THERMODYNAMIC PROPERTIES OF AN AZEOTROPIC FREON-22 AND FREON-115 MIXTURE,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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An azeotropic mixt. of Freon-22, 48.8, and Freon-115, 51.2, has a b.p. of -45.6C. Its vol. cooling power is considerably higher than that of Freon-12, Freon-22, and Freon-115. This mixt. is neither explosive nor toxic. Two equations for calculating the vapor pressure were used ln p A 100 BT C ln T100 - DT100 to the 6th power and P RTv double prime cT - fv double prime sq. aT - bv double prime sq., where p is the pressure in atm. abs., A 7.246308, B -13.738168, C -3.3686219, D -0.000048709009, P is the pressure in kg.sq.m. abs., v double prime is the sp. vol. of dry satd. vapor, a -0.000006274858, b -0.0044939876, c 0.029740256, f 15.951252, R 7.5920074, and T is the temp. in degrees K. In the temp. range from 203.16 to 323.16K, the max. deviation between the pressure values obtained from these equations was 0.09. Thermodynamic properties and sp. vols. of the super-heated vapor are given. The mixt. may be used in industrial equipment designed for operation with NH3 and Freon-22.
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