Heat transfer coefficients in nucleate boiling on a smooth flat surface were measured for pure fluids of R-134a

propane

isobutene

and their binary and ternary mixtures at different pressures from 0.1 to 0.6 MPa. Series of experiments with different heat flux and mixture concentrations were conducted.Compared with the pure components

binary mixtures show lower heat transfer coefficients.This reduction was more obvious at the high heat flux.Several heat transfer correlations were obtained for pure refrigerants and multicomponent mixed-refrigerants.