Abstract

GIRALDO G, Liliana; CUBILLOS, Gloria Ivonne  and  MORENO P, Juan Carlos. EVALUATION OF THE THERMAL LEAKAGE IN ISOPERIBOLIC CALORIMETRY. IMPORTANCE OF THE ENVIRONS IN THE OBTAINING OF INSTRUMENTAL CONSTANTS. Rev.Colomb.Quim. [online]. 2005, vol.34, n.2, pp.147-159. ISSN 0120-2804.

For three calorimetric units with isolations in PVC, nylon and metal, the heat leakage constant, K, is determined, giving values of 6.50 x10^-3, 6.37 x10^-5 and 2.52 x 10^-4 s^-1 respectively. The heat capacity of the system with water for each one of the calorimetric units was determined and values obtained for this constant are of 442.1 JC^-1 for the cell with insulation in PVC, 206.7 JC^-1 for the cell with insulation of nylon and 408.2 JC^-1 for the cell with metallic insulation. The influence of the thermal effect magnitude in the thermal losses and the heat leakage constant, for electrical works between 0.5 and 3.4 kJ is established. Solution enthalpy for the system propanol- water was determined, with similar results for the three calorimetric units of the order of 10.7 kJmol^-1.

Keywords : isoperibolic calorimetry; thermal losses; insulation heat; thermistor; temperature measurement; heat capacity.

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