Performance analysis of a novel energy storage system based on liquid carbon dioxide

Wang, Mingkun; Zhao, Pan; Wu, Yi; Dai, Yiping

doi:10.1016/j.applthermaleng.2015.08.081

Cited by 132 publications

(26 citation statements)

References 11 publications

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“…The default values of the main parameters considered in this novel system are given in Table 4. Most values shown in Table 4 refer to documents 16,20,22,28,29,31 . It should be noted that since we adopt the assumption mentioned in Section 3 (namely, the heat transfer in HX 4 is imperfect), in most cases the minimum internal temperature approach (MITA) in HX 4 has to be higher than that in HX 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Round‐trip efficiency (abbreviated as RTE), which is generally defined as the ratio of the network output to the network input in one cycle, is commonly used in EES systems to evaluate system performance 20 . Assuming the working time of charge process is t charge and the working time of discharge process is t discharge , RTE can be defined as 21

RTE = \frac{W_{discharge} t_{discharge}}{W_{charge} t_{charge}} .

…”

Section: Thermodynamic Model Of This Novel Systemmentioning

confidence: 99%

“…Another novel EES system with CO 2 as the working fluid was proposed by Wang et al 20 This system was based on supercritical CO 2 cycle, liquid CO 2 storage, and TES technology. Wang et al highlighted that CO 2 was susceptible to liquefaction and the liquid CO 2 system had better safety and more flexibility, which could overcome the geographic restrictions met by PHS and CAES.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

et al. 2020

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Summary Research projects on new electrical energy storage (EES) systems are underway because of the role of EES in balancing the electric grid and smoothing out the instability of renewable energy. In this paper, a novel compressed carbon dioxide energy storage with low‐temperature thermal storage was proposed. Liquid CO2 storage was employed to increase the storage density of the system and avoid its dependence on geological formations. Low‐temperature thermal energy storage technology was utilized to recycle the heat of compression and reduce the challenges to system components. The system configuration was introduced in detail. Four evaluation criteria, the round trip efficiency (RTE), exergy efficiency (ηEx), thermal efficiency (ηTE), and energy density (ρE) were defined to show the system performance. Parametric analysis was carried out to examine the effects of some key parameters on system performance and the genetic algorithm was adopted for system optimization. The calculated results show that, for the novel EES under the basic working condition, its RTE is 41.4%, ηTE is 59.7%, ηEx is 45.4%, and ρE is 15 kWh m−3. The value of ρE increases with the increasing pump outlet pressure for a fixed value of pressure ratio, and the changes of RTE, ηTE, and the total exergy destruction of the system (ED,total) with pump outlet pressure are complicated for different values of pressure ratio. When both pressure ratio and pump outlet pressure are high, the values of RTE and ρE can be maximized whereas the value of ED,total can be minimized. Besides, no matter how pump outlet pressure and pressure ratio change, the exergy destruction of the system mainly come from compressors and regenerators, which accounts for about 50% of the total exergy destruction.

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Section: Resultsmentioning

confidence: 99%

RTE = \frac{W_{discharge} t_{discharge}}{W_{charge} t_{charge}} .

…”

Section: Thermodynamic Model Of This Novel Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

et al. 2020

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“…So as to pursue high energy density, liquid CO 2 is selected to be the storage phase in both low pressure and high pressure storage tanks [21]. So as to pursue high energy density, liquid CO 2 is selected to be the storage phase in both low pressure and high pressure storage tanks [21].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to Rankine cycle, CO 2 Brayton cycle is another representative power cycle used for compressed CO 2 energy storage (CCES). So as to pursue high energy density, liquid CO 2 is selected to be the storage phase in both low pressure and high pressure storage tanks [21]. So as to achieve higher round trip efficiency, transcritical cycle is employed with packed bed regenerator for efficient heat and cold storage [22].…”

Section: Introductionmentioning

confidence: 99%

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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Thermodynamic analysis of a novel fossil‐fuel–free energy storage system with a trans‐critical carbon dioxide cycle and heat pump

Hao

Liu

et al. 2020

Int J Energy Res

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This paper presents and analyzes a novel fossil-fuel-free trans-critical energy storage system that uses CO2 as the working fluid in a closed loop shuttled between two saline aquifers or caverns at different depths, one a low-pressure reservoir, and the other a high-pressure reservoir. Thermal energy storage and a heat pump are adopted to eliminate the need for external natural gas for heating the CO2 entering the energy recovery turbines. We carefully analyze the energy storage and recovery processes to reveal the actual efficiency of the system. We also highlight thermodynamic and sensitivity analyses of the performance of this fossil-fuel-free trans-critical energy storage system based on a steady-state mathematical method. It is found that the fossilfuel-free trans-critical CO2 energy storage system has good comprehensive thermodynamic performance. The exergy efficiency, round-trip efficiency, and energy storage efficiency are 67.89%, 66% and 58.41%, and the energy generated of per unit storage volume is 2.12 kW⋅h/m 3 , and the main contribution to exergy destruction is the turbine re-heater, from which we can quantify how performance can be improved. Moreover, with a relatively higher energy storage and recovery pressure and lower pressure in the low-pressure reservoir, this novel system shows promising performance.

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Performance analysis of a novel energy storage system based on liquid carbon dioxide

Cited by 132 publications

References 11 publications

Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

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

Thermodynamic analysis of a novel fossil‐fuel–free energy storage system with a trans‐critical carbon dioxide cycle and heat pump

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Performance analysis of a novel energy storage system based on liquid carbon dioxide

Cited by 132 publications

References 11 publications

Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

Thermodynamic analysis of a novel compressed carbon dioxide energy storage system with low‐temperature thermal storage

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

Thermodynamic analysis of a novel fossil‐fuel–free energy storage system with a trans‐critical carbon dioxide cycle and heat pump

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