Evaluation of different pumped thermal energy storage systems

Koksharov, Josefine; Oliveira, Hannah Teles de; Dammel, Frank; Stephan, Peter

doi:10.52202/062738-0061

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, 1-butene [13,19] and propene [19] are also discussed as possible working fluids for the HP cycle and ORC for similar ORC-based PTES systems in the literature. In these PTES systems, the same working fluid is considered for both the HP cycle and the ORC.…”

Section: Results Of the Integrated Thermo-economic Design Of Orc-base...mentioning

confidence: 99%

“…A thermo‐economically optimal ORC‐based PTES system requires an optimal combination of processes and working fluids due to the strong interaction between processes and working fluids. However, so far, the thermo‐economic potential of ORC‐based PTES systems has only been analyzed for fixed, preselected working fluids, [ 19 ] leading to suboptimal solutions if the preselection fails.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

et al. 2022

View full text Add to dashboard Cite

Higher shares of renewable energy increase the need for electricity storage. A promising storage technology is Pumped‐Thermal Electricity Storage (PTES): PTES systems transform electricity into heat using a heat pump (HP) and reconvert the heat into electricity using a heat engine. Since both HPs and heat engines require working fluids, maximum performance requires the optimal combination of PTES process and working fluids. Herein this work, the thermo‐economic potential of an Organic Rankine Cycle (ORC)‐based PTES system is analyzed by simultaneously designing both the PTES process and the working fluids used in the HP and the ORC. To rigorously explore the molecular design space, the 1‐stage Continuous‐Molecular Targeting ‐ Computer‐Aided Molecular Design method is employed. Detailed models for costing and sizing of the equipment allow for a thermo‐economic design of the PTES. The computer‐aided molecular design formulation integrates the working fluids as degrees of freedom into the process optimization. For the investigated ORC‐based PTES system with an input power of 60 MW, the optimal process and working fluids minimize the specific investment cost to SIC = 929 € kWh out − 1 . The analysis of cost drivers shows that with decreasing compressor cost, the investigated ORC‐based PTES system can become a competitive storage technology.

show abstract

Section: Results Of the Integrated Thermo-economic Design Of Orc-base...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In contrast to the other components, the PEC of the throttle was negligible. A detailed explanation of the calculation of PECs can be found in [28]. An average value of EUR 550 m −3 [18] was used to determine the PEC for the two-zone storage tank.…”

Section: Equipment Costmentioning

confidence: 99%

Thermodynamic, Economic and Maturity Analysis of a Carnot Battery with a Two-Zone Water Thermal Energy Storage for Different Working Fluids

Koksharov,

Zendel,

Dammel

et al. 2024

Energies

View full text Add to dashboard Cite

The rising share of renewable energies leads to increased fluctuations in electrical power supply. One possibility to shift the surplus energy based on demand is a Carnot battery (CB). A CB uses a heat pump or resistance heater to convert and store thermal energy into electrical energy. Later, the stored thermal energy is converted back into electrical energy using a heat engine. This study investigates a CB with a two-zone tank for thermal energy storage. A transcritical process with CO2 is applied for charging, while discharging employs a transcritical process with CO2 and six refrigerants operating in a subcritical process. The transcritical process with CO2 and the four most promising subcritical processes are compared regarding round trip efficiency and levelized cost of electricity (LCOE) depending on the pinch points 5 K and 1 K in the heat exchangers. Additionally, the technology readiness level (TRL) is determined for these configurations. The results show round-trip efficiencies between 11.3% and 33.5% and LCOEs ranging from EUR 0.95 (kWh)−1 to EUR 2.09 (kWh)−1 for the considered concepts with TRLs of up to six.

show abstract

“…The PEC of the throttle was negligible compared to the other components. A detailed description for estimating PEC is available at [26]. For calculating the PEC of the two-zone storage tank, an average value of 550 e/m 3 [15] was applied.…”

Section: Equipment Costmentioning

confidence: 99%

Thermodynamic and Economic Analysis of a Carnot Battery with a Two Zone Water Tank as Thermal Energy Storage

Koksharov,

Klingelhofer,

Dammel

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

View full text Add to dashboard Cite

In the process of energy transition, the share of renewable energy sources is increasing. This leads to strong fluctuations in power generation. To balance supply and demand, energy storage is required. Carnot batteries could be a promising storage technology to solve this problem. These batteries convert electrical energy into thermal energy through an electrical resistance heater or a heat pump and stores this energy for a period of time. Later, the thermal energy is converted back into electrical energy through a heat engine. A Carnot battery with a two-zone tank and water as a storage medium was investigated. This type of storage allows storage temperatures above 100 • C under atmospheric conditions. The system studied here applies a storage temperature of 115 • C. Charging is realized with a CO 2 heat pump, while discharging uses a heat engine with an organic fluid. This Carnot battery was implemented and simulated in EBSILON R Professional. The supplied electrical power was 18 MW and the maximum outlet temperature was 150 • C. Derived from the day-ahead market [1], a charging and discharging time of 4 h was applied. To identify the most promising concept for practical applications, the round trip efficiency, levelized cost of electricity (LCOE), and technology readiness level (TRL) of the different Carnot battery configurations were compared. In addition, a simplified sensitivity analysis was performed to assess the influence of the uncertainties of the economic parameters on the LCOE. Furthermore, the change in the LCOE with a variation in the charging and discharging duration was investigated. The advantage of a CO 2 heat pump is that applications with high input power have already been implemented, which leads to an estimated TRL of at least 6. By contrast, heat pumps for temperatures above 100 • C utilizing screw or piston compressors are only available for lower power applications.

show abstract

Evaluation of different pumped thermal energy storage systems

Cited by 3 publications

References 0 publications

The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

Thermodynamic, Economic and Maturity Analysis of a Carnot Battery with a Two-Zone Water Thermal Energy Storage for Different Working Fluids

Thermodynamic and Economic Analysis of a Carnot Battery with a Two Zone Water Tank as Thermal Energy Storage

Contact Info

Product

Resources

About