| Abstract [eng] |
The paper analyses the current situation of UAB "Jonavos šilumos tinklai", which shows that due to the implementation of thermal energy saving measures, thermal energy consumers in Jonava have significantly reduced their consumption of thermal energy. This makes it difficult to reduce the relative heat losses in the heat supply network, and also causes problems when the heat recovery water flows are lower than the design flow. The paper analyses, based on the experience of western countries, a possible measure to reduce relative heat losses by switching to low–temperature heat supply, i.e. by reducing the temperature schedule of the heating water. To this end, modelling of the operation of real consumers and the heat supply network in the urban area and a techno–economic assessment of such possible upgrades to different temperature schedules of the heating water supply were carried out. It should be stressed that if we consider only the investments that would be made in upgrading the CHP network, the payback period would be around 19–30 years, depending on the prospective temperature schedule. Investments at the consumers' end, which would be needed to adapt to low–temperature heat supply, have not been assessed here. It is for this reason that it can be concluded that low–temperature heat supply in existing systems would lead to an excessive investment requirement when upgrading them. Therefore, the paper concludes that the optimum conditions for the use of low–temperature heat supply would be in new buildings that are designed for the operating conditions of such heating systems. |
