Розглянуто стаціонарну нелінійну осесиметричну задачу теплопровідності для термочутливого шару, який нагрівається внутрішніми джерелами тепла і тепловим потоком. Отримано аналітичний розв’язок цієї задачі та виконано числовий аналіз для заданої залежності коефіцієнта теплопровідності матеріалу шару від температури.
Розглядається стаціонарна нелінійна задача теплопровідності для термочутливої смуги, яка нагрівається внутрішніми джерелами тепла і тепловим потоком. Отримано аналітичний розв’язок цієї задачі та виконано числовий аналіз для заданої залежності коефіцієнта теплопровідності матеріалу смуги від температури.
Linear and nonlinear mathematical models for determining the temperature field and subsequently analyzing temperature regimes in isotropic spatial media with semi-through foreign inclusions subjected to internal and external thermal loads are developed.
Linear and nonlinear mathematical models for determining the temperature field, and later the analysis of temperature regimes in isotropic spatial inhomogeneous media exposed to internal and external thermal loads have been developed. To do this, the thermal conductivity for such structures is described as a whole using symmetric unit functions, which allows us to consider boundary thermal conductivity problems with one linear and nonlinear differential equation of thermal conductivity with discontinuous coefficients and linear and nonlinear boundary conditions on boundary surfaces.
Separate mathematical models for determining the temperature distribution in the elements of turbogenerators have been developed, which are described geometrically by an isotropic half-space and a heat-sensitive space with locally concentrated sources of heating. For this purpose, using the theory of generalized functions in a convenient form, we write the initial differential equations of thermal conductivity with boundary conditions.
The promising environmentally friendly solar heating systems are based on the combined solar collector, in which the absorber made of constructive material of low-energy house was described. The usage of the combined absorber with an external protection of low-energy house ensures sufficient efficiency of combined solar collector and reduces its cost. Three-factor planning matrix with the factors interaction was developed.
The materials of the article the radial heat flow, which is present in a fire, and analyzed factors flame from which the heat flow is dependent. Based on experimental studies installing dependence heat flux changes with distance, and the influence of environmental parameters in which the radial heat transfer on the intensity of radiation energy flame. Based on the studies identified and specified coefficient weakening energy radiation flame small water spray.
This article examines the efficiency of helioroof in natural conditions. Modern energy development is characterized by a significant increase in energy costs. In recent decades, in many countries there is environmental degradation due to the increasing number of fossil fuels, and as a result, increasing concentration of greenhouse gases in the atmosphere. The need to replace non-renewable energy sources associated not only with their depletion, but also the danger of global scale, which is created by burning coal, oil, gas, peat and the increase of CO2 in the atmosphere.
Feasibility of using alternative energy sources, current state and prospects of solar energy development is analyzed. Today, it is important to improve and develop new solar panels that would reduce their costs and increase efficiency. Efficiency of helioroof in the solar heating system with forced movement of coolant is analyzed. It is shown that heat can be used effectively with roofing building material. The results of research of incoming flow of solar radiation on the helioroof are described.
This paper presents two-dimensional numerical models of the thermal structure of the crust and upper mantle in the Carpathians region based on new seismic data along the profile Dobre-3 (PANKACE) from East European Craton to Pannonian basin (PB). Heat flow and temperature distribution in the crust can be explained by lithosphere structure and Cenozoic tectonic and magmatic activity.