Analysis of the supercritical organic Rankine cycle and the radial turbine design for high temperature applications

Dong, Bensi; Xu, Guoqiang; Luo, Xianglong; Zhuang, Laihe; Quan, Yongkai

doi:10.1016/j.applthermaleng.2016.12.123

Cited by 46 publications

(19 citation statements)

References 27 publications

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“…The operating parameters of the SORC system are summarized in Table . More details concerning the working fluid selection and system performance analysis can be found in our previous study …”

Section: Modellingmentioning

confidence: 99%

Multi‐objective optimization design of plate‐fin vapor generator for supercritical organic Rankine cycle

Zhu

Quan

et al. 2019

Int J Energy Res

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Summary Supercritical organic Rankine cycle (SORC) is an improved ORC architecture with lower exergy destruction and better heat source utilization when compared with a subcritical one. The accurate design of its vapor generator is of critical importance due to the fact that heat transfer performance significantly affects thermal efficiency, power output, and size of the overall system. This paper aims to develop a mathematical model of the SORC vapor generator using plate‐fin heat exchanger. The finite volume method is applied to deal with the properties' variation problem of the supercritical fluids. Multi‐objective optimization is employed by the nondominated sorting genetic algorithm II to find the optimum geometry design. The objective functions are the number of entropy production units, annual cost, and volume. For a specific SORC system, an optimum vapor generator is designed using the developed model. Parametric studies are conducted to assess the effect of geometry parameters on the vapor generator performance. The off‐design performance of the vapor generator is also evaluated under different mass flow rates and different heat source inlet temperature conditions.

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Section: Modellingmentioning

confidence: 99%

Multi‐objective optimization design of plate‐fin vapor generator for supercritical organic Rankine cycle

Zhu

Quan

et al. 2019

Int J Energy Res

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“…In addition to optimizing the system parameters or working fluids of the ORC cycles, there are a number of studies aimed at improving the efficiency of the ORC components. Redesign and optimization of turbines and pumps are examples of these improvement efforts [43][44][45]. The use of a regenerator and operating in supercritical conditions is also often applied to improve the system performance [46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration

2019

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In the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the working fluid for both the subcritical and supercritical rORC. During the parametric optimisation, the net power production, mass flow rate, exchanged heat in the regenerator, total pump power consumption, thermal and exergetic efficiencies of rORC were calculated for varying turbine inlet temperatures and pressures. After parametric optimisation of the rORC, the results were compared with the results of the previous study, in which only a simple ORC is analysed and parametrically optimised. Moreover, the effect of the regenerator was revealed by examining all results together. Finally, the exergetic analysis of the best performing subcritical and supercritical rORC was performed. Furthermore, the results of the present and previous studies were considered together and it is clearly seen that the subcritical rORC shows the best performance. Consequently, by using the subcritical rORC, the disadvantages of the using simple ORC (low performance) and supercritical cycle (safety, investment) can be eliminated and system performance can be improved.

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“…In order to achieve higher thermal efficiency, the initial parameters of organic working fluid at the turbine inlet are close to the critical point which is the called real-gas thermodynamic region. Therefore, the ideal gas law does not apply anymore, and an accurate thermodynamic model is required to calculate the organic working fluid thermodynamic properties for one-dimensional preliminary design and Computational Fluid Dynamics (CFD) simulation of ORC turbines [8,9]. Lio et al [10] conducted an optimum design of a single stage radial-inflow turbine based on the mean-line model.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effects of Blade Installation Angle and Blade Number on Radial-Inflow Turbine Stator Flow Performance

Han

Jia

et al. 2018

Energies

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Organic Rankine cycle (ORC) is a reliable technology to recover low-grade heat sources. The radial-inflow turbine is a critical component, which has a significant influence on the overall efficiency of ORC system. This study investigates the effects of the blade installation angle and blade number on the flow performance of radial-inflow turbine stator. R245fa and toluene were selected as the working fluids in the low and high temperature range, respectively. Two-dimensional stator blades model for the two working fluids were established, and numerical simulation was conducted through Computational Fluid Dynamics (CFD) software. The results show that for low temperature working fluid R245fa, when the installation angle is 32° and blade number is 22, the distribution of static pressure along the stator blade has no obvious pressure fluctuation, and the flow loss is least. Meanwhile, the stator blade obtained the optimal performance. For high temperature working fluid toluene, when the installation angle is 28° and blade number is 32, the average outlet temperature is the lowest, while the average outlet velocity is the largest. The flow state is well and smooth, and the remarkable flow separation and shock wave are not present. Moreover, the stator blade for R245fa has a larger chord length, cascade inlet diameter, and cascade outside diameter but a lower blade number compared to toluene.

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Analysis of the supercritical organic Rankine cycle and the radial turbine design for high temperature applications

Cited by 46 publications

References 27 publications

Multi‐objective optimization design of plate‐fin vapor generator for supercritical organic Rankine cycle

Multi‐objective optimization design of plate‐fin vapor generator for supercritical organic Rankine cycle

Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Through the Use of Regeneration

Analysis of the Effects of Blade Installation Angle and Blade Number on Radial-Inflow Turbine Stator Flow Performance

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