TEMPO Project Report - Integrated Innovations In Enerpipe Network
To implement and operate an optimally functioning district heating network, coordination and a certain amount of heat storage capacity in each home are very beneficial.
As a consequence, a district heating network with higher-level control and decentralized buffers in every participating house was built in a development area in rural Windsbach, a town in south-eastern Germany. Decentralized buffers allow for a certain amount of thermal energy to be stored inside each house. Thus, demand peaks may be capped (“peak-shaving”). Consequently, the district heating pipes may be designed with smaller diameter. This allows reduced installation costs as well as minimized transfer heat losses.
The higher-level controller is able to manipulate the amount of energy stored (within comfort boundaries), further improving these effects.
Several assumptions had to be made for the district heating (DH) network in order to determine the adequate size of the district heating piping, the heat generators and the central pumps that transport the hot water to each house:
- The average energy consumption of single-family homes averaged over the day is about 10 kW or slightly more (depending on the building size), and about 40 kW for multi-family homes. Consumption peaks (e.g. for domestic hot water generation) are being attenuated by the buffer tank.
- Maximum supply temperature (in winter) is 80°C, return temperature will be significantly below 50°C. Together with the calculated maximum required heat power, this allows the layout of the network’s central pumps and pipe diameters.
Overall, approx. 3000m of pre-insulated plastic pipes have been installed. By the end of 2021, about 70 to 80 homes will be connected to the heating network.
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