The article discusses the influence of the distance between the axes of pipes laid on the efficiency of the temperature distribution in the floor heating system. Using the computational experiment was simulated the temperature field on the surface of the floor heating. The calculations are performed using the program ELCUT.
Keywords: underfloor heating, numerical simulation, temperature field, the temperature of the feed piping system radiant heating
The paper presents a developed mathematical model for analyzing the dynamics of thermal losses. The influence of the massiveness of the enclosing structures on the propagation of the heat flux is substantiated. The developed model makes it possible to estimate how the heat load of the heating system of the room under consideration changes over time. Analysis of the dynamics of the change in the heat load can help in choosing a method for regulating the heat transfer of heating devices
Keywords: Dynamics of heat losses, constructions of different massiveness, control range, thermal load, amplitude of oscillation
In the article the technique of calculation of thermal protection of protecting designs for economic reasons. In connection with constant growth of prices for electric and thermal energy, which is observed during the last years, particularly relevant is the problem of thermal protection of enclosing structures of buildings for energy savings. But still, the arguments for increasing the level of thermal protection of buildings are often of a declarative nature and is quite convincing as the random data from foreign sources, which are presented without analysis the lawfulness of their Association with the domestic data. The purpose of this study is to study methods of economic analysis increase in the level of thermal protection of enclosing structures. This article analyzes the economic feasibility of insulating the enclosing structures to a level that exceeds the sanitary-hygienic requirements.
Keywords: insulation, building envelope, method of minimum reduced costs, energy saving, thermal insulation material, energy-saving, operational performance
The article describes the dependence of the heat requirements of the building from the outside air temperature and presents the results of mathematical modeling as a universal dependence. Received data percentage develop heat chillers and represented the ideology of charting the generation and consumption of heat. Made calculations and numerical analysis of heat balance in a supplementary heat source.
Keywords: Standing temperature, climatic parameters, thermal load, mathematical model, estimation of efficiency, chiller, heat pump
Reconstruction of buildings inevitably entails improving the thermal protection of premises, however, the development of measures for the thermal insulation of the existing building structures is impossible without evaluation of thermal characteristics of these structures, primarily the resistence to heat transfer. Evaluation of the materials according to their characteristics reference is often not possible. The main causes is the lack of information about construction materials to the inner layers of the long-erected buildings. Arise a number of difficulties in conducting field surveys due to the practical absence of the stationary conditions. Heat flux on the surface can change simultaneously with changes in temperature, as walling have thermal inertia, and need some time to change the temperature distribution in the structure thickness. To determine the actual heat transfer resistance of enclosing structures must take into account the dynamics of change of temperature and heat flow on the surface of the enclosure. When determining the actual heat transfer resistance needs to consider the time distribution of heat waves through the walling.
Keywords: non-stationary thermal conditions, cladding, thermophysical characteristics, thermal resistance
To describe the dynamics of the temperature field in the surface layers of the earth taken up the heat balance of the earth's surface. Taken into account are three components of the heat flow: convective heat transfer with air, solar radiation, heat flow from the surface layers of the soil. The boundary conditions on the surface of the soil is considered the temperature of the ground surface, which is determined from the heat balance of the surface layer of the sun radiation. The temperature distribution in the soil is determined using the method of finite differences. A layer of soil has a certain thermal inertia, which leads to delaying the achievement of minimum temperatures in the soil column relative to the time of achievement of the minimum surface temperature. In the surface layer of soil to a depth of approximately 300 mm, is almost complete attenuation of the diurnal temperature fluctuations in the month of June with account of solar radiation in conditions of the South of Russia.
Keywords: heat pump, возобнавляемые sources of energy, solar radiation, transient mode, soil
The existing methods of calculation of the annual change in soil temperature. Identified areas of their application and the possible deviations from reality. The requirements to the boundary conditions of the calculation. Defines the principles of the choice of initial conditions. The preconditions for the development of a universal method of calculation.
Keywords: heat pump, renewable energy, solar radiation, transient mode, soil
The article presents the analysis of the dynamics of thermal load of the heating systems of the building. Shows the thermal load taking into account climatic conditions of construction. Described algorithm of calculation of the temperature field around the ground, umbrellas and energy consumption for the work of the heat pump. Presented clarification of power reserve source of heat energy.
Keywords: heat pumps, earth probe, standing temperatures, the area of use