The target city of the Upgrade DH project in Croatia is the city of Sisak. It is a middle sized city located in the Sisak – Moslavina County, southeast from the Croatian capital, Zagreb. The city is the administrative, cultural and historical center of the county, as well as one of Croatia’s biggest river ports and industrial cities. Total number of inhabitants is 47,768, as stated in the 2011 population census. Out of this number, 33,322 inhabitants live in the urban settlement.
The city Middelfart is located on Funen in the South-Region of Denmark, with around 15.246 inhabitants. Middelfart District Heating System is divided into two areas (Hessgade and Fynsgade), and are organizationally in charge of both Middelfart District Heating Area, but also Nørre Åby District Heating Area. Middelfart DH does not supply Nørre Åby, since they have their own local energy system, meaning Middelfart DH only supplies the city of Middelfart.
The city of Tuzla is placed in North-East part of the country, with around 170,000 inhabitants. The DH system is based on cogeneration (CHP) in Tuzla’s coal-based power plant (Tuzla TPP)operated by EPBiH power utility. Tuzla TPP is the supplier of heat to both Tuzla City (220 MWth) and Lukavac city (50 MWth). In the near future, the town of Živinice is planned to be supplied with a thermal power of 70 MWth.
The City of Kortrijk installed a pilot heatnet at Kortrijk Weide, as a nucleus for further extensions in the city. The feasibility to install a heatnet backbone from the waste incinerator at the outskirts of the city, along the River Leie, to the city center was researched. As many building projects are taking place along the river, this would create the opportunity to connect over 1,000 households.
Within a privately owned residential building a variety of technologies are implemented to reduce the energy consumption. Both a solar heating system and heat pump are connected to a boiler for the heating of water. This water is used as sanitary hot water. Space heating and cooling is achieved from fan coil units (FCUs); where hot or cold water circulates inside the convectors depending on the need. Finally, underfloor heating is established through a closed water pipe system, with a heat pump as heating source. The monitoring of the entire system takes place in one control unit.
In the small Slovenian town Kuzma a district heating network is established based on biomass burning. The investments were made by a private company, with the financial support of the national government, and the aim of reducing energy prices in the area. The biomass used is collected from local wood owners in the neighbourhood and converted into heat by two biomass boilers. In combination with a 10 m3 storage tank for peak load no additional heat source is required to supply heating to 58 houses and some other residential buildings.
The biomass heating plant and district heating grid in Güttenbach (Austria) was built in 1997. The boilers are fired with wood chips from local forests. There are two boilers installed, one biomass boiler with 1 MW capacity and one oil boiler for peak load and backup with 1.3 MW capacity. The village of Güttenbach has about 900 inhabitants and an area of 16 km2. The district heating grid has a length of 12 km with about 240 connected consumers. Each year there are 5,200 MWh heat sold to the consumers.
In the Achental Valley, a mountainous area located in the south of Germany, a heating grid has been installed driven by wood chip burning. The potential of using biomass in the region has been discovered during the European RES-Integration project. This project has studied renewable energy potential in various poor regions across Europe. It resulted in the installation of a biomass center in Achental in combination with a boiler house, connected to a heating grid for 500 consumers.