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• W3130437401 abstract "Anticorrosive coating of pipes, precipitation of hardness salts on the walls of pipes in hot water supply systems, heating, refrigeration systems, in coils for charging and discharging heat accumulators, coils of heat exchangers and a multilayer structure of metal-plastic pipes for the heating system and for the floor heating systems is an additional thermal resistance for the transfer of heat from the coolant to the environment. This resistance must be taken into account when calculating heat transfer from the pipe surface, both to increase the efficiency of heat exchangers and to calculate unproductive heat losses to the environment from main pipelines and risers of engineering systems. During the design process, the specialists are faced with the question of how to reduce or increase the heat transfer of 1 m of a steel pipe. To increase, you need to change the infrared radiation up. This is done with paint. Red color enhances heat dissipation. It is better if the paint is matte. Another approach is to install ribs. They are mounted externally. This will increase the heat transfer area. And for a warm floor system or a coil immersed in a solid medium (for example, a ground collector of a heat pump or a coil for charging / discharging a heat accumulator with a solid heat storage material), it is necessary to correctly calculate the heat transfer of 1 m of the pipe in order to ensure heating or cooling of this pipe to the required parameters. When do you need to decrease the parameter? The need arises when optimizing a section of the pipeline located outside the residential area, in an unheated volume. Then experts recommend insulating the site - isolating it from the external environment. According to M. Jacob's data, the formulas for heat transfer by thermal conductivity through flat walls can often be applied with sufficient accuracy for cylindrical walls, if the heat transfer surface is taken along the average thickness. Moreover, a large number of practical problems of calculating temperature fields in multilayer objects can be calculated as one-dimensional. Previously, an analytical solution to the homogeneous problem of non-stationary heat conduction in multilayer objects with stationary boundary conditions of the third kind was proposed. This article discusses the issues of unsteady heat conduction in multilayer objects. A solution to the homogeneous boundary problem with nonstationary boundary conditions of the third kind is proposed. The solution is based on the Fourier variable separation method by the eigenfunctions of the problem and the Duhamel integral. The proposed solution formula has an explicit form and, due to the recurrent form of writing the basic relations, can be useful in numerous calculations." @default.
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• W3130437401 date "2020-11-30" @default.
• W3130437401 modified "2023-09-26" @default.
• W3130437401 title "THE USE OF THE METHOD OF SEPARATION OF VARIABLES (FOURIER) FOR SOLVING BOUNDARY PROBLEMS OF UNSTATIONARY HEAT CONDUCTIVITY IN A MULTILAYER MEDIUM" @default.
• W3130437401 doi "https://doi.org/10.32347/2076-815x.2020.75.371-378" @default.
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