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Title: Changes in the transfer function of a flow microcalorimeter
Authors: Socorro, F. 
Rodríguez de Rivera, M. 
UNESCO Clasification: 2213 Termodinámica
220408 Líquidos
Keywords: Liquid mixtures
Conduction calorimeter
Flow microcalorimeter
Signal processing
Thermal measurement, et al
Issue Date: 2003
Publisher: 1388-6150
Journal: Journal of Thermal Analysis and Calorimetry 
Conference: 8th European Symposium on Thermal Analysis and Calorimetry (ESTAC-8) 
Abstract: Flow microcalorimeters are used to determine thermodynamic properties of liquid mixtures, the accuracy of these measures depends on the right calibration of the instrument. In this work the system is identified by means of the transfer functions of the two poles, it is proven that the first time constant and the sensitivity change with the value of rc p f of the injected liquids (r - density, c p - heat capacity, f - injection flow), and that the sensitivities obtained in the electrical and chemical calibrations are different for the same value of rc p f because the dissipation in each case does not occur in the same place. As a summary of the calibration carried out, it is proposed a sensitivity value of 313±4 mV W-1 for rc p f<15 mW K-1 that permits to make thermal measures with an uncertainty of 3%.
ISSN: 1388-6150
DOI: 10.1023/A:1023995014333
Source: Journal of Thermal Analysis and Calorimetry [ISSN 1388-6150], v. 72, p. 47-55
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