study regarding models for computing thermodynamic property data of gas mixtures. The Hyland and Wexler model is found to be the best available despite the limited temperature range. However, experimental data are needed to verify the extrapolation. Furthermore, this paper evaluates the impact of thermodynamic properties of air-water vapor mixtures on the design of EvGT cycles. A suggested EvGT configuration, with results based on ideal gas mixture model and steam tables, is selected as a reference. The real properties of the working fluid mixture are recalculated by the means of the Hyland and Wexler model and applied in the cycle calculation. The results based on real data are compared to those based on ideal. The results show that the real gas model predicts higher saturation humidity at a given temperature. The higher volatility of water improves the humidification performance. In the case studied here, the flue gas temperature is lowered by about 3°C and the cycle efficiency is improved only marginally. The real gas model predicts higher heat duty for superheating of moist air by about 10 percent, or 2 MW. Finally, it can be concluded that thermodynamic property data mainly affect component sizing, especially the humid air superheater and to some extent the boiler.

An adaptive distance-based group contribution method for thermodynamic property prediction

2016 ◽  
Vol 18 (34) ◽  
pp. 23822-23830 ◽  
Author(s):  
Tanjin He ◽  
Shuang Li ◽  
Yawei Chi ◽  
Hong-Bo Zhang ◽  
Zhi Wang ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
Group Contribution ◽  
Intramolecular Interactions ◽  
Group Contribution Method ◽  
Property Prediction

A new distance-based group contribution method that describes intramolecular interactions systematically is developed to calculate thermodynamic properties accurately and efficiently.

A General Expression of Combustion Enthalpy Difference at Constant Temperature of CnHmOl-Air System

1985 ◽  
Author(s):  
Xun-Quan Fu ◽  
Zuo-Min Fan
Keyword(s):  
Thermodynamic Properties ◽  
Thermodynamic Property ◽  
General Expression ◽  
Constant Temperature ◽  
Combustion Gases ◽  
Combustion Enthalpy ◽  
Air System ◽  
Enthalpy Difference ◽  
Combustion Processes

Combustion enthalpy difference at constant temperature is a new kind of thermodynamic property of combustion gases. Its general expressions and its applications to making generalized tables of thermodynamic properties of combustion gases and to calculating complex combustion processes thermodynamically for CnHmOl-air system are given in the paper.

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