Robert Sekret1, Arkadiusz Lipiński2
1Wydział Infrastruktury i Środowiska, Politechnika Częstochowska
2Specjalista z zakresu sieci i węzłów ciepłowniczych
Ciepłownictwo Ogrzewnictwo Wentylacja, 2026 (2), 3-8, DOI: https://doi.org/10.65545/COW.2026.02.01
Keywords: district heating system, improving energy efficiency, lowering temperatures, thermal modernization of buildings
Abstract
This paper presents an algorithm for calculating the reduced nominal supply and return temperatures of a district heating system. To achieve this, the thermal and flow excess of the district heating system, as well as the reduction in heat demand resulting from the thermal modernization of buildings, were considered. The research was conducted on a district heating system with an initial heat output of 327 MW. This system effectively reduced the supply temperature from 150°C to 118°C and the return temperature from 80°C to 60°C. This reduction in temperature allowed for a 19% improvement in the efficiency of transmitting and regulating the district heating network, without exceeding the nominal heat carrier flow rate. The algorithm was confirmed to be a useful tool for assessing the readiness of a given district heating system to implement fourth-generation district heating.
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