Equations of State for Several Fluorocarbon Refrigerants : First Report : Saturated and Critical Property Values

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Abstract
In accordance with the recent developments in refrigeration engineering, the necessity to utilize the fluorocarbon refrigerants has increased. Hence it becomes quite essential to establish the thermo-dynamically consistent formulations in wide ranges of state parameters of these substances. For this purpose, new correlations of the saturation pressure and of the saturated liquid density have been devised for six typical different fluorocarbons such as R-12, R-13, R-21, R-22, R-23 and R-C318. Using these devised correlations with an aid of Cailletet-Mathias law, a set of most probable critical property values with their estimated uncertainties have also been derived. Additionally the necessity to derive the rational expressions for the thermodynamic consistency which have to be satisfied by the proposed formulations at the critical point is stressed and those expressions could be derived taking into consideration the estimated uncertainties of the critical property data.

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