Graph theory-based heat current analysis method for supercritical CO2 power generation system

Xia, Li; Chen, Qun; Chen, Xi; He, Ke-Lun; Hao, Jianli

doi:10.1016/j.energy.2020.116911

Cited by 18 publications

(8 citation statements)

References 31 publications

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“…As shown in Figure 1, the characteristic temperature difference is the inlet temperature difference of the cold and hot fluid of the heat exchanger, Q is the heat flux, and the analogy is current, and R is the dissipative heat resistance. Furthermore, the energy flow model of the heat exchanger is applied to different systems in Zhao and colleagues 18–21 . Yao et al 1 based on the theory of entransy, an energy flow model of heat exchanger suitable for sneak path analysis of the thermal system is proposed.…”

Section: Sneak Analysis Model Of Thermal Equipmentmentioning

confidence: 99%

“…Furthermore, the energy flow model of the heat exchanger is applied to different systems in Zhao and colleagues. [18][19][20][21] Yao et al 1 based on the theory of entransy, an energy flow model of heat exchanger suitable for sneak path analysis of the thermal system is proposed. In this paper, the energy flow model of the heat exchanger is improved on the basis of the proposed heat exchanger energy flow model, and the heat exchanger energy flow model used in this paper for sneak analysis is obtained, as shown in Figure 2.…”

Section: Improved Sneak Analysis Model Of Heat Exchangermentioning

confidence: 99%

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Research on the sneak circuit analysis method of a thermal system based on energy flow

Shen

Yao

Wang

et al. 2022

Energy Science & Engineering

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Based on the energy flow analysis method, this paper establishes the relationship between the heat accumulator and the thermal system from the perspective of heat transfer. Different types of heat accumulators are converted into different equivalent models based on energy flow, the existing sneak circuit analysis methods based on energy flow are optimized, and the starting point and end point of path search are redefined. The energy flow‐based correlation method proposed in this paper is applied to a system with two different types of heat accumulators. The results show that the sneak circuit analysis method based on energy flow proposed in this paper can search for more paths and discover new sneak circuits on the basis of the original method. Therefore, the new method is feasible and effective.

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Section: Sneak Analysis Model Of Thermal Equipmentmentioning

confidence: 99%

Section: Improved Sneak Analysis Model Of Heat Exchangermentioning

confidence: 99%

Research on the sneak circuit analysis method of a thermal system based on energy flow

Shen

Yao

Wang

et al. 2022

Energy Science & Engineering

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show abstract

“…As for other genetic information, the interest readers can refer to the literature. 38,39 For Process 1, the parameters consist of HPT inlet temperature, compressor, and LPT inlet pressure. The corresponding variable ranges are listed in Table 13.…”

Section: Parameter Optimizationmentioning

confidence: 99%

Constructing a novel supercritical carbon dioxide power cycle with the capacity of process switching for the waste heat recovery

Xiao

Lin

et al. 2021

Intl J of Energy Research

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In order to improve the utilization efficiency of fossil energy, a novel supercritical carbon dioxide (S-CO 2 ) cycle for flue gas waste heat recovery is constructed in this paper. The system can easily change the cycle processes through the switching of a triple valve. To investigate the system performances, the corresponding energy, exergy, and economy models are established. Various performances are obtained and compared with those of recompression cycle under design conditions. Thereafter, effects of key parameters on cycle performance are analyzed. In addition, according to the economic analysis, the net work is optimized to get the maximum value by genetic algorithm (GA) optimization. The results show that the proposed system has better performances than the recompression cycle. Under the optimal conditions, the net work of Process 1 and Process 2 are respectively 2912.34 and 2308.32 kW, which are 279.76 and 174.62 kW higher than the works under design conditions. Finally, the optimal performances of two processes are obtained, when the flue gas temperature varies from 250 C to 550 C. The results indicate that if the flue gas temperature is below 310 C, the net work of Process 2 is higher. Otherwise, the net work of Process 1 is higher. Thus, in the practical engineering, according to the measured flue gas temperature, the system should be switched into different processes to achieve efficient operations.GA optimization, performance comparison, process switching, S-CO 2 power cycle, waste heat recoveryRecently, with the accumulation of CO 2 emission from human industry, global warming has become increasingly serious. Thus, in order to slow down the tendency, it's urgent to reduce carbon emissions. In this regard, Abbreviations: CO 2 , supercritical carbon dioxide; HPT, high-pressure turbine; HTR, high-temperature recuperator; LPT, low-pressure turbine; LTR, low-temperature recuperator; ORC, organic Rankine cycle; PPTD, pinch point temperature difference; PR, pressure ratio; WHR, waste heat recovery.

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“…由于热量流方法中不对物理过程进行额外的数学简化, 其分析与计算结果更为准确. 目前, 热量流法已被应用于多种热力系统的模拟与优化研究中, 如换热系统 [24] 、蒸汽发电循环 [25] 、有机朗肯循环 [26] 、吸收式储能系统 [27,28] 与制冷系统 [29] 、超临界CO 2 换热 [30] 与发电循环 [31] 、水泥回转窑余热回收系统 [32] 和移动填充床 [33] 等. 由于热系统热量流模型具有电路图的形式, 热量流法也被应用于电-热综合能源系统的分析与优化中 [34,35] .…”

Section: 该方法在工程分析中应用广泛但系统的性能优劣严unclassified

Heat current method for integrated analysis and optimization of thermodynamic systems

Zhao¹,

Chen²,

He³

et al. 2021

Sci. Sin.-Tech.

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Graph theory-based heat current analysis method for supercritical CO2 power generation system

Cited by 18 publications

References 31 publications

Research on the sneak circuit analysis method of a thermal system based on energy flow

Research on the sneak circuit analysis method of a thermal system based on energy flow

Constructing a novel supercritical carbon dioxide power cycle with the capacity of process switching for the waste heat recovery

Heat current method for integrated analysis and optimization of thermodynamic systems

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