Thermal Energy Storage Technologies & Applications...thermal energy storage The chosen thermal energy storage technology has to match the actual application Thermal energy storages
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Bavarian Center for Applied Energy Research
- ZAE Bayern -
Andreas Hauer
Thermal Energy Storage –Technologies & Applications
Energy Storage –
Basic Definitions
Definitions „Energy Storage“
What is energy storage?
An energy storage system can take up energy and deliver it at a later point in time. The storage process itself consists of three stages: The charging, the storage and thedischarging. After the discharging step the storage can be charged again.
Charging Storage Discharging
HeatInput
ChargingProcess
Storage DischargingProcess
User
Ambience
Energy is supplied as heat,
is stored in some way,
is supplied as heat to a user.
Thermal Energy Storage Process
HeatOutput
T
S
Ta
T
S
Ta
T
S
Ta
T
S
Ta
Heat from heat source
Heat to storage
Heat to user Heat to ambience
Energy is conserved Exergy is „consumed“!
Conversion of heat in a storage process
Q = T * S
T
S
T
S
T
S
Ta Ta TaTa
T
SHeat from heat source
Heat to storage
Heat to user Heat to ambience
Temperature (quality of energy stored) can rise!
Conversion of heat in a storage process
Energy is conserved Exergy is „consumed“!
Motivation for the Storage of
Thermal Energy
Final Energy Demand (Germany)
Final Energy Demand (Germany)
The Role of Thermal Energy Storage
IEA Energy Storage Technology Roadmap
Roadmap Key Findings
• Storage can support energy system decarbonisation
• Some technologies already competitive, others (particularly electricity storage) still too expensive
• Additional R&D still needed to reduce costs
• Optimal role for storage varies widely across regions
• Power markets are ill-equipped to compensate storage for suite of services they can provide
• Thermal energy storage systems could make better use of wasted heat
The Role of Thermal Energy Storage
The Power of Transformation - Wind, Sun and the Economics of Flexible Power Systems
• DSI (in particular distributed thermal storage) showed significant promise, as suggested by its superior cost-benefit performance compared to other flexibility options. However, a degree of uncertainty exists regarding its full potential in real-life applications.
• Cost-benefit profiles …..
• The cost-effectiveness of distributed thermal storage points to the importance of coupling the electricity sector with other sectors of the energy system to achieve cost-effective VRE integration.
• In addition to coupling the heat and electricity…
Thermal Energy Storagein Economic Suitable Application
Conclusions:
Thermal Energy Storage
A number of different applications for the impovement of energyefficiency or the integration of renwable energy can be approached bythermal energy storage
The chosen thermal energy storage technology has to matchthe actual application
Thermal energy storages can help integrating renewableelectricity, in particular for cooling applications!
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