Revitalization of the hot water network in the area of the city of Zagreb, Zagreb
HEP Toplinarstvo d.o.o.
The project “Revitalization of the hot water network in the area of the city of Zagreb” will be carried out during three years in the period outside the heating season, and almost a third of the hot water network of the city (68.5 out of a total of 227.3 kilometres) will be replaced. With this revitalization, the supply to 100,000 households will be improved and heat losses caused by outdated equipment will be reduced.
More than half of the existing hot water network of the central heating system of the city of Zagreb was built between 1962 and 1995 using the now obsolete technology of classical laying of steel pipes in a concrete channel. Hot water pipes laid in this way are subject to external influences such as a high level of underground water, possible pipe leaks and penetration of rainwater into concrete channels, which favours the deterioration of hot water pipes and the occurrence of corrosion and leads to increased heat losses, an increased number of pipe breaks and interruptions in the supply of thermal energy.
With the revitalization project, the hot water network will be revitalized with a more modern technology of ductless laying of pre-insulated pipes, which will increase the reliability and safety of the central heating system of the city of Zagreb. Thus, it will reduce heat losses by approximately 28 percent, operating water replenishment losses by approximately 47 percent, and the number of emergency interventions on reconstructed sections of the hot water pipe by 90 percent. Also, the reduction of thermal energy losses will result in a reduction in the production of thermal energy and, consequently, in the reduction of emissions of pollutants into the environment. It is predicted that two years after the implementation of the project, CO2 emissions will be reduced by 11,104 tons compared to the situation before the revitalization.
The project is co-financed by the European Union.