Justification of CO2 as the working fluid for a compressed gas energy storage system: A thermodynamic and economic study

Liu, Zhan; Yang, Xuqing; Jia, Wenguang; Li, Hailong; Yang, Xiaohu

doi:10.1016/j.est.2019.101132

Cited by 66 publications

(11 citation statements)

References 47 publications

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“…Typical methods for their storage require costly engineering controls and present safety hazards that are potentially problematic for wide‐scale implementation. These methods typically involve storage at exceptionally high pressures or liquefaction by cooling to cryogenic temperatures [4, 5] …”

Section: Introductionmentioning

confidence: 99%

Gas Storage in Porous Molecular Materials

Deegan

Dworzak

Gosselin

et al. 2021

Chemistry A European J

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Molecules with permanent porosity in the solid state have been studied for decades. Porosity in these systems is governed by intrinsic pore space, as in cages or macrocycles, and extrinsic void space, created through loose, intermolecular solid‐state packing. The development of permanently porous molecular materials, especially cages with organic or metal–organic composition, has seen increased interest over the past decade, and as such, incredibly high surface areas have been reported for these solids. Despite this, examples of these materials being explored for gas storage applications are relatively limited. This minireview outlines existing molecular systems that have been investigated for gas storage and highlights strategies that have been used to understand adsorption mechanisms in porous molecular materials.

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Section: Introductionmentioning

confidence: 99%

Gas Storage in Porous Molecular Materials

Deegan

Dworzak

Gosselin

et al. 2021

Chemistry A European J

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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%

“…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 . Furthermore, even if a perfect heat transfer process in HX 4 could be realized thanks to the setting of parameters, MITA in HX 4 cannot be lower than 5 K. Therefore, the value of MITA in HX 4 is no less than 5 K, as shown in Table 4.…”

Section: Results For a Reference Configurationmentioning

confidence: 99%

“…Some assumptions about the system model are as follows 22,28,29,31,44 : The system operates under a steady‐state condition. The leakage of working fluids (ie, CO 2 and water) in the system is negligible. The heat transfer between system components (ie, regenerators, heat exchangers, and TES) and the environment is neglected. Pressure drop and heat dissipation of working fluids in pipes are not taken into account. Pressure change and power consumption in S and LSTs are neglected. Energy conversion efficiencies in motor and generator are neglected. The processes of streams flowing through LSTs are assumed as isothermal and isobaric, and the state changes of CO 2 in LSTs during the charge process and the discharge process are not taken into account. The cooling water tank (CWT) can dissipate heat to the environment, thus the temperature in CWT could be kept constant (ie, 293.15 K). …”

Section: Thermodynamic Model Of This Novel Systemmentioning

confidence: 99%

“…Similarly, Liu et al 28 adopted the advanced exergy analysis method to analyze the thermodynamic characteristics of a transcritical CO 2 energy storage system and compared the results with those obtained by the conventional exergy analysis method. The thermodynamic and economic evaluation of a CCES system was carried out by Liu et al, 29 and they also adopted a genetic algorithm to optimize the CCES system. Furthermore, Liu et al 30 adopted the advanced exergy analysis method to study the thermodynamic characteristics of a liquid CO 2 energy storage system and analyzed the energy storage and energy release characteristics of the system from the perspective of exergy.…”

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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Performance analysis of a pumped hydro assisted near‐isothermal compressed carbon dioxide energy storage system with gas/liquid phase change process

Zhao

Zhang

et al. 2022

Intl J of Energy Research

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The energy storage device is indispensable in future power system due to the high share of renewable energies. Compressed gas energy storage (CGES) technology, including the compressed air energy storage (CAES), has been widely recognized as one of the most promising solutions in energy storage domain. Among multiple CAES forms, the isothermal CAES is a potential type in which the ideal round trip efficiency (RTE) can be 100%. On the other hand, carbon dioxide (CO 2 ) as an excellent working medium in CGES system owing to its favorable properties. However, the existing isothermal type CGES systems just employ the air as working medium, the potential of CO 2 in such system is not evaluated yet. Therefore, an 800 kW pumped hydro assisted near-isothermal compressed carbon dioxide energy storage system with gas/liquid phase change process is proposed. In detail, the hydraulic machineries, the flexible rubber diaphragm and the helical coils are employed to realize the near-isothermal process and high RTE. The transient models are built and system performance is thus investigated. The results show that the system possesses 68.36% in RTE and 1.0914 kWh/m 3 in energy density (ED) under the design condition. Meanwhile, the water temperature in helical coil, the initial and maximum pressures of vessel and the vessel volume are sensitive for system behavior.carbon dioxide, compressed gas energy storage, near-isothermal process, Pelton turbine, performance analysis | INTRODUCTIONTo fulfill the Paris Agreement and step towards a sustainable society, the energy sector should make more effort to build a new power system. The main feature of future power system is the high share of fluctuant renewable energy, which is motived by the global issues of depleted fossil fuels, seriously environmental pollution and

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Justification of CO2 as the working fluid for a compressed gas energy storage system: A thermodynamic and economic study

Cited by 66 publications

References 47 publications

Gas Storage in Porous Molecular Materials

Gas Storage in Porous Molecular Materials

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

Performance analysis of a pumped hydro assisted near‐isothermal compressed carbon dioxide energy storage system with gas/liquid phase change process

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