DEVELOPMENT OF FUNDAMENTAL EQUATION OF STATE FOR THERMODYNAMICS PROPERTIES OF HFO-1336MZZ(Z)

• Main Author: Oktavianus Sumarlin, William
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/65306
• Institution: Institut Teknologi Bandung

The need for refrigerants that have low ODP and GWP values has caused many researchers to develop new types of refrigerants. One type of new refrigerant that has a low GWP and ODP value is HFO-1336mzz(Z). HFO-1336mzz(Z) is an alternative refrigerant to replace HFC-245fa in the rankine organic cycle and also high temperature heat pumps. Development of EOS for refrigerants HFO-1336mzz(Z) was done only by McLinden and Akasaka (2020). This study add experimental data from Sun et al. (2019), Li et al. (2020), and Sakoda et al. (2020) for development EOS. Therefore, new EOS need to be developed to predict thermodynamic properties with better accuracy. The EOS for this study uses the helmholtz EOS. The helmholtz equation has a function of temperature and density to calculate all thermodynamic properties in liquid and vapor phases. Development of helmholtz EOS for this study used genetic algorithm and weighted least squares regression methods. All data needed to develop helmholtz EOS are in the range from the triple point to a maximum pressure and temperature limit. The EOS of this study has an average absolute deviation of 1.40×10-3% for the isobaric heat of ideal gas, 0.334% for saturated vapor pressure, 0.426% for density in liquid phase, 0.873% for density in vapor phase, 0.169% for saturated liquid density of single phase, 0.798% for saturated vapor density of single phase, 1.44% for saturated specific heat, and 0.0667% for speed of sound in vapor phase. The EOS can be used to predict the thermodynamic properties from triple point temperature up to a temperature of 700 K and a pressure of 100 MPa. The ideal gas characteristic curve and the behavior of the second and third rational virial coefficients can be derived from the EOS.