The Application of Hybrid Heat Insulation in Heat Supply Systems: Methods of Technical and Economic Substantiation

Abstract

Heat supply systems are a crucial element of the utility system in Russian cities and towns. High system breakdown rates are largely a function of pipeline material, quality of installation, and the parameters of heat insulation that prevent heat loss and metal corrosion. Breakdown of heat supply pipelines imposes additional repair costs, jeopardizes the safety of people around the accident site, and causes discomfort in buildings that use thermal energy. Aim. This study evaluates the possibility of using multilayer heat insulation in heat supply systems. Results. This study analyzes the possibility of using multilayer (hybrid) heat insulation in which each layer performs a specific function: prevents metal corrosion, dampness penetration, or provides heat protection. Mass implementation of such insulation requires an economic indicator-based assessment of different types of heat insulation (mineral wool, polyurethane foam, hybrid) with a specific thickness of the protective layer in each case determined by regulatory requirements depending on type-specific thermal properties. It should be noted that mineral wool and polyurethane foam insulation have a limited area of application. The former is non-durable and loses its thermal properties when wet. The latter cannot be used in pipelines where the temperature exceeds 150°С, i. e., temperature that is set when the heating system is designed. Therefore, the use of hybrid heat insulation is advantageous in terms of both thermal efficiency and economic indicators (the cost of the material and installation, payback periods).