Abstract
A modern approach to improving energy efficiency and reducing heat losses in the building, heat energy, agricultural and other fields involves the use of modern materials with high heat-insulating characteristics. The main indicators of the quality of heat-insulating materials and products are thermal conductivity and the associated thermal resistance. An analysis of existing methods and instruments for studying thermal conductivity shows that for solid, inhomogeneous, low-heat-conducting materials, the most acceptable are the devices that implement standardized stationary methods, such as a Heat flow meter apparatus and Guarded hot plate methods. The metrological support of these measurements in world practice is based on the reference installations and working standards, in Russia an additional method was introduced using a multi-valued measure of thermal conductivity. In Ukraine, it is currently relevant to create our own metrological base for measuring thermal conductivity, especially in the range of its low values.
In this paper it was proposed a concept and methodology for creating the measuring and computing complex for the precision measurement of thermal resistance and thermal conductivity of materials in the range from 0.02 to 1.5 W/(m K). The design of a heat block is developed that implements a symmetric method for measuring of the heat flux using two identical special heat flux sensors and provided with the active adiabatization system of the measuring cell. The information measurement system of the precision complex is represented by a set of software-controlled units that provide power and control of the heat unit as well as high-precision registration of measurement information and its processing according to a given algorithm with an error of not more than 1.5%, which corresponds to modern requirements for metrological parameters of this type of research.
The paper also presents the results of an experimental study of a number of low-heat-conducting materials that are promising for use as reference measures of thermal conductivity.
The developed precision information measurement system can become the basis of the state standard and implement a verification scheme of calibration of working means for measuring thermal conductivity.
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Acknowledgements
These researches have been performed within of the scientific project № 19 1.7.1.902 «Information measurement system for determination of thermophysical materials and products characteristics».
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Zaporozhets, A. et al. (2022). Information Measurement System for Thermal Conductivity Studying. In: Zaporozhets, A. (eds) Advanced Energy Technologies and Systems I. Studies in Systems, Decision and Control, vol 395. Springer, Cham. https://doi.org/10.1007/978-3-030-85746-2_1
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