CASE: 103 HOUSEHOLDS READY TO CONVERT TO 4GDH This case represents a typical medium-sized (103 consumers) district heating system located in Austria. To test the simulation requirements given by 4GDH systems, we adopted the Original Case (see Figure 3): In the so-called Future Case, we integrated a power-to-heat unit and a thermal storage, a decentralized top unit that operates with high gradients. Furthermore, we integrated several prosumers with small-scale solar units and we introduced a temperature step at the base unit to imitate a temperature wave.
4.000m 3 storage volume 1MW transfer capacity P2H Unit
Figure 3: Case A: Medium-sized district heating network (adopted to test future simulation requirements).
Figure 4 shows the temperature wave propagation through the network, and Figure 5 shows the pressure at the base unit for the Original Case as well as for the Future Case. It can be seen that the maximum pressure at the base unit in the Future Case is lower because of the top unit which operates during the peak load. The significant increase of the physical and engineering systems complexity has little impact on the simulation performance. The computation time on a standard laptop for 24 hours is about 8 minutes. According to these results, it can be concluded that the framework is suitable for simulating 4GDH systems.
Figure 4: Temperature wave propagation
Figure 5: Pressure at the Base unit for theBase Case (black, left y-axis) as well as the Future Case (black dashed, left y-axis) and the heat production at the Top Unit in the FutureCcase (orange, right y-axis).
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