Overview of the thermo Library
Published: 2023-01-06 17:18:04

The thermo library is a powerful tool for solving a variety of problems in the field of chemical engineering. Some examples of the types of problems that can be solved using the library include:

- Predicting the behavior of gases, liquids, and their mixtures under different conditions of temperature, pressure, and volume.

- Calculating thermodynamic properties such as enthalpy, entropy, pressure, and volume.

- Modeling the phase behavior of mixtures, including the prediction of vapor-liquid equilibrium, solid-liquid equilibrium, and solid-vapor equilibrium.

- Designing and analyzing chemical processes, including predicting the performance of distillation columns, reactors, and other process equipment.

- Performing thermoeconomic analysis to evaluate the economic feasibility of chemical processes.

- Estimating the physical properties of pure substances and mixtures, such as density, viscosity, and surface tension.

## Equation of State Models in the thermo Library

One of the key features of the thermo library is the ability to model the behavior of gases, liquids, and their mixtures using different types of equations of state (EOS). An equation of state is a mathematical model that describes the relationship between the thermodynamic properties of a substance or mixture, such as pressure, volume, and temperature.

The thermo library includes several different EOS models that can be used to predict the behavior of gases, liquids, and mixtures under a wide range of conditions. Some examples of the EOS models implemented in the thermo library include:

1. Peng-Robinson (PR) EOS: a widely-used EOS that is suitable for modeling the behavior of a wide range of gases, liquids, and mixtures.

2. Redlich-Kwong (RK) EOS: an EOS that is particularly well-suited for modeling the behavior of gases and light hydrocarbons.

3. Soave-Redlich-Kwong (SRK) EOS: an EOS that is a modification of the RK EOS and is widely used for modeling the behavior of gases and light hydrocarbons.

## Thermodynamic Properties Calculated by the thermo Library

The thermo library can be used to calculate a wide range of thermodynamic properties of pure substances and mixtures. Some examples of the types of thermodynamic properties that can be calculated using the thermo library include:

- Enthalpy: a measure of the total energy of a system, including both internal energy and the energy associated with the work done by the system.

- Entropy: a measure of the disorder or randomness of a system.

- Pressure: the force per unit area exerted on a system by its surroundings.

- Volume: the amount of space occupied by a system.

- Density: the mass of a substance per unit volume.

- Viscosity: the resistance of a fluid to flow.

- Surface tension: the measure of the cohesive forces within a liquid that cause it to act as a single entity.

The thermo library can also be used to calculate more complex thermodynamic properties, such as the heat of vaporization, the isobaric expansion coefficient, and the fugacity of a substance. These properties can be useful for understanding the behavior of gases, liquids, and mixtures under different conditions of temperature, pressure, and volume.

**Conclusion**
In this tutorial, we learned about the thermo library, a powerful tool for solving a variety of problems in chemical engineering. We saw that the thermo library can be used to model the behavior of gases, liquids, and their mixtures using different types of equations of state, and can calculate a wide range of thermodynamic properties, including enthalpy, entropy, pressure, volume, density, viscosity, and surface tension.

We also learned about the different equation of state models implemented in the thermo library, including the Peng-Robinson (PR) EOS, the Redlich-Kwong (RK) EOS, and the Soave-Redlich-Kwong (SRK) EOS. These models can be used to predict the behavior of gases, liquids, and mixtures under a wide range of conditions.