Experimental excess molar enthalpies H-m(E) at the temperature 298.15 K and atmospheric pressure in a flow microcalorimeter are reported for the ternary mixtures: {x(1)CH(3)OH+x(2)C(2)H(5)OH+(1-x(1)-x(2))C5H10O} and {x(1)CH(3)OH+x(2)C(2)H(5)OH+(1-x(1)-x(2))C4H8O2}. The results have been correlated by means of a polynomial equation and used to construct constant excess enthalpy contours. Further, the results have been compared with those calculated from a UNIQUAC associated-solution model taking into consideration the molecular association of like alcohols, solvation between unlike alcohols and alcohols with oxane (tetrahydropyran) or 1,4-dioxane using only binary information. (C) 2003 Elsevier Ltd. All rights reserved.