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Thermodynamic Properties of Mixtures Based on van der Waals Equation of State: R-32/125 Binary System
The increasingly urgent need to replace the familiar refrigerant compounds (chlorofluorocarbons) has required the development of a new class of compounds, termed hydrofluorocarbons. Accurate thermodynamic properties of these new compounds are critically important for the manufacturing industries to develop new equipment. Several pure refrigerants have been modeled with high accuracy using many-term virial expansion equations of state such as a modified Benedict-Webb-Rubin equation (MBWR). However, many proposed refrigerant mixtures have not been as accurately modeled as the pure refrigerants. The present study is an attempt to provide a solution to this deficiency. Using the classical van der Waals equation of state with few empirical modifications, the general mixture equations of state have been developed with accuracy similar to pure compound equations of state such as the MBWR. The model has been applied to R-32 (CF2H2) and R-125 (CF3-CF2H) mixtures, with accuracy within about 1% for pressure, temperature, volume, composition, enthalpy, and entropy over a wide range of the state variables.
Thermodynamic Properties of Mixtures Based on van der Waals Equation of State: R-32/125 Binary System
The increasingly urgent need to replace the familiar refrigerant compounds (chlorofluorocarbons) has required the development of a new class of compounds, termed hydrofluorocarbons. Accurate thermodynamic properties of these new compounds are critically important for the manufacturing industries to develop new equipment. Several pure refrigerants have been modeled with high accuracy using many-term virial expansion equations of state such as a modified Benedict-Webb-Rubin equation (MBWR). However, many proposed refrigerant mixtures have not been as accurately modeled as the pure refrigerants. The present study is an attempt to provide a solution to this deficiency. Using the classical van der Waals equation of state with few empirical modifications, the general mixture equations of state have been developed with accuracy similar to pure compound equations of state such as the MBWR. The model has been applied to R-32 (CF2H2) and R-125 (CF3-CF2H) mixtures, with accuracy within about 1% for pressure, temperature, volume, composition, enthalpy, and entropy over a wide range of the state variables.
Thermodynamic Properties of Mixtures Based on van der Waals Equation of State: R-32/125 Binary System
Yokozeki, A. (author)
HVAC&R Research ; 2 ; 284-310
1996-10-01
27 pages
Article (Journal)
Electronic Resource
Unknown
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