Abstract
Considered the possibility to improve the thermophysical properties of heat-insulating foam on the stage of production at the expense of obtaining the necessary qualitative and quantitative characteristics of porosity. It is shown that not only the value of porosity or volumetric weight of a material impact on the thermophysical properties of the material, but also the qualitative characteristics of porosity (the form and the size of the pores, the location of the pore volume of the material). Analyzed the existing dependence of the definition of the effective coefficient of thermal conductivity of the material, depending on the size and location of the pores in it and held their comparison with the earlier experimental data. Shows the drawbacks of the existing dependencies of determination of the effective coefficient of thermal conductivity of the material from the type of porosity (as for the porous material, and to disperse systems). It is recommended that such a structure the structure of a porous heat-insulating material, in which the coefficient of thermal conductivity will be minimal (with the same volumetric weight). Also defined are the most reliable of the dependence of the thermal conductivity of porosity to disperse systems backfill material and the necessity of their adjustment empirical coefficients.
Highlights
ВведениеНаиболее распространенным случаем использования пористых материалов в технической энергетике являет ся тепловая изоляция.
К таким материала относятся пенополистирольные материалы, газобетоны, некоторые высокоогнеупорные материалы, пеностекло, керамзит и т. д
Постановка проблемыПри подробном рассмотрении технологии получения любого из данных материалов можно сделать вывод, что существует зависимость между теплофизическими свойствами пористого материала и режимов его вспу чивания.
Summary
Наиболее распространенным случаем использования пористых материалов в технической энергетике являет ся тепловая изоляция. К таким материала относятся пенополистирольные материалы, газобетоны, некоторые высокоогнеупорные материалы, пеностекло, керамзит и т. д
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