Ryndiuk S. Method of determining the thermal conductivity of building materials and wares

Thesis research presents the analytical and experimental study of heat-conducting of building materials and wares. In theory the methods of determination of heat-conducting of multi-layered building materials and determine of the temperature field are investigational one and multi-layered building constructions. Experimental studies of change of temperature are undertaken in a construction not only on opposite verges but also in every layer of material by establishment of thermocouples, as on the joints of materials so in them. That gave the opportunity to confirm a non-linear dependence of the temperature distribution in the structure, that is, in one part of the warming observed linear dependence and the other linear. For a more detailed understanding of the process of internal heat transfer in the structure, it is necessary to know not only the functional changes of temperature with time, but their rate of change, which are easily found on the basis of experimental data. Such dependences allow us to determine the most important characteristics of non-stationary heat transfer: gradient and temperature gradient. The method of solving nonlinear problems of heat-conducting is offered taking into account the changes of the temperature gradient that allows to obtain a more accurate calculation heat-conducting of construction and knowing the different coefficients of heat-conducting of materials to investigate the temperature field of multi-layered constructions of different character. Also the method of calculation of heat-conducting of multi-layered building constructions got further development in two-dimensional case taking into account subject to boundary conditions of the first, second and third kind. The practical value of work consists in that the worked out method will allow more exactly to determine distribution of temperature in multi-layered building materials and wares, that will give an opportunity to develop more effective warming materials and more effectively compose multi-layered materials, that will decrease the cost of утеплювача and more exactly to determine a dew point. Application of the proposed method is organized with the insulation of a 9-storey house by a company «DEVELOPMENT BUILDING GROUP», which consists in calculating the thickness of insulating material. In comparison with existing methods the economic effect amounted to UAH 20011, which was achieved by reducing the number of insulated material.