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Method of research of heat-insulating properties of materials

autorzy: Andrii Semenenko

The invention is devoted to the topic of creating modern technologies for the study of thermal insulation properties of materials and the development of methods for measuring the thermal conductivity of thermal insulation materials. The existing methods of research of heat-insulating properties of materials those which allow measuring the coefficient of thermal conductivity of heat-insulating materials are analyzed. The own technique of research of heat-insulating properties of materials which allows to measure their coefficient of thermal conductivity, to estimate conformity of actual characteristics of the basic working properties to those characteristics which were declared by the manufacturer is created. The problem of research is associated with the need to create modern technologies for the study of thermal insulation properties of materials that would allow choosing the most economically optimal of them for insulation. The goal is to develop a method for measuring the thermal conductivity of thermal insulation materials. Preservation of non-renewable resources in the modern world is a very important issue. Thermal insulation materials are help with this. They reduce heat loss in the premises, thus saving resources that would be spent on maintaining a stable temperature. Evaluation of thermal insulation properties of materials can be carried out using a theoretically found and experimentally tested in our Junior Academy of Sciences of Ukraine work installation to determine the coefficient of thermal conductivity. This installation is designed algorithm of author's technique allows to carry out research of popular heaters and based on the received results to draw a conclusion concerning heat-insulating qualities of heaters and to evaluate their compliance with the standards stated by the manufacturer. Research hypothesis is the heat flux will directly depend on the electric power of the heater. The relevance of research is in the need to create modern methods for studying the insulating properties of materials that would allow them to choose the most economically optimal for insulation. Methodologies used are an experimental method, validation / testing of the installation, comparison of data with standards and comparative analysis (method) compare the data of the experiment and the manufacturer. There are several possible ways to measure thermal conductivity, each of them are suitable for a limited range of materials, depending on the thermal properties and temperature of the environment. There are two classes of methods for measuring thermal conductivity: stationary and non-stationary (or transient) methods. Stationary measurement methods are used when the temperature of the material does not change over time. This makes the analysis direct. The disadvantage is the expensive, complex, and accurate experimental setup and relatively longer measurement time. Non-stationary methods of measuring thermal conductivity study the signal as a function of time. The advantage of these methods is that they can generally be performed more quickly, as there is no need to wait for a stationary situation. The disadvantage is that the mathematical analysis of data is generally more complex. The results of the invention is devoted to the development of research methods thermal insulation properties of materials became the basis for the following conclusions: 1. The analysis of existing methods is researched heat-insulating properties of materials, in particular such that allow measuring the coefficient of thermal conductivity of heat-insulating materials. Among the disadvantages of existing methods are the relatively high cost of methods, long test time, as well as a rather complex mathematical analysis of experimental data. 2. The technique of research of heat-insulating properties of materials which allows to measure their coefficient of thermal conductivity, to estimate conformity of actual characteristics of the basic working properties to that were declared by the manufacturer is created. 3. An experimental sample of a measuring device is created thermal conductivity coefficient and the results of experimental studies of thermal insulation materials. This installation was introduced into the educational process in physics at the Zaporizhzhya Multidisciplinary Lyceum No99 and Zaporizhzhya National University as part of the training of students of the subject specialty "Secondary Education (Physics)".

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