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Subproject 10

Regional case studies

Novelty of the solution of the subproject 

Innovations and technology developments (SP 4–9) are applied for the first time to specific Swiss case studies. The novelty lies in the systemic interdisciplinary approach. The summary of KPIs and main findings from seven case studies is novel and provides a valuable basis for further replications.

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Zurich

  • Evaluate decentralized, building-level swarm-storage potential for mitigation of DHC demand peaks for a specified area using a bottom-up modelling approach.

  • Identification of incentives in planning and operation through altered tarif schemes.

  • Identification of STES potential in Zurich considering different STES technologies (UTES, PTES, BILS) and size distributions along with its network integration.

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St. Gallen

  • Perform multi-criteria GIS analysis to identify STES potential and possible locations for suitable STES technologies in St.Gallen.

  • Specifically assess different heat integration options, considering decentralized wood-fired CHP plant or extension of existing waste incineration plant

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Linth/Ausserschwyz

  • Possibilities of STES for the connection of Energie Ausserschwyz with KVA Linth.

  • Potential for STES to be integrated in existing structures (e.g., PTES in gravel pit, BILS, CTES).

  • Decentralized placement of STES to replace peak boilers and relieve existing and minimize the cost of new connecting pipes

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Schaffhausen

  • Making use of the constant energy source of a large data center.

  • Potential of the nearby gravel pit as PTES, modelling of heat losses, operation and integration

  • Integration and loading/unloading concepts with large scale HP’s using waste heat of ~40 °C.

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Bern - Tunnel reutilization

  • Reutilization of an existing tunnel using CTES technology

  • Development and evaluation of concepts for an internal partitioning of the CTES. Simulation-based analysis on: (i) optimization of storage temperature, (ii) integration to the grid, and (iii) control strategies for charging/discharging the storage 

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Bern- PTES in Wankdorf

  • Realization of a multi-purpose PTES in Wankdorf with a cover used for solar energy production and/or parking area. 

  • Estimated potential: 330’000 m3 storage volume, 13 GWh storage capacity.  

  • Techno-economic feasibility focusing on storage temperature, heat losses, thermal insulation and lining materials, solar energy integration. 

 

Lucerne

  • Spatial multi-criteria analysis for STES in the strategic energy planning of ewl in the greater Lucerne area: application of SP2 toolbox

  • Analysis of innovative storage solutions for the new HSLU Campus Horw: Distributed hybrid storage solutions (SP9) and re-used cavern TES (SP4) and their integration to the thermal grid of ewl and the microgrid of HSLU. 

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Zug

  • STES assessment for the densely populated area at Tech Cluster Zug with a focus on thermochemical storage (SP8) and distributed storage options (SP9) and their integration to the district heating and cooling network. 

  • Systemic optimization with a strong focus on flexible sector coupling. 

Objectives of the subproject 

The case studies serve as a practical exploration to pinpoint both technical and non-technicalchallenges that could emerge during the deployment of STES technologies in CH. They act as aspringboard for initiating pilot and demonstration projects, offering invaluable insights into potentialhurdles. Through these studies, we aim to devise effective strategies to navigate and surmount thechallenges encountered, thereby accelerating the successful implementation of STES technologies.

Scientific

  • Definition, analysis and comparison of a common set of KPIs for innovative STES solutions for various regional boundary conditions. 

  • Provide a comprehensive comparison with guidelines for sizing and integration of different
    STES technologies in the Swiss context.

Economic and societal

  • The cases studies are carried out in cooperation with SP3, specifically treating economic and societal issues.

Environmental

  • Enhanced integration of renewables through STES, utilizing surplus summer energy to
    supplant fossil-fuel-driven peak demands in winter. 

  • Depending on the case and technology, specific environmental aspects are dealt with. e.g. the renaturation of PTES covers or the influence of BILS on lake ecology.

Technological

  • Technological goals are addressed in close cooperation with the technology developments in SP4-SP9. The case studies aim to identify and solve case-specific challenges for the new
    technologies.

Research partners

OST-SPF, OST-IBU, HSLU-CCMS, HSLU-CCTES, HSLU-TEVT, ZHAW-IBP, UNIGE-GG

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