BIG Solar Graz: Solar district heating in the city, 450,000 m² for 20% solar fraction Results of a techno-economic feasibility study

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1 BIG Solar Graz: Solar district heating in the city, 450,000 m² for 20% solar fraction Results of a techno-economic feasibility study Sept. 26 th 2017

2 Solar Heating Solar Cooling Solar Process Heat Solar District Heating 25 YEARS OF EXPERIENCE IN LARGE SOLAR THERMAL SYSTEMS 220 PLANTS IN 20 COUNTRIES

3 R&D activities of SOLID 16 research projects (3 international & 13 national) > 50 different partners Special focus on collector performance, seasonal heat storage, absorption heat pumps IEA SHC Task 55 Title: Towards the integration of large SHC systems into DHC networks Exchange platform for current SDH and SDC projects Duration: September 2016 August 2020 Contact for joining IEA SHC TASK 55: Operating Agent, Sabine Putz, More information:

4 SOLIDs experience in solar district heating in Graz Development from Contracting Open areas Field test

5 5 BIG Solar Graz [m²] [Million m³] [MW] 1. Why do we need solar energy? a seasonal pit storage? absorption heat pumps? 2. Dimensioning Solar field Storage Size Heat pumps capacity 3. Sensitivity Analysis + Collector Eff. + Heat Pump Eff. + DH Temperatures

6 X Why solar energy? Actual situation: Peak load: 530 MW DH demand: GWh/a 86 % provided by CHP (gas) Future situation: Delivery contract will end by 2020 Approx. 400 MW necessary Sustainable reliable solution 2020 Quelle: geoland.at Quelle: basemap.at 6

7 Shares of yearly supply [%] Why solar energy? PLAN for future of DH in Graz Renwable share [%] 7 Condition today Scenario for DH supply in Greater Graz from 2030 onwards Big Solar Graz Industrial waste heat Heatpumps 2030 Mellach generation plant (CHP) solar biomass Sappi (industrial waste heat) heat plant Graz waste heat Helios renewable share other fossil heat pump BigSolarGraz (without driving heat) Source: Grazer Umweltamt & Energie Agentur, Prutsch, Götzhaber, Papousek; Vortrag bei Fernwärmetagen in Velden,

8 8 Why big seasonal storage? Monthly demand Energy share > 85 C Energy share > 85 C Flow temperature Return temperature Winter demand Summer demand

9 9 Why heat pumps? District heating network from the 60ies with high temperatures: flow temperatures -> 115 C return -> 57 C Source: Henrik Lund, 4th Generation District Heating (4GDH)

10 10 Why heat pumps? Storage temperatures over the year Storage top Storage middle Storage bottom Without heat pump With heat pump

11 11 Dimensioning BIG Solar Graz Simulation Variationsrechnung Dimensionierung Zusammenhang Kollektorfläche zu Speichervolumina => Wärmegestehungskosten m² m³

12 12 Specifications of Optimal Solution losses Solar coverage: approx. 20 % Total capital expenditures: approx. 200 Mio. EUR

13 Heat production / load / loss / [MWh/month] 13 Simulated Monthly Generation Shares 450,000 m 2 collectors + 1,800,000 m 3 pit heat storage MW AHP Heat load (w/o summer) Heat losses from pit HP driving heat Solar heat via HP Solar heat - direct Ind. waste heat J F M A M J J A S O N D Month in 2 nd simulation year

14 Required Space Airport Solar Motorway junction Comparison to other infrastructure areas in Graz Big Solar concept ~ 100 ha Required solar system area < 0,8 % of the city area Airport Graz ~ 300 ha Motorw. junc. Graz West ~ 40 ha Generation plant Mellach ~ 110 ha Needed space for fast growing biomass for same energy ouput factor of 30 Conventional biomass floor space requirement for same energy amount factor of 55 14

15 Solar yield -10%.. Systemertrag.. +10% increase decrease Relative change in solar yield 15 Sensitivity Analysis Sensitivity analysis Zoom of all relatively comparable parameters Temperatures of DH Collector parameters Heat pump parameters Relative parameter change Parameter change -10%.. Parameteränderung % decrease increase

16 Relative change of solar yield 16 Sensitivity - Network Temperature Sensitivity analysis network temperatures Example: Reduction return 57 C 55 C Parameter change [K] increase in solar yield: 2.8 % MWh/year increase in profit (at 35 /MWh): /year 4th Generation, return flow 47 C increase in profit (at 35 /MWh): ~ 1 Mio /year Further increase of renewable share!

17 18 Current Steps According to Utility Acquisition of land Further development of the system concept: Strategy for operation and control Safety aspects Preparation of permissions and administrative procedures Targeted date for completion of approving: Utility presented this summer to public 2nd Quarter 2018

18 19 Summary Economic competitiveness (despite high network temperatures) geoland.at System solution for available heat at anytime Security of supply Long-term price stability refinancing costs are projectable, independent from the development of prices of fossil energy sources

19 Future solar-city Graz Unterstützt durch: For further information visit: Erneuerbare Energien , Zeitschrift für nachhaltige Energiezukunft, AEE Intec Solarwärme neu gedacht - Fernwärme für Europas Städte Erneuerbare Energien BIG Solar Graz: m² Solarkollektoren für 20 % Solaranteil bei Grazer Fernwärme City of Graz Green Future of District Heating in Graz: Patrick REITER Mail: p.reiter@solid.at S.O.L.I.D. Gesellschaft für Solarinstallation und Design mbh Puchstraße 85, 8020 Graz, Austria 20