Conventional and advanced exergy analysis of a novel transcritical compressed carbon dioxide energy storage system

Liu, Zhan; Liu, Bin; Guo, Junyi; Xin, Xuan; Yang, Xiaohu

doi:10.1016/j.enconman.2019.111807

Cited by 111 publications

(27 citation statements)

References 45 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%

“…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%

“…Therefore, they used the advanced exergy analysis method to evaluate the performance of the CAES system and CCES system with a high‐temperature source (around 750 K). 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.…”

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%

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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“…[ 4,5 ] A logical and promising solution of the contradictory problem is coupling a large‐scale energy storage system with renewable energy sources, which would reduce the curtailment and increase the capacity of the renewable energy generation. [ 6–9 ] Among numerous energy storage technologies, compressed air energy storage (CAES) has gained great consideration worldwide in recent years due to its stable operation, high reliability, high efficiency, low cost, long lifetime, and large‐scale energy storage capability. [ 10–12 ]…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a Hybrid Electrical Energy Storage System Integrating High‐Temperature Thermal Energy Storage and Compressed Air Energy Storage for Mitigating Renewable Energy Curtailment

Cao

Cong

2021

Energy Tech

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Compressed air energy storage (CAES) system can smooth out the fluctuated power from renewable energy and allow it to meet electricity demands reliably. It further enables the mitigation of renewable energy curtailment. A hybrid energy storage system integrating high‐temperature thermal energy storage (HTTES) and CAES is proposed. In the energy charging process, the high‐ and low‐quality power from renewable energy are stored separately in the air storage reservoir (ASR) and HTTES system. In the energy discharging process, the compressed air is heated to high temperature in the HTTES system and finally expands in air turbines for electricity generation. Thermodynamic analysis reveals that a round trip efficiency of 64.36% with an energy storage density of 5.38 kWh m−3 can be achieved. It is found that the proposed hybrid system has the beneficial effect of improving the system performance. The largest exergy destruction takes place in the HTTES system. The round trip efficiency is mostly sensitive to the output temperature of HTTES, the isentropic efficiency of compressors and turbines, and the maximum and minimum operating pressures of ASR.

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“…It is also reported that the oil demand will increase by 30% all around the world from 2007 to 2035 [2]. The increasing consumption of fossil fuels has brought serious energy shortages, environmental pollution, and global warming [3][4][5]. On one hand, measures can be made to promote the conversion efficiency of the existing energy systems.…”

Section: Introductionmentioning

confidence: 99%

Parametric Assessment on the Advanced Exergy Performance of a CO2 Energy Storage Based Trigeneration System

Sun

Liu

2020

Applied Sciences

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In this paper, conventional and advanced exergy analyses are comprehensively introduced on an innovative transcritical CO2 energy storage based trigeneration system. Conventional exergy analysis can quantify in an independent way the component exergy destruction. However, the advanced technology is able to evaluate the interactions among components and identify the tangible promotion potential by allowing for the technical and economic limitations. In this method, the component exergy destruction is separated into avoidable and unavoidable parts, as well as the endogenous/exogenous parts. Calculation of the split parts is carried out by utilizing the thermodynamic cycle-based approach. Results coming from conventional exergy analysis indicate that the first three largest exergy destructions are given by cold storage, compressor 1, and heat exchanger 3. However, advanced analysis results demonstrate that the cold storage, compressor 1, and compressor 2 should be given the first improvement priority in sequence by depending on the avoidable exergy destruction. The turbine efficiency produces a higher impact on overall exergy destruction than compressor efficiency. The pinch temperature in cold storage causes the highest effect on exergy destruction amongst all the heat exchangers. There exists an optimum value in the compressor inlet pressure and ambient temperature.

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Conventional and advanced exergy analysis of a novel transcritical compressed carbon dioxide energy storage system

Cited by 111 publications

References 45 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 Hybrid Electrical Energy Storage System Integrating High‐Temperature Thermal Energy Storage and Compressed Air Energy Storage for Mitigating Renewable Energy Curtailment

Parametric Assessment on the Advanced Exergy Performance of a CO2 Energy Storage Based Trigeneration System

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