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The Assessment of Seasonal Thermal Energy Storage: Status & Challenges

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Abstract

Comparison of life cycle assessment and cost of seasonal thermal energy storage technologies at single-family house scale in Switzerland (preliminary results in Jan 2020).
WIR SCHAFFEN WISSEN HEUTE FÜR MORGEN
The Assessment of Seasonal Thermal Energy
Storage: Status & Challenges
Xiaojin Zhang
Laboratory of Energy Systems Analysis, PSI
Swiss Symposium Thermal Energy Storage
Jan 24 2020, HSLU, Luzern
Seasonal Thermal Energy Storage – Why?
Page 2
Source: Infras; Prognos; TEP Energy;, “Analyse des schweizerischen Energieverbrauchs 2000 -2016 nach Verwendungszwecken,” 2017.
National energy consumption by usage in Switzerland, 2016
40% of energy consumption:
space heating & hot water
Seasonal Thermal Energy Storage – Why?
Page 3
Source: Infras; Prognos; TEP Energy;, “Analyse des schweizerischen Energieverbrauchs 2000 -2016 nach Verwendungszwecken,” 2017.
National energy consumption by usage & sector in Switzerland, 2016
Seasonal Thermal Energy Storage – Why?
Page 4
Source: Infras; Prognos; TEP Energy;, “Analyse des schweizerischen Energieverbrauchs 2000 -2016 nach Verwendungszwecken,” 2017.
Energy carriers used in Swiss household heating, 2016
Assessment of Seasonal Thermal Energy Storage
Page 5
Single-family House
(SFH)
Thermal Energy Storage Options
Solar Collector
Auxiliary Heating
Boilers Heat pumps
Seasonal Thermal
Energy Storages
Alternative
Heat Supplies
1 MJ of Heat 1 MJ of Heat
Gas
Wood
Air-water
Borehole
Surface water tank
Borehole storage
Ice storage +
+
Methodology
Page 6
Technical System Single Family House
-built after 2010
-space heating and hot water
demand of ~11,000 kWh per year
Life Cycle Assessment (LCA) Life Cycle Cost (LCC)
https://lu.heizvergleich.ch
Other Heating Technologies
Seasonal Thermal Energy Storages
Basis for comparison:
-1 MJ heat supply
-Single Family House
(60 kWh/m2/year)
-Solar Coverage Ratio
(SCR)
Life Cycle GHG Emissions (LCE)
Page 7
-Heat pump powered by average Swiss grid supply
(consumption-based)
-Error bars represent heat pump powered by average
German grid supply
(consumption-based)
Seasonal Thermal Energy Storages
Other Heating Technologies
LCC & LCE: Seasonal Thermal Energy Storage
Page 8
LCC & LCE: Seasonal Thermal Energy Storage
vs. Heating Supply Technologies
Page 9
Cost of heating technologies are estimated based on https://lu.heizvergleich.ch
LCC & LCE: Seasonal Thermal Energy Storage
vs. Heating Supply Technologies
Page 10
Cost of heating technologies are estimated based on https://lu.heizvergleich.ch & investment costs for 5 kWp systems
CH DE future fossil fuel cost?
future electricity cost?
Electricity Grid Mix in Germany, 2019
Page 11
Source: https://www.agora-energiewende.de/service/agorameter/chart/power_generation/23.01.2019/23.01.2020/
Price Development Fuels & Electricity
Page 12
Source: https://www.propellets.ch/heizen-mit-pellets/zahlen-und-fakten/pelletpreis.html
Price Development Natural Gas
Page 13
Source: https://www.energie360.ch/de/energie-360/wissen/erdgas-biogas/gaspreise/
Status:
LCE:
vs. fossil fuel heating: much lower LCE
vs. heat pump: dependent on dynamic electricity mix
LCC:
Still more expensive than other heating technologies
Challenges:
Clear definition of "seasonal" is needed
Has to be combined with short-term storage
Dynamic electricity grid mix and fuel cost development
Inter-linkages between heat, electricity and fuel
Take-home Message
Page 14
Other reference systems
PV + heat pump + thermal energy storage
PV + electricity storage + heat pump
boiler + synthetic fuels
Other STES technologies
near-surface water tank
Other system scales: multi-family house, (district)
Outlook
Page 15
Thank you! Questions?
Acknowledgement
-HSLU
Benjamin Schröteler
Helene Sperle
Marco Meier
Matthias Berger
Jörg Worlitschek
-PSI
Christian Bauer
Funding
WP 5.1, SCCER Hae,
Innosuisse
Contact
Page 16
xiaojin.zhang@psi.ch
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