Influence of the radial-inflow turbine efficiency prediction on the design and analysis of the Organic Rankine Cycle (ORC) system

Song, Jian; Gu, Chen; Ren, Xiaodong

doi:10.1016/j.enconman.2016.06.037

Cited by 80 publications

(28 citation statements)

References 25 publications

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“…Turbine efficiency has a great influence on the optimal working condition and the thermodynamic performance. Several studies [22][23][24] have pointed out that the turbine efficiency with a constant value may mislead when determining the optimal working conditions for a specific ORC system. Hence, the turbine efficiency should be not arbitrarily fixed to a constant value but rather vary according to the operating conditions at the turbine inlet and outlet.…”

Section: Orc System Conditions and Constraintsmentioning

confidence: 99%

Guidelines for Optimal Selection of Subcritical Low-Temperature Geothermal Organic Rankine Cycle Configuration Considering Reinjection Temperature Limits

Zhang

Yuan³

et al. 2018

Energies

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General guidelines are proposed to select the optimal subcritical organic Rankine cycle configuration considering reinjection temperature limits for a low-temperature geothermal brine power plant. Saturated/superheated, non-regenerative/regenerative cycles are investigated. Evaporating temperature and overheating degree at the turbine inlet are selected as design variables, and highest plant exergy efficiency is pursued for current optimizations. Through theoretical analysis of mathematical modelling and typical case studies, a simple optimization approach is presented. The new approach consists of up to three judgements on reinjection temperature and evaporating temperature in comparison two optimization calculations along the saturated line and along the given reinjection temperature line. The potential optimal cycle configurations are saturated non-regenerative cycle, saturated regenerative cycle and superheated regenerative cycle. Then, this new optimization approach is applied to obtain optimal cycle configuration and relevant working condition. The working fluids investigated are R245fa, R1234ze(Z), isopentane, and isobutane. The saturated non-regenerative cycle is the optimal cycle when the reinjection temperature limit is equal or less than the optimal reinjection temperature with no reinjection constraint. Otherwise, the reinjection temperature limit influences not only the optimal cycle configuration but also the optimal working condition. Working fluid isobutane always achieves highest plant exergy efficiency for optimal cycles with either reinjection temperature limit.

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Section: Orc System Conditions and Constraintsmentioning

confidence: 99%

Guidelines for Optimal Selection of Subcritical Low-Temperature Geothermal Organic Rankine Cycle Configuration Considering Reinjection Temperature Limits

Zhang

Yuan³

et al. 2018

Energies

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“…The turbine isentropic efficiency, system thermal efficiency and net power were 84.33%, 13.5% and 534 kW respectively. Song et al [12] investigated the effect of an RIT's performance on the analysis of an ORC system related to operating conditions and working fluids.…”

Section: Introductionmentioning

confidence: 99%

An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

Jubori

Al-Dadah

Mahmoud

2017

Energy Conversion and Management

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“…A detailed mean-line methodology and parametric analysis are conducted to obtain the maximum efficiency of a radial inflow turbine used in an organic Rankine cycle [11][12][13][14]. Some authors suggest the various well-established loss model correlations, and some modifications are summarized for accurate and robust design of small scale radial turbine, but none of them reported to use these methodologies for cryogenic turbine [15,16].…”

Section: Introductionmentioning

confidence: 99%

Preliminary design, flow field, and thermal performance analysis of a helium turboexpander: a numerical approach

et al. 2019

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Most studies on cryogenic turboexpanders are focused on parametric studies and mean-line design to increase the performance of cryogenics liquefaction cycle without much attention to the splitter blades which are crucial for the stability of the flow field. This study focuses on a novel mean-line design methodology to develop the radial turbine and nozzle (hereafter renowned as turboexpander) to investigate the performance characteristics. Firstly, Sobol sensitivity analysis is performed to identify the effect of major non-dimensional design variables on isentropic efficiency of the turbine. Secondly, the non-dimensional design variables are optimized using artificial intelligence techniques. Thirdly, three turboexpander models with and without splitter blades are designed within the optimized range of non-dimensional variables. After that, the three-dimensional numerical analysis is carried out to visualize the effect of splitter blades on flow field and thermal characteristics of the turboexpander. It is noticed that the passage vortices and flow separation are minimized using the splitter blades. The numerical results are further validated with available data in the literature. A detailed comparative analysis of Mach number, pressure, temperature, velocity, static enthalpy, static entropy, etc., is carried out at different operating conditions. The results reveal that the use of splitter blades has a tremendous effect on the performance and flow field characteristics of the radial turbine. The proposed methodology specifies the insights for an optimum turbine design methodology of a cryogenic turboexpander, Sobol sensitivity analysis, prediction capability of artificial intelligence methods, numerical techniques to simulate the assimilating performance of turboexpander, as it is the most crucial and expensive component of turboexpander-based cryogenic system. KeywordsHelium turboexpander · Splitter blade · Sobol method · Flow pattern · Thermal characteristics · Artificial intelligence List of symbols Variables bBlade height (m) C Absolute velocity (m/s)

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Influence of the radial-inflow turbine efficiency prediction on the design and analysis of the Organic Rankine Cycle (ORC) system

Cited by 80 publications

References 25 publications

Guidelines for Optimal Selection of Subcritical Low-Temperature Geothermal Organic Rankine Cycle Configuration Considering Reinjection Temperature Limits

Guidelines for Optimal Selection of Subcritical Low-Temperature Geothermal Organic Rankine Cycle Configuration Considering Reinjection Temperature Limits

An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

Preliminary design, flow field, and thermal performance analysis of a helium turboexpander: a numerical approach

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