Comparison of Hydraulic Conditions in Primary Heating Networks

The paper deals with the comparison of hydraulic conditions in the primary heating network of a selected section of the district heating system. The calculated state was compared with the actual state before the renovation of buildings and the calculated state with the expected state after the renovation of buildings connected to the district heating system. The aim of the paper is to point out the disproportions that exist in the real heating networks of district heating systems through pressure diagrams, as the hydraulics of the outer part of the heating system are not given sufficient attention. By reconstructing the original primary heat distribution and replacing the circulation pump on a selected section, hydraulic stability of the system and savings in operating costs can be achieved