1995-07-01

Reduced Expressions for Thermophysical Properties of Fluid Loop Used Non-CFC Coolants 951679

Investigated in this study are thermodynamic and transport properties of FC-72, -84, -77, -75, -40, -43, -70; FX-3250, -3300; PF-5050, -5060, -5070, -5080; and DF134a. All the fourteen are non-CFCs(non-chlorofluorocarbons), substitutable for commonly used coolants like Freons and not destroying ozon layers. The collected property data has mathematically been handled to reduce to proposed empirical formulas. Finally obtained are temperature-dependent algebraic expressions for the saturated vapor pressure, the saturated liquid density, the specific heat at constant pressure of liquid, the thermal conductivity of liquid, the kinematic viscosity of liquid, the surface tension of liquid, the latent heat of vaporization, the specific enthalpy of liquid, and that of vapor. All the coefficient values are listed in the tables along with applicable temperature ranges and prediction errors. Derived expressions of prime importance are the dynamic viscosity, the thermal diffusivity, the Prandtl number, the pumping factor, the liquid transport factor, the wicking height factor, and the gas control sensitivity factor. The saturated vapor pressure, the dynamic viscosity, and the above four factors are displayed in the figures for the purpose of contributing coolant selection.

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