Development of Virial-Equation of State for Gas Phase of R-1234yf, R-1234ze(E), and R-1233zd(E)

• Main Author: Sirajuddin, Hanif
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43163
• Institution: Institut Teknologi Bandung

Air conditioning is closely related to the automotive, building, and industry sectors because it involves aspects of comfort, activities and processes. The development of refrigerant as an air conditioning medium always coincides with environmental issues regarding ozone depletion and health. The use of environmentally friendly hydrofluoroolefin refrigerants is a solution because it has a zero Ozone Depletion Potential value and a very small Global Warming Potential. The limitations of experimental data, especially in the gas phase, encourage the development of virial-equation of state to predict the required thermodynamic properties. Development of virial-equation of state for R-1234yf, R-1234ze (E), and R-1233zd (E) based on potential energy that describes the intermolecular interactions of gas particles. The development of the equation is carried out through a process of optimization of experimental data with a combination of genetic algorithms and least squares regression to get virial-equation of state. The development of virial-equation of state for gas requires ideal gas isobaric heat capacity to include the caloric properties in the thermodynamic properties. The equation is developed by considering the potential theory of Lennard-Jones and square well. The Lennard-Jones potential based equation has better reliability than square wells. Statistical results show that the deviation of experimental data is low and the extrapolation results are reliable because the Lennard-Jones equation has more nonlinear variables. Extrapolation of virial-equation has the same trend as the equation in the gas phase in general. The compressibility factor represents the ideality of the refrigerant. The temperature, pressure, and structure of the refrigerant determine the level of ideality of the gas phase refrigerant.