Параметры тепловой сети при пониженном температурном графике

Abstract

In the current Ukrainian economic situation, operation of heat supply systems is under low temperature of the heating-system water. The higher temperature chart of 95/70°С is inexpedient because of high cost of fuel. The experience of such countries as Denmark, Germany, Finland, Sweden, and Holland with developed centralized heat supply proves the necessity of priority equipment of local heat distribution and metering stations (HDMS) of the building with an automatic control system. After that, the technology with a reduced temperature chart should be applied. Therefore, the modernization of heat supply systems in Ukraine aimed to applying the reduced temperature chart will require the transition to closed independent heating systems, to qualitative and quantitative regulation, to automation of HDMS consumers. In the paper, the results of the numerical study of the constructive and operating parameters of influence of a heat supply network on the selection of the optimum temperature and the flow of the heating-system water in a district heating system (DHS) are considered. The significant influence of the heating characteristic k·F [ W / K] of a building on the parameters of the DHS has been determined, the actual values of k·F of some residential buildings have been determined according to field studies. The obtained actual data is lower than the calculated values of k·F, which requires increased temperature of the heat carrier in the supply pipeline. Reducing the temperature chart will require a reduction in energy consumption in residential and administrative buildings.