In WP2 of the TEMPO project an innovative energy supply concept for low-temperature district heating (DH) networks in new urban areas was developed. The concept was originally foreseen for demonstration by Vattenfall in a new residential area in northern Germany. In a market competition the local area developer however finally opted for a competitor with a standard supply concept with lower investment cost. The project partners involved into the work still think that the developed innovative concept is worthwhile and can be a blueprint for future developments.

The developed energy supply concept described in the deliverable generates heat, cold and electricity with a 100 % share of renewables and a primary energy factor of zero. The main energy producers are a ground-coupled heat pump (HP) connected to a geothermal well or aquifer system and a bio-gas driven combined heat and power (CHP) unit. In the design, the heat pump produces about one-third of the total heat demand of the DH network. The CHP unit produces two-third of the total heat demand as well as electricity for the heat pump, other auxiliary electricity consumers in the plant and additional surplus electricity. The geothermal system allows an optional cold supply of the consumers by a highly efficient direct cooling, i.e. without separate cooling machines.

District heating (DH) networks in new housing developments in general suffer from a low energy density and commonly relatively high thermal distribution losses due to energy efficient consumer buildings. To address this an innovative four-pipe low-temperature heat and cold distribution concept is considered in the supply concept. For heating DH distribution temperatures of 65/25 °C (supply/return) are designed, for cooling 14/22 °C.

According to calculations, the developed overall concept reduces the thermal losses of the DH network by 30 % and the primary energy consumption and greenhouse gas emissions of the entire supply area by 64 % and 100 %, respectively, compared to a standard DH network.

D2.1 is a confidential deliverable in the TEMPO project. However, we will be happy to answer your questions if you are interested in similar solutions.
Please contact: Thomas Schmidt (Solites, schmidt@solites.de)