A comparative analysis is made of the computed and experimental data to confirm the adequacy of the heat-transfer model and the suitability of this model for determining the effective thermal condutivity of fibrous heat-insulation materials. Optimization calculations of the heat-insulation layer of quickly removable general-purpose heat insulation are performed for a wide range of the average diameter of fibrous materials as compared with the normative method.Thermal insulation is an integral part of the equipment which influences the reliability and cost-effectiveness of the operation of nuclear power plants with VVÉR reactors. Research and development work on upgrading such insulation has been conducted in the last few years. One promising structural solution is quickly removable general-purpose insulation, which makes it possible to quickly free of thermal insulation the equipment and pipeline parts which are to be monitored. This decreases the irradiation dose to workers during the period when the maintenance and preventative work is performed. The possibility of diverse applications also substantially increases the amount of radioactive wastes.Quickly removable thermal insulation consists of modules which are mounted by successive locking connections. A module consists of a protective casing with the heat-insulating material, based on basalt or glass fibers, inserted into it.As a rule, thermal insulation structures with a metal protective casing are used in the first loop; fabric jackets can be used in the second loop. Since thermal-insulation structures in operating nuclear power plants are part of the design, quickly removable general-purpose thermal insulation requires an individual design approach that takes into account the operational action, the site of the insulated object, and the dimensions and configuration of the object. The characteristics of the heat-insulating layer are optimized by performing a simulation during the development and design work in order to reduce the time and cost [1]. The thermotechnical characteristics were determined using a model of heat transfer in fibrous materials. In the process, their basic technical characteristics were taken into account (density, average diameter of the fibers, and operating temperature).During the development of the model heat transfer in a unit cell in the form of a parallelepiped, along one diagonal of which a fiber is placed, touching neighboring fibers at its vertices, were examined. It was assumed that the heat flux passing through the cell is perpendicular to one side of the parallelepiped, the content of the solid phase in the cell is equal to its average concentration, the temperature on the bottom and top surfaces of the unit cell is constant and heat is not transferred
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