Thermoeconomic design optimization of a thermo-electric energy storage system based on transcritical CO2 cycles

Morandin, Matteo; Mercangöz, Mehmet; Hemrle, Jaroslav; Maréchal, François; Favrat, Daniel

doi:10.1016/j.energy.2013.05.038

Cited by 103 publications

(53 citation statements)

References 24 publications

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“…Further exergetic losses result from nonideal compression and expansion processes. Figure 2 shows ideal and real Cascaded pressurized water multitank [29][30][31][32][33] www.advancedsciencenews.com www.entechnol.de compression and expansion processes for given pressure differences in enthalpy-entropy (hs)-diagrams. The ideal processes are operated between state 1 and 2s, the real processes are operated between the states 1 and 2, and the changes in specific enthalpy are Δh s for the ideal processes and Δh for the real processes.…”

Section: Thermodynamics Of Real Ptes Systemsmentioning

confidence: 99%

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

2019

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Within the thermal energy storage initiative, National Demonstrator for IseNtropic Energy (NADINE) storage, three projects are carried out focusing on thermal energy storage at different temperature levels. Thermal storage units are key components of Carnot batteries, which are based on the intermediate conversion of electric energy into heat. Pumped thermal energy storage (PTES) is an emerging Carnot battery concept variant for the flexible management of supply and demand of electricity, heat, and cold. A counterclockwise thermodynamic cycle operated by surplus electricity is used to charge a thermal storage, which delivers heat to operate a power cycle during discharge. The absence of geographic constraints, a theoretical roundtrip efficiency of 100%, and a small environmental footprint are promising features of PTES. PTES is also able to provide low‐cost backup capacity in case of shortages in available renewable energy. Various options are proposed for the technical implementation of PTES, using various combinations of engines, thermal storage units, and working fluids. The resulting systems differ in efficiency, costs, maturity, and complexity. Herein, a thermodynamic analysis of five different PTES variants is presented. The results should help to identify priorities in the further development of the PTES variants.

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Section: Thermodynamics Of Real Ptes Systemsmentioning

confidence: 99%

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

2019

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“…[31] presents research on the behavior of the round trip efficiency with changes in the temperature of the low-temperature hot storage tank. Different system configurations have been adopted for performance promotion, including work recovery expander, heat recuperator, intercooler and reheater, superheating before compression, and so on [19,33]. Different system configurations have been adopted for performance promotion, including work recovery expander, heat recuperator, intercooler and reheater, superheating before compression, and so on [19,33].…”

Section: Introductionmentioning

confidence: 99%

“…Ground heat storage is an alternative approach, which is relatively cheap and steady compared with conventional CAES and PHS [32]. [19]. A performance comparison among the aforementioned system configurations with optimized parameters is also given in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Ground heat storage is an alternative approach, which is relatively cheap and steady compared with conventional CAES and PHS [32]. Different system configurations have been adopted for performance promotion, including work recovery expander, heat recuperator, intercooler and reheater, superheating before compression, and so on [19,33]. A performance comparison among the aforementioned system configurations with optimized parameters is also given in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis of a novel energy storage system based on compressed CO₂fluid

Zhang

Wang

2017

Int. J. Energy Res.

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Summary Because of rapidly growing renewable power capacity, energy storage system is in urgent need to cope with the reliability and stability challenges. CO2 has already been selected as the working fluid, including thermo‐electrical energy storage or electrothermal energy storage systems and compressed CO2 energy storage (CCES) systems. In this paper, a CCES system based on Brayton cycle with hot water as the heat storage medium is proposed and analyzed. Thermodynamic model of the system is established for energy and exergy analysis. Sensitivity analysis is then conducted to reveal effects of different parameters on system performances and pursue optimization potential. At a typical transcritical operation condition, round trip efficiency is 60% with energy density of 2.6 kWh/m3. And for the typical supercritical operation condition, the round trip efficiency can reach 71% with energy density of 23 kWh/m3. High round trip efficiency and energy density, which is comparable with those of compressed air energy storage systems, thermo‐electrical energy storage (electrothermal energy storage) systems, and other CCES systems, lead to promising prospect of the proposed system. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Kim et al [16] proposed a novel isothermal ETES with transcritical CO 2 cycles, which shows higher roundtrip efficiency because of a lower back work ratio than in the isentropic case. Furthermore, the heat transfer of ETES plays an important role in the system performance [17]. Morandin [18,19] used pinch analysis tools to optimize various forms of transcritical CO 2 cycle based ETES.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis for Heat Transfer Optimization in Subcritical Electrothermal Energy Storage Systems

Zhang

Chen

et al. 2017

Energies

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Electrothermal energy storage (ETES) provides bulk electricity storage based on heat pump and heat engine technologies. A subcritical ETES is described in this paper. Based on the extremum principle of entransy dissipation, a geometry model is developed for heat transfer optimization for subcritical ETES. The exergy during the heat transfer process is deduced in terms of entropy production. The geometry model is validated by the extremum principle of entropy production. The theoretical analysis results show that the extremum principle of entransy dissipation is an effective criterion for the optimization, and the optimum heat transfer for different cases with the same mass flux or pressure has been discussed. The optimum heat transfer can be achieved by adjusting the mass flux and pressure of the working fluid. It also reveals that with the increase of mass flux, there is a minimum exergy in the range under consideration, and the exergy decreases with the increase of the pressure.

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Thermoeconomic design optimization of a thermo-electric energy storage system based on transcritical CO2 cycles

Cited by 103 publications

References 24 publications

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

Thermodynamic analysis of a novel energy storage system based on compressed CO₂fluid

Theoretical Analysis for Heat Transfer Optimization in Subcritical Electrothermal Energy Storage Systems

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Thermoeconomic design optimization of a thermo-electric energy storage system based on transcritical CO2 cycles

Cited by 103 publications

References 24 publications

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

Thermodynamic Analysis of High‐Temperature Carnot Battery Concepts

Thermodynamic analysis of a novel energy storage system based on compressed CO2fluid

Theoretical Analysis for Heat Transfer Optimization in Subcritical Electrothermal Energy Storage Systems

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Thermodynamic analysis of a novel energy storage system based on compressed CO₂fluid