Computer Simulation Of Temperature Field Research Articles

Assessment of heat protection characteristics of building enclosing structures of the building of the men’s monastery

The article presents the results of a thermal imaging study and thermal engineering calculation of the building enclosing structures of the monastery hotel building in the village of Vinnovka, Stavropol district, Samara region. The survey was conducted in order to determine the causes of low temperatures in the hotel premises. According to SP 50.13330.2012 Thermal protection of buildings, energy saving standards in construction do not apply to religious buildings. The level of thermal protection of the above buildings is determined by the provision of modern sanitary and hygienic standards. Based on computer simulation of temperature fields in the outer walls, made in the form of well masonry with the use of polystyrene concrete as insulation, it was found that the value of the reduced resistance to heat transfer they meet regulatory requirements. The actual values of the reduced resistance to heat transfer of the exterior walls, obtained by the results of thermal imaging examination, in the lower part of the exterior walls in individual rooms were significantly lower than the standard ones, which leads to increased heat loss and, as a consequence, to cooling of the indoor air. The reasons for the lowered air temperatures in the hotel premises have been established and recommendations have been developed to eliminate the above-mentioned defects.

Computer simulation of temperature fields in the Cr (film)-Zr (substrate) system during pulsed electron-beam irradiation

The paper presents the results of numerical simulation of the distribution of thermal fields during the formation of Cr-Zr surface alloy using a pulsed low-energy high-current electron beam (LEHCEB). The melting thresholds of the Cr-Zr system for different thicknesses of Cr films were calculated. The melting threshold of the Cr-Zr system increases linearly with increasing Cr film thickness. A linear regression dependency model of the melting threshold on the film thickness is proposed. Evaporation thresholds of the Cr-Zr system for different thicknesses of Cr films were calculated. The evaporation threshold of the Cr-Zr system increases linearly with increasing Cr film thickness. A linear regression dependency model of the evaporation threshold on the film thickness is proposed. The value of the LEHCEB energy density at which the lifetime of the film and substrate are equal is calculated. This value is a maximum value for the effective formation of Cr-Zr. A model of the LEHCEB energy density, at which the lifetime of the film and the substrate are equal, in the form of a third-degree polynomial is proposed.

ASSESSMENT OF THERMAL PROTECTIVE CHARACTERISTICS OF WELL MASONRY WITH THE USE OF NO-FINE EXPANDED-CLAY LIGHTWEIGHT CONCRETE

As part of the implementation of programs for the resettlement of dilapidated housing and rural construction, special attention is paid to the construction of low rise energy efficient buildings. Analysis of various technologies for the construction of low rise buildings revealed the feasibility of using expanded clay concrete as a structural and insulating material in three layer exterior walls and well laying. The presented heat engineering calculation of the original construction of the well masonry showed rather high values of the reduced heat transfer resistance and the coefficient of heat engineering uniformity. Rather high accuracy of the presented engineering technique of thermal engineering calculation is confirmed by comparison of the received data on resistance to heat transfer of an external wall by the approximate analytical method with data of computer simulation of temperature fields by a finite element method.

Computer simulation of temperature fields in a six-punch high-pressure apparatus with a change in the composition of the composite heater

Computer simulation of temperature fields in a six-punch high-pressure apparatus with a change in the composition of the composite heater

Моделирование температурного поля воздушных фурм доменных печей

Моделирование температурного поля воздушных фурм доменных печей

Comparison of mineral oil and esters as cooling liquids in high voltage transformer in aspect of environment protection

The article presents the results of computer simulation of temperature field of transformer filled with mineral oil and alternatives insulating liquids which include synthetic and natural esters. The analysis was based on the results of computer simulation of temperature field of 10 MVA distribution transformer, using the program COMSOL Multiphysics.

Computer Simulation of Temperature Field for Be/HR-1 Stainless Steel by Diffusion Bonding

In order to provide the best technic parameter for hot pressing, the diffusion bonding temperature fields of Be/HR-1 stainless steel under different cooling methods were simulated by the finite element method. The results show that high temperature parts occur in stainless steel center zone in water cooling and air cooling, and the interface cooling rates follow respectively equation of T = 0.0297 t 2 - 9.3223 t + 1017.6 and equation of T = 0.002 t 2 - 0.7702 t + 1014.8. In funace cooling, high temperature part moves to beryllium center zone and the interface cooling rate follows equation of T = -0.0192 t + 1018.8. While the heat transfer coefficient (h) is taken as 5, the temperature distribution of both sides on the interface is symmetric and temperature gradient is the lowest, so the hot stress on the interface is reduced effectively to improve the diffusion bonding strength, which results fit with the experience ones well.

Computer simulation of temperature field of multilayer pyroelectric thin film IR detector

Multilayer pyroelectric thin film IR detector uses the pyroelectric effect to transform temperature variation to corresponding electrical signal. Large temperature variation rate in pyroelectric film is very important for high response of the pyroelectric thin film IR detector. In this paper, a finite element modeling (FEM) using ANSYS applied to simulate the temperature field of multilayer pyroelectric thin film IR detector. The results show that the porous silica film as a thermal-insulation layer obviously reduced the heat loss due to the conduction of heat from the pyroelectric film to the Si substrate. Temperature variation rate in pyroelectric film with 6 μm porous SiO 2 film is one order of magnitude higher than those without porous silica film. Other factors that influence temperature variation rate in pyroelectric film are also discussed.

Computer simulation of temperature fields in mechanised plasma-arc welding

The process of the mechanised plasma-arc butt-welding of thin-gauge mild-steel sheets has been studied, both theoretically and experimentally. The transient temperature distribution has been computed using an analytical model due to Rosenthal. The results have then been compared with those generated by finite-element analysis using the commercial package PAFEC. The two sets of results were found to be in reasonably good agreement; moreover, the theoretical values were found to correlate fairly well with the results of experiments performed on a Messer Griesheim Uniwig G-200P plasma-arc welding machine. The extent of the heat-affected zone (HAZ) in the butt-welded specimens has been computed by analysing the temperature history at points lying transverse to the weldment: the theoretical values match fairly closely with those obtained from the welding experiments. The efficiency of the plasma-arc welding process has been estimated to be around 32% to 35%.