7 th International Conference on Smart Energy Systems 21-22 September 2021 #SESAAU2021 Multi-purpose Pit Thermal Energy Storage in Combination with Heat Pumps Powered by Funded by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement no. 846463 Morten Vang Bobach – MSc Mechanical Engineering Product Manager [email protected]
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7th International Conference on Smart Energy Systems21-22 September 2021
#SESAAU2021
Multi-purpose Pit Thermal Energy Storage in Combination with Heat Pumps
Powered by
Funded by the European Union’sHorizon 2020 Research and Innovation Programme under Grant Agreement no. 846463
7th International Conference on Smart Energy Systems21-22 September 2021
2
PTES, Pit Thermal Energy Storage Low cost storing energy in a green future
• A flexible energy system that will enable the conversion from conventional fossil fuel energy to fluctuating renewable energy sources requires large scale energy storage.
• The PTES technology is a low-cost energy storage for thermal energy up 90°C. Energy is simply stored in pure water.
• PTES enables storing of excess energy for later use in district heating networks resulting in increased flexibility and efficiency of the heat production. This includes:
• excess heat from solar heating plants, power plants or industrial processes
• excess electricity produced by wind or PV stored as heat
• Collecting waste heat/power and using it for district heating later helps lower energy loss and reduces our carbon footprint.
7th International Conference on Smart Energy Systems21-22 September 2021
3
PTES, Pit Thermal Energy Storage The next generation of storing energy in a green future
7th International Conference on Smart Energy Systems21-22 September 2021
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Combining PTES and heat pump
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
Heat pump / ORC
Compressor mode
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
7th International Conference on Smart Energy Systems21-22 September 2021
5
Reverse the proces – PTES as electricity storage
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
Heat pump / ORC
Expander mode
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
7th International Conference on Smart Energy Systems21-22 September 2021
6
Efficiency - Charging
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
(Energy Units from theoretical Lorentz efficiency)
1(electricity)
8(heat)
Heat pump / ORC
Compressor mode
9(heat)
7th International Conference on Smart Energy Systems21-22 September 2021
7
Efficiency - Discharging
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
Heat pump / ORC
Expander mode
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
1(electricity)
8(heat)
9(heat)
(Energy Units from theoretical Lorentz efficiency)
7th International Conference on Smart Energy Systems21-22 September 2021
8
Round trip efficiency – power to power
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
(Energy Units from theoretical Lorentz efficiency)
1(electricity)
8(heat)
Heat pump / ORC
Compressor mode
9(heat)
Wind turbinePhotovoltaic solar collectors
PTES
Solar thermal
collectors
Heat pump / ORC
Expander mode
DH Consumers
PTES
Industry
Low temperature heat source
- Exces heat from industry
- Cooling processes
- Flue gas condensation
- Solar thermal collectors
- …
50°C 85°C
85°C
50°C
50°C
10°C
10°C
10°C
50°C
50°C 85°C
50°C85°C
85/50°C
50/10°C
1(electricity)
8(heat)
9(heat)
(Energy Units from theoretical Lorentz efficiency)
Ideal:
η = 9/1 = 9
Realistic?:
η = 9*0.7 = 6.3
Charging
Ideal:
η = 1/9 = 0.11
Realistic?:
η = 0.11*0.7 = 0.08
Discharging
Ideal:
η = 9*1/9 = 1
Realistic?:
η = 6.3*0.08 = 0.50
Round trip power to power
THANK YOU FOR YOUR ATTENTION
Multi-purpose Pit Thermal Energy Storage in Combination withHeat Pumps