Methods and Means of Quasi-Differential Calorymetry

• Main Author: L. Vorobiov
• Format: Article
• Language: English
• Published: LLC Production and Commercial Company «FAVOR, LTD» 2018-03-01
• Series: Метрологія та прилади
• Subjects: differential and quasi-differential calorimetry, thermocouple battery, thermometric shell, heat flow calorimeter, heat of combustion, heat capacity
• Online Access: https://mmi-journal.org/index.php/journal/article/view/9

The methods and means of quasi-differential calorimetry are considered, which allow improving the operational and metrological characteristics of the heat flow calorimeters. Application of a compensation cell with a smaller size than the working one ensures the preservation of the advantages of the differential circuit and reducing mass-dimensional characteristics. The use of a special simulator of a reaction vessel with adjustable thermal resistances ensures similarity of the frequency characteri­stics of calorimetric cells. Application of the method of multi-referent quasi-differential calorimetry allows providing the necessary frequency response of the compensation cell by independent adjust of the parameters of several sensitive elements. Multi-cells quasi-differential calorimetric systems allow the use advanta­ges of differential devices and increase the productivity of measurements. The principles of work are considered and the basic technical characteristics of the created pyranometers and devices for measuring radiation heat flux, heat of fuels combustion and heat capacity are given.