Fluid selection and advanced exergy analysis of dual-loop ORC using zeotropic mixture

Wang, Zhiqi; Xia, Xiao-Xia; Pan, Huihui; Zuo, Qingsong; Zhou, Nana; Xie, Baoqi

doi:10.1016/j.applthermaleng.2020.116423

Cited by 28 publications

(10 citation statements)

References 54 publications

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“…The exergy efficiency can be improved from 9.60% to 15.40% by system components optimization. Wang et al [24] presented advanced exergy analysis of dual-loop ORC using zeotropic mixture, and revealed the improvement potential of each component. Liao et al [25] revealed that the technical modification of expander and condenser in top ORC is beneficial to the ORC-ORC system efficiency improvement due to higher endogenous avoidable exergy destruction.…”

Section: Introductionmentioning

confidence: 99%

Energy, Conventional and Advanced Exergy Analysis of Low Temperature Geothermal Binary-flashing Cycle Using Zeotropic Mixtures

Zhao

Chen

et al. 2022

Preprint

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Due to deep utilization of geobrine and high net power output, binary flashing cycle (BFC) is deemed to be the future geothermal energy power generation technology. The BFC using R245/R600a zeotropic mixtures is presented in this paper. The thermodynamic model of the system is built, and energy, conventional and advanced exergy analysis are carried out, to reveal the real optimization potential. It is demonstrated that the optimal composition mass fraction of R245fa and dryness of working fluid at the evaporator outlet ranges are 0.30~0.50 and 0.40~0.60, considering the thermodynamic performance and the flammability of the mixtures, simultaneously. Conventional exergy analysis indicates that the maximum exergy destruction occurs in condenser, followed by expander, evaporator, flashing tank, preheater, high-pressure pump and low-pressure pump. While the advanced exergy analysis reveals that the expander should be given the first priority for optimization, followed by condenser and evaporator. The BFC has a large potential for improvement due to higher avoidable exergy destruction, about 48.6% of the total system exergy destruction can be reduced. And the interconnections among system components are not very strong, owing to small exogenous exergy destructions. It also demonstrates the effectiveness of advanced exergy analysis, and the approach can be extended to other energy conversion systems to maximize the energy and exergy savings for sustainable development.

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Section: Introductionmentioning

confidence: 99%

Energy, Conventional and Advanced Exergy Analysis of Low Temperature Geothermal Binary-flashing Cycle Using Zeotropic Mixtures

Zhao

Chen

et al. 2022

Preprint

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“…A comparison of thermodynamic and exergoeconomic performances for supercritical CO 2 recompression cycle combined with regenerative organic Rankine cycle using the zeotropic mixture as working fluid was reported in [18]. In [19], a complex thermo-economic-environmental optimization and advanced exergy analysis were applied for a dual-loop organic Rankine cycle (DORC) using zeotropic mixtures. The payback period was selected as an economic evaluation criteria and annual CO 2 emission reduction as an environmental evaluation criterion.…”

Section: Introductionmentioning

confidence: 99%

“…Higher performance was observed for the mixtures as working fluid of ORC. Both criteria, payback period and annual CO 2 emission reduction, could not be linked to the exergy variables (therefore, [19] was not included in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Exergy-Based Multi-Objective Optimization of an Organic Rankine Cycle with a Zeotropic Mixture

Fergani

Morosuk

Touil

2021

Entropy

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In this paper, the performance of an organic Rankine cycle with a zeotropic mixture as a working fluid was evaluated using exergy-based methods: exergy, exergoeconomic, and exergoenvironmental analyses. The effect of system operation parameters and mixtures on the organic Rankine cycle’s performance was evaluated as well. The considered performances were the following: exergy efficiency, specific cost, and specific environmental effect of the net power generation. A multi-objective optimization approach was applied for parametric optimization. The approach was based on the particle swarm algorithm to find a set of Pareto optimal solutions. One final optimal solution was selected using a decision-making method. The optimization results indicated that the zeotropic mixture of cyclohexane/toluene had a higher thermodynamic and economic performance, while the benzene/toluene zeotropic mixture had the highest environmental performance. Finally, a comparative analysis of zeotropic mixtures and pure fluids was conducted. The organic Rankine cycle with the mixtures as working fluids showed significant improvement in energetic, economic, and environmental performances.

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“…Therefore, it is particularly important to evaluate the performance of the DORC system under full operating conditions of the IC engines [30,31]. Table 2 simply lists the indicators used to evaluate the operating performance of ORC systems in recent years [32][33][34][35][36][37][38][39][40][41][42][43]. It can be seen from the table that only a few indicators are selected to evaluate the performance of the ORC system.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, for the DORC system for CNG engine WHR, it is particularly important to analyze the operating performance of HT loop, LT loop, and different components to comprehensively evaluate the system performance. Table 2 shows ORC systems in recent years [32][33][34][35][36][37][38][39][40][41][42][43]. It can be seen from the table that only a few indicators are selected to evaluate the performance of the ORC system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery

Yao

Zhang

2021

Energies

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Frequent fluctuations of CNG engine operating conditions make the waste heat source have uncertain, nonlinear, and strong coupling characteristics. These characteristics are not conducive to the efficient recovery of the DORC system. The systematic evaluation of the CNG engine waste heat source and the comprehensive performance of the DORC system is conducive to the efficient use of waste heat. Based on the theory of internal combustion (IC) engine thermal balance, this paper analyzes the dynamic characteristics of compressed natural gas (CNG) engine waste heat energy under full operating conditions. Then, based on the operating characteristics of the dual loop organic Rankine cycle (DORC) system, thermodynamic models, heat transfer models, and economic models are constructed. The dynamic response characteristics analysis and energy, exergy, and economic (3E) evaluation of the DORC system under full operating conditions are carried out. The results show that the maximum values of net power output, heat exchange area, and the minimum values of EPC (electricity production cost) and PBT (payback time) are all obtained under rated condition, which are 174.03 kW, 25.86 kW, 37.54 kW, 24.76 m2, 0.15 $/kW·h and 3.46 years. Therefore, the rated condition is a relatively ideal design operating point for the DORC system. The research in this paper not only provides a reliable reference for the comprehensive analysis and evaluation of the performance of the DORC system, but also provides useful guidance for the selection of appropriate DORC system design operating points.

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Fluid selection and advanced exergy analysis of dual-loop ORC using zeotropic mixture

Cited by 28 publications

References 54 publications

Energy, Conventional and Advanced Exergy Analysis of Low Temperature Geothermal Binary-flashing Cycle Using Zeotropic Mixtures

Energy, Conventional and Advanced Exergy Analysis of Low Temperature Geothermal Binary-flashing Cycle Using Zeotropic Mixtures

Exergy-Based Multi-Objective Optimization of an Organic Rankine Cycle with a Zeotropic Mixture

Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery

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