Affiliation:
1. Institut Teknologi Bandung
Abstract
R-1243zf is a new refrigerant that could replace R-134a. Its thermodynamic properties represented in the equation of state (EOS) play an essential role in analyzing and designing thermal systems. The EOS exists without including caloric property data due to unavailable data during the development time. New EOS was developed explicitly in Helmholtz free energy and optimized to represent the experimental data accurately and maintain thermodynamic consistency. The optimization process undergoes using a genetic algorithm and weighted-least squares regression. The experimental data used in the optimization have a range of 233–430 K and 0.106–34.6 MPa and were validated from the extrapolation and consistency to confirm the reliability. The average absolute deviation from the data is 0.48% for the ideal gas isobaric specific heat, 1.7% for the isochoric specific heat, 0.33% for the speed of sound, 0.22% for the liquid density in single-phase, 0.49% for the vapor density in single-phase, 0.96% for the vapor pressure, 2.2% for the saturated liquid density, and 3.2% for the saturated vapor density. The EOS has a reasonable extrapolation behavior from the triple point up to 700 K and 100 MPa.
Publisher
International Centre for Applied Thermodynamics (ICAT)
Subject
General Engineering,Condensed Matter Physics
Reference22 articles.
1. UN, Amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer, New York: United Nations, 2016.
2. B. Gil, J. J. Kasperski, "Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement," Energies, 11(8), 2136, 2018, doi: 10.3390/ en11082136.
3. JSRAE, "Risk Assessment of Mildly Flammable," JSRAE, Tokyo, 2015.
4. N. A. Lai, "Thermodynamic Properties of HFO–1243zf and Their Application in Study on a Refrigeration Cycle," Applied Thermal Engineering, 70(1), 1–6, 2014, doi: 10.1016/j.app lthermaleng.2014.04.042.
5. R. Akasaka, "Recent Trends in the Development of Helmholtz Energy Equations of State and Their Application to 3,3,3-Trifluoroprop-1-ene (R-1243zf)," Science and Technology for the Built Environment, 22(8), 1136–1144, 2016, doi: 10.1080 /23744731.2016.1208000.