DEVELOPMENT OF FUNDAMENTAL EQUATION OF STATE FOR THERMODYNAMIC PROPERTIES OF R-1123
Refrigerant usage in refrigeration and air conditioning systems has negative impacts on the environment such as ozone layer depletion and global warming. R-1123 is new hydrofluoroolefin (HFO) refrigerant with low ozone depletion potential (ODP) and low global warming potential (GWP). R-1123 is expec...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/64827 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Refrigerant usage in refrigeration and air conditioning systems has negative impacts on the environment such as ozone layer depletion and global warming. R-1123 is new hydrofluoroolefin (HFO) refrigerant with low ozone depletion potential (ODP) and low global warming potential (GWP). R-1123 is expected to be the alternative of hydrofluorocarbon (HFC) refrigerants replacement that commonly used today. Thermodynamic properties are indispensable in designing and analysing refrigeration and air conditioning systems. Therefore, the development of fundamental equation of state is necessary to represent thermodynamic properties of R-1123.
The equation of state in this study was developed based on helmholtz free energy and available experimental data. All thermodynamic properties in the liquid, vapor, dan saturated phases can be derived explicitly from the equation of state. The optimization process of the equation uses genetic algorithm combined with least squares method.
The fundamental equation of state has average absolute deviation of 0.219% for ideal gas isobaric heat capacity, 1.02% for liquid density, 0.712% for vapor density, 0.713% for saturated vapor pressure, 0.836% for saturated liquid density, 2,62% for saturated vapor density, and 0.0274% for speed of sound in the gaseous phase. From the assessment of the extrapolation behavior and idealized curves, the equation of state can be used to predict the thermodynamic properties of R-1123 from triple point to temperature of 750 K and pressure of 100 MPa.
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