Development of Fundamental Equation of State for Thermodynamic Properties of HFO-1234yf
2,3,3,3-tetrafluoropropana or HFO-1234yf is a recent launched refrigerant which is predicted to substitute HFC-134a in automotives. This is supported by regulation European Parliament issued in 2006, which required the use of refrigerants with GWP less than 150 for new cars manufactured in 2011 and...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/32372 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | 2,3,3,3-tetrafluoropropana or HFO-1234yf is a recent launched refrigerant which is predicted to substitute HFC-134a in automotives. This is supported by regulation European Parliament issued in 2006, which required the use of refrigerants with GWP less than 150 for new cars manufactured in 2011 and for all cars started in 2017. DuPont and Honeywell as main manufaturers claimed that HFO-1234yf has very low GWP with atmospheric lifetime 500 times lower than HFC-134a, but has the similar properties that ensure minor changes in components if retrofitting is applied. However, experimental data for its thermodynamic properties is relatively limited.
The development of equation is accomplished by regression method integrated with genetic algorithm. The most updated experimental data is used as input until the period the study finished. Data is sorted by considering the accuracy and distribution density.
This study succeeded in developing fundamental equation of state based on Helmholtz free energy equation to calculate thermodynamics properties explicitly and accurately in broad range. The equation yields absolute average deviation 0.16% for density in one-phase condition, 1.56% for isobaric specific heat, 1.81% for isochoric specific heat, 0.45% for speed of sound, and 0.10%, 0.80%, 2.02%, respectively for pressure, liquid dan vapor density in its saturated condition. The equation exhibits consistent second and third virial coefficient, accompanied by proper thermodynamic properties extrapolation behaviour.
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