Excess enthalpies for two ternary systems (1-butanol-2-butanol-n-heptane and 1-hexanol-cyclohexanol-n-nonane) and three binary systems (2-butanol-n-heptane, 1-hexanol-cyclohexanol and cyclohexanol-n-nonane) at 298.15 K have been measured with a Calvet-type microcalorimeter. The Redlich-Kister equation and the UNIFAC(3Q), a version of UNIFAC, fitted to binary H-E data, have been applied in predicting ternary excess enthalpies. New group interaction parameters of this version have been determined.