Figure 2: Minimum supply temperature based on the critical flat compared to the daily average measured supply temperature for January 2022 and February 2022

The local DH operator in Viborg is shifting the heat genera- tion from natural gas to sustainable alternatives. Investments in large heat pumps represent the first step of the green transition plan, and lower supply temperatures will reduce heat generation costs due to lower electricity consumption. This will also benefit the end-users with lower heating bills. Acknowledgment The authors wish to thank the industrial partners Viborg Varme, Brunata A/S, and Grundfos A/S for collaborating with the Danish Energy Agency, and the EUDP program for funding the investigation.

The experimental findings in one of the buildings documented an excellent fit between the heating system’s measured dai- ly supply and return temperatures and the innovative control curve calculated using the data from the heat cost allocators and central district heating energy meters, as presented in Figure 2. Hence, existing buildings can be comfortably heated with low operating temperatures even without deep energy renovation, and during the test period, the supply temperature was never above 50 °C. Finally, the possibility of minimizing the operating temper- atures inside buildings will be reflected accordingly in the network. This is crucial for the overall economy of the system.

For further information please contact: Michele Tunzi, e-mail:

For further information please contact: Michele Tunzi:

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