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Application of Procedures to Calculate Thermodynamic Properties of Carbon Dioxide, HFC-134a and HCFC-22  

Park Hyoung Joon (R&D, Janghan Engineers, Incorporated)
Park Kyoung Kuhn (School of Mechanical and Automotive Engineering, Kookmin University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.12, no.4, 2004 , pp. 176-183 More about this Journal
Systematic methods to calculate thermodynamic properties of carbon dioxide, HFC-134a and HCFC-22 are presented. First, application of a basic method to identify the saturation state with given temperature or pressure is attempted and the feasibility of auxil­iary equations is tested. Next, detailed procedures are suggested to tell a phase when tem­perature/pressure and another property are specified. Finally the Newton-Raphson method is applied to calculate unknown thermodynamic properties fixing the state with the two inde­pendent properties specified. The procedures described here are utilized to develop a computer program, which is used to find the relation between temperature and pressure with maximum isobaric heat capacity for super-critical carbon dioxide.
Carbon dioxide; HFC-l34a; HCFC-22; Property calculation; Thermodynamic property;
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