An average, R12 evaporative heat transfer refrigerant correlation has been developed for the mass flux range of 25-100 kg/m2-s and the heat flux range of 2-10 kW/m2. Local correlations for the refrigerant mixtures 65% R22/35% R123 and 80% R22/20% R141b have been developed for the respective mass flux ranges of 25-85 and 27-42 k/m2-s and heat flux ranges of 1.2-2.8 and 1.0-4.2 kW/m2. The mixtures heat transfer coefficients were approximately 50% lower than the predicted R12 coefficients for overlapping ranges of mass and heat flux. The pure refrigerant data were gathered in a horizontal tube test stand. The mixture data were gathered by performing an energy balance about a full evaporator.