Методика оценки последствий перехода на закрытую схему горячего водоснабжения в системах централизованного теплоснабжения

Abstract

As of 1 January 2022, the transition to a closed-circuit hot-water supply in district heating systems will begin in Russia. This work proposes a methodology for assessing the consequences of this transition. The procedure is as follows: determining specific operational consumption of district water for hot wa-ter supply with manual direct water intake when the outside temperature changes; developing the re-quired mode of closed hot-water supply; analysis of the practically possible mode of manual consump-tion in the heat supply system; determining the operational specific consumption of hot-water supply in manual hot water systems with direct water intake, including the characteristics of the heat supply source; calculating the flow rate of direct water for water circulation in manual hot water supply sys-tems; analysing the hydraulic regime before and after the transition to a closed circuit; offering recom-mendations. The method for assessing the consequences associated with the transition to a closed-circuit hot-water supply in district heating systems showed that the amount of make-up water consump-tion from a heat source is affected by a change in the actual consumption of hot-water supply and the temperature of cold and hot water. Based on the research results, it can be concluded that there is no technical possibility of an overall transition to a closed circuit. To prepare technical reports and perfor-mance charts, it is recommended to use the actual values of heat consumption for the hydraulic calcu-lations; to use the metered values and consider a significant number of manual hot-water supply sys-tems in calculating the hot-water supply consumption standard; to include the loss of heat energy on heating towel rails, domestic losses of building services systems under a four-pipe heat supply system in the distribution pricing.