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      EVALUACIÓN DE LAS PÉRDIDAS TÉRMICAS EN CALORIMETRÍA ISOPERIBÓLICA. IMPORTANCIA DE LOS ALREDEDORES EN LA OBTENCIÓN DE CONSTANTES INSTRUMENTALES Translated title: EVALUATION OF THE THERMAL LEAKAGE IN ISOPERIBOLIC CALORIMETRY. IMPORTANCE OF THE ENVIRONS IN THE OBTAINING OF INSTRUMENTAL CONSTANTS

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          Abstract

          Para tres unidades calorimétricas con aislamientos en PVC, nailon y metálico se determina la constante de fugas térmicas, K, con valores de 6,50 x 10-3, 6,37 x 10-5 y 2,52 x 10-4 s-1, respectivamente. Se determina la capacidad calorífica del sistema con agua para cada una de las unidades calorimétricas y se obtienen valores para esta constante de 442,1 J °C-1 para la celda con aislamiento en PVC, 206,7 J °C-1 para la celda con aislamiento de nailon y 408,2 J °C-1 para la celda con aislamiento metálico. Se establece la influencia de la magnitud del efecto térmico en las pérdidas térmicas y en la constante de fugas térmicas, para trabajos eléctricos entre 0,5 y 3,4 kJ. Se determina la entalpía de solución para el sistema propanol-agua, con resultados similares para las tres unidades calorimétricas del orden de 10,7 kJmol-1 .

          Translated abstract

          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.

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          Isothermal microcalorimetry near ambient temperature: An overview and discussion

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            Non-linear resistors

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              Current trends in precise calorimetry

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcq
                Revista Colombiana de Química
                Rev.Colomb.Quim.
                Departamento de Química, Universidad Nacional de Colombia. (Bogotá )
                0120-2804
                December 2005
                : 34
                : 2
                : 147-159
                Affiliations
                [1 ] Universidad Nacional de Colombia Colombia
                [2 ] Universidad de Los Andes Venezuela
                Article
                S0120-28042005000200005
                4aa4c961-fb1f-4d57-8152-ff4700915059

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Colombia

                Self URI (journal page): http://www.scielo.org.co/scielo.php?script=sci_serial&pid=0120-2804&lng=en
                Categories
                CHEMISTRY, MULTIDISCIPLINARY

                General chemistry
                isoperibolic calorimetry,thermal losses,insulation heat,thermistor,temperature measurement,heat capacity,calorimetría isoperibólica,fugas térmicas,aislamiento térmico,termistor,medida de temperatura,capacidad calorífica

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