Unsteady and three-dimensional computational fluid dynamics modelling of scroll expander for low-grade waste heat recovery transcritical carbon dioxide micro-scale power system

Du, Yuheng; Tian, Gui Yun; Pekris, Michael J.

doi:10.1016/j.enconman.2023.116857

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…They are geometry design, CFD validations, data science, and machine learning. Detailed descriptions of the geometry design, numerical methods, and CFD validations can be found in Du et al [25]. The following subsections briefly introduce the data science and machinery learning process, while the geometry and CFD settings are briefly introduced.…”

Section: Methodsmentioning

confidence: 99%

“…Two objectives are defined as f η I (isentropic efficiency) and f cost (manufacturing cost). The reason to choose isentropic efficiency as an objective is that it is the key parameter to reflect the machinery's performance and its trend is similar to the second-law efficiency from the thermodynamic analysis [25]. To simplify the equations, f 1 and f 2 replace f η I and f cost .…”

Section: Surrogate-assisted Multi-objective Optimisationmentioning

confidence: 99%

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Surrogate-Assisted Multi-Objective Optimisation of Transcritical Carbon Dioxide Scroll Expander Flank Clearance Based on Computational Fluid Dynamics

Pekris

et al. 2023

Energies

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Transcritical carbon dioxide waste heat recovery systems and the construction of scroll expanders have recently been hot topics. The flank clearance, located between the orbiting and fixed scroll, has a vital impact on the scroll expander performance. This paper estimates the effect of the flank clearance on the expander’s thermodynamic performance (first-law efficiency) based on computational fluid dynamics (CFD) simulations. The manufacturing cost of different flank clearances is also considered to enhance the feasibility of the machinery design. The computational cost for different flank clearance cases is significantly reduced with a surrogate-assisted multi-objective optimisation algorithm (SAMOA), which also supports modelling the trade-off relationship between manufacturing cost and machinery efficiency. The results indicated that an increasing flank clearance negatively affects the first-law thermal efficiency. The efficiency decreased from 87.41% to 44.83% moving from 20 to 200 μm flank clearances. The SAMOA successfully reduced the computational cost of the dynamic mesh CFD model from 90 h to 15 s with 0.6% discrepancy. The final Pareto solutions presented a clear trade-off relationship between the first-law efficiency and manufacturing cost and promised a diversity of optimum solutions. The “knee points” for the relationship were 25, 55, and 127 μm, which provided flexible clearance choices based on the importance of either machinery efficiency or manufacturing cost.

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Section: Methodsmentioning

confidence: 99%

Section: Surrogate-assisted Multi-objective Optimisationmentioning

confidence: 99%

Surrogate-Assisted Multi-Objective Optimisation of Transcritical Carbon Dioxide Scroll Expander Flank Clearance Based on Computational Fluid Dynamics

Pekris

et al. 2023

Energies

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“…Song et al (10) performed three-dimensional numerical simulations of a Vortex Swellers with different suction port positions based on CFD. Du et al (11) compared the performance differences between T-CO2 and R123. CO2 and R123 performance differences, T-CO2 exhibited better performance with an average isentropic efficiency 14% higher than that of R123.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Operating Parameters of a Scroll Expander Based on Response Surface and NSGA II

Shi,

Peng

2024

IJE

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Adjusting the operating parameters to optimize the performance of the scroll expander has been a hot research topic among scholars. This paper innovatively combines the response surface method and NSGA2 algorithm for parameter optimization. This novel method can accurately predict the optimal operating parameters of the scroll expander and improve the overall efficiency of the scroll expander. Initially, a three-dimensional transient simulation model of the scroll expander was established, and the effects of three key operating parameters (suction pressure, exhaust pressure, and rotational speed) on the output power and isentropic efficiency of the scroll expander were analyzed through numerical simulation. On this basis, the response surface model between the input parameters and the objective function was established by using the response surface methodology. Consequently, three different optimization algorithms were compared, and it was found that NSGA-II had a better performance both in terms of convergence and solution performance,. Threfore, the NSGA-II algorithm was used for the multi-objective optimization. Under the premise of considering the maximum output power and isentropic efficiency, based on the established response surface model, the Pareto optimal solution was used to determine the optimal combination of its operating parameters: suction pressure of 1.62 MPa, exhaust pressure of 0.45 MPa, and rotational speed of 2,099.58 rpm.Finally, the numerical model is verified by the laboratory-built test bed of the Organic Rankine cycle low-temperature waste heat oilfree power generation system. The experimental results match well with the numerical simulation results and verify the model accuracy. The results from this pioneering and thorough thr study will provide a solid benchmark for the development and refinement of upcoming scroll machines.

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CFD analysis of flank clearance sizes on micro-scale transcritical CO2 scroll expander

Pekris

Tian

2023

Applied Thermal Engineering

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Unsteady and three-dimensional computational fluid dynamics modelling of scroll expander for low-grade waste heat recovery transcritical carbon dioxide micro-scale power system

Cited by 7 publications

References 33 publications

Surrogate-Assisted Multi-Objective Optimisation of Transcritical Carbon Dioxide Scroll Expander Flank Clearance Based on Computational Fluid Dynamics

Surrogate-Assisted Multi-Objective Optimisation of Transcritical Carbon Dioxide Scroll Expander Flank Clearance Based on Computational Fluid Dynamics

Optimization of Operating Parameters of a Scroll Expander Based on Response Surface and NSGA II

CFD analysis of flank clearance sizes on micro-scale transcritical CO2 scroll expander

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