7th International Conference on Smart Energy Systems21-22 September 2021
#SESAAU2021
Multi-purpose Pit Thermal Energy Storage in Combination with Heat Pumps
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Funded by the European Union’sHorizon 2020 Research and Innovation Programme under Grant Agreement no. 846463
Morten Vang Bobach – MSc Mechanical Engineering
Product Manager
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
Morten Vang Bobach – MSc Mechanical Engineering
Product Manager