The heat energy path to the user begins with the production of heat energy – in order to ensure this, there are two CHP (Combined Heat and Power) plants, a biomass boiler house and 11 autonomous gas boiler houses in Liepaja. The largest Liepaja heat power plant is located on Kaiju Street (Kaiju iela), and it works with chips, providing the largest part of the city with green heat energy. Together with the second CHP plant on Tukuma Street (Tukuma iela), the heat power plants cover the city’s territory from the Karosta Canal to the Southwest. In turn, the inhabitants of the distant urban areas receive heat energy produced in autonomous boiler houses.
Generated heat energy is transmitted to the city’s buildings through the heat pipelines. This heat energy pathway to the building is called the heat transfer and distribution system. Each building is supplied with two pipes – one for hot water from the boiler house of the company going to the building’s heating unit, and the second for cooled water flowing out of the building’s heating unit to the boiler house where the cycle starts again.
The infrastructure of the Liepaja heating network is about 100 km, including the main, distribution and internal district heating pipelines. During the operation of the company, already 90% of the heating network has been completely reconstructed; the remaining heating networks will be upgraded by 2020, so the townspeople can be sure that modernized heating networks will serve for several decades.
There is a heating unit in each building receiving central heating – it transforms the heat energy into the heating system of the building and water heating, as well as provides the accounting for the supplied heat.
When the heat energy reaches the house’s heating unit, its pathway decomposes – one heat exchanger ensures heat energy circulation in the radiator system by providing the building with heating, while the other heat exchanger function is to ensure that the cold water supplied to the building is heated with the help of heat, and that the hot water flows from the tap. To ensure consumers comfort and, when the tap is opened, stable availability of water at the required temperature, there is continuous hot water circulation in the home system and heating of this water.