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| Main Authors: | , , , |
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| Format: | Recurso digital |
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Zenodo
2025
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| Online Access: | https://doi.org/10.5281/zenodo.19386486 |
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Table of Contents:
- <p>According to the Energy Strategy 2050+, the share of district heating (DH) in Switzerland’s heat supply<br>is set to rise sharply to around 30 %. An increasingly popular type of district heating (DH) network is<br>the anergy network, which distributes energy from a low-temperature source to decentralized heat pumps<br>installed in buildings. Many low-temperature energy sources available in Switzerland have limitations, either<br>in their power output (e.g., waste heat from sewage treatment plants) or in their availability during cold<br>winter days, if at all (e.g., solar thermal energy). Due to the high amount of energy released (or absorbed)<br>during the liquid/solid phase transition of water, ice storage are suitable for storing large amounts of energy at<br>temperatures near 0 °C. For this reason, ice storages are being used in buildings as an energy source for heat<br>pumps in Switzerland, in so-called solar-ice systems. However, until now, there has been a lack of analysis<br>on integrating large-scale ice storage into district heating networks. In IceGrids, we explored the energetic<br>feasibility and economic viability of integrating ice storages into low-temperature district heating networks,<br>also known as 5th generation district heating and cooling (5GDHC). As a case study, our investigation focused<br>on the Jona energy network, which utilizes waste heat from a waste water treatment plant (WWTP) to supply<br>decentralized heat pumps, making the heat usable. Ice storage tanks can be easily integrated into 5GDHC<br>networks that employ an antifreeze heat transfer fluid, as the Jona network. However, freezing of the heat<br>exchanger on the sewage treatment plant side must be prevented by a partial re-circulation from the flow pipe.<br>Based on the results in this study, the following findings emmerge: In combination with power limited waste<br>heat sources, even small ice storage volumes are sufficient to bridge power peaks in winter. As a lot of surplus<br>waste heat is readily available for regenerating ice storage systems during the transition period, ice storage<br>systems can more than double the capacity of such sources. When combining ice storage tanks with scalable<br>seasonal heat sources (e.g.outdoor air or solarthermal energy), ice storage sizes of approx. 0.6m3/MWh are<br>required to enable year-round operation of the network at 0 °C.</p>