UPDATED HEAT BALANCE OF SUPPLIED HEAT ENERGY BY THE DISTRICT HEATING SYSTEM

District heating systems are significant energy consumers in Ukraine and globally. The current regulatory documents in Ukraine that define the methodology for calculating the heat balance of a district heating system and the value of standard heat losses do not take into account some hidden heat losses that affect the prospects for economic growth of heat supply companies, the efficient allocation of investments and do not contribute to the transparent formation of heat tariffs. The paper proposes a new approach to calculating the heat balance of the released heat energy from the source (co-generation unit, boiler) in district heating systems for closed and open water heating networks, including standard heat losses in water heating networks due to thermal insulation of pipelines, excess heat losses in water heating networks due to thermal insulation of main pipelines, normative heat losses in water heating networks and district heating systems with network water leaks, energy losses for heating, energy losses during hot water supply, realized thermal energy from hot water supply system, and additionally — heat loss in residential buildings, in public premises, in hot water supply systems. The proposed approach also differs in that, according to the heat balance, the heat energy released after water heating networks is lost in the hot water supply system of a residential building, and its value is calculated experimentally by the ratio of the sold heat energy from the taps of the hot water supply system to the total sold heat energy in the heating and ventilation system of the same residential building, averaged over the heating period per month. The authors provide recommendations for calculating all components of heat losses of the proposed heat balance and present their assessment for modern district heating systems. Bibl. 21, Fig. 4, Tab. 2.