Investigation of the organic Rankine cycle (ORC) system and the radial-inflow turbine design

Li, Yan; Ren, Xiaodong

doi:10.1016/j.applthermaleng.2015.12.009

Cited by 81 publications

(33 citation statements)

References 15 publications

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“…Figure 7 displays the variations of VFR with evaporation temperature at four different degrees of superheat conditions. In order to validate the correctness and reliability of the VFR calculation results, the VFR values of isohexane, R365mfc, R245ca, R245fa, and butane (R600) with 0 • C degree of superheat were compared with their respective results in Li and Ren [39]. A good agreement between the present VFR values and the results of Li and Ren [39] was noted.…”

Section: Thermodynamic Performance Analysismentioning

confidence: 60%

“…In order to validate the correctness and reliability of the VFR calculation results, the VFR values of isohexane, R365mfc, R245ca, R245fa, and butane (R600) with 0 • C degree of superheat were compared with their respective results in Li and Ren [39]. A good agreement between the present VFR values and the results of Li and Ren [39] was noted. VFR = 8.0 represented by dashed lines as shown in Figure 7 was taken as a reference value [39], and the VFR values of the selected working fluids should not exceed it much more.…”

Section: Thermodynamic Performance Analysismentioning

confidence: 60%

“…This factor accounts for the effects of volume expansion and compressibility [28,39]. Then, the parameter was investigated in other works to study the characters of the turbine in the ORC system [28,39,40]. The VFR is defined as the specific volume variation of working fluid across the turbine [28], and a moderate VFR is preferred in the ORC system.…”

Section: Of 23mentioning

confidence: 99%

“…A high built-in VFR needs a large variation rate of rotor blade height between the Energies 2017, 10, 1593 13 of 23 inlet and outlet, and manufacturing costs and difficulties increase [40]. Therefore, a moderate VFR which achieves a tradeoff between lower structural complexity and less under-expansion irreversibility is essential [39]. Figure 7 displays the variations of VFR with evaporation temperature at four different degrees of superheat conditions.…”

Section: Thermodynamic Performance Analysismentioning

confidence: 99%

“…Thus, in order to address Many efforts have been made with respect to working fluid selection and parametric optimization, considering thermodynamic or economic factors. However, very few similar works focus on discussing the limitation of volume flow ratio (VFR) [28,39,40], a factor which has a significant influence on turbine design and manufacture. In this study, a turbine is selected as expander in the investigated regenerative ORC system.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-Economic Performance Analysis of a Regenerative Superheating Organic Rankine Cycle for Waste Heat Recovery

Han

et al. 2017

Energies

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Abstract:The Organic Rankine Cycle (ORC) is a promising form of technology for recovering low-grade waste heat. In this study, a regenerative ORC system is established to recover the waste flue gas of 160 • C. Focusing on thermodynamic and economic performance while simultaneously considering the limitations of volume flow ratio (VFR) and the effect of superheat, working fluid selection and parameter optimization have been investigated. The optimization of the evaporation temperature is carried out by analyzing the variation of net power output and specific investment cost (SIC). Then, the net power output, specific net power output, total exergy destruction rate, VFR, total capital cost, and levelized electricity cost (LEC) are selected as criteria, and a fuzzy multi-criteria evaluation method is adopted to select a more suitable working fluid and determine the optimal degree of superheat. In addition, the preheating coefficient, latent heat coefficient, superheating coefficient, and internal heat coefficient were proposed to explore the effect of working fluid critical temperature on thermal efficiency. Research studies demonstrate that there is an optimal evaporation temperature, maximizing net power output and minimizing the SIC. Isohexane and butane have greater specific net power output due to greater latent heat. A suitable degree of superheat is not only conducive to improving the working capacity of working fluids, but also reduces the VFR, total capital cost, SIC, and LEC for different working fluids. Thus, the system's thermodynamic and economic performance-as well as the operational stability-are improved. Among the six working fluids, butane exhibits the best comprehensive performance, and its optimal evaporation temperature and degree of superheat are 100 • C and 5 • C, respectively.

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Section: Thermodynamic Performance Analysismentioning

confidence: 60%

Section: Thermodynamic Performance Analysismentioning

confidence: 60%

Section: Of 23mentioning

confidence: 99%

Section: Thermodynamic Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermo-Economic Performance Analysis of a Regenerative Superheating Organic Rankine Cycle for Waste Heat Recovery

Han

et al. 2017

Energies

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Improved thermodynamic and aerodynamic design method and off‐design performance analysis of a radial inflow turbine for ORC system

Han

Jia

2019

Int J Energy Res

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Summary Radial inflow turbine is one of the crucial components of organic Rankine cycle (ORC) system, which has great impact on the performance of system. R245fa was selected as the working fluid to recycle the waste heat source with a temperature of 350 to 400 K. The genetic algorithm (GA) was employed in thermodynamic design to optimize the 10 key design parameters, which are needed in aerodynamic design of the ORC turbine. Isotropic efficiency was the fitness function of 10 key variables in GA. The three‐dimensional geometry model was built based on the thermodynamic and aerodynamic design and then was imported into the commercial software ANSYS‐CFX to conduct viscous numerical simulation. Based on the three‐dimensional simulation, the off‐design performance in different mass flow rate, static inlet temperature coupled with different rotational speed was investigated respectively. The results show that at design condition, the maximum efficiency deviation is only 2.5% with the rotational speed variations among the range of 10%, so the radial inflow turbine designed in this research possesses great off‐design performance.

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Withdrawn: Flow field analysis of a turbo expander based on organic rankine cycle for geothermal power system simulation

Guo

Zhao

Jia

2023

Energy Science & Engineering

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Over these years, people paid more attention to using renewable energy such as geothermal energy to decrease the dependency on fossil fuel energy. Organic Rankine Cycle (ORC) can generate electricity by using low‐temperature heat sources, and geothermal energy is an ideal pollution‐free heat source that can provide continuous and stable energy. Meanwhile, the turbo expander, one of the essential components in ORC, has the advantages of high speed and single‐stage expansion ratio. In this work, we simulated and analyzed the flow field characteristics of the turbo expander under the assigned working conditions using CFX software. The results showed that the working fluid distributed uniformly in the volute, and there was no apparent whirlpool flow or secondary flow. The pressure near the leading edge of the impeller blade was sparse but became dense at the vicinity of the trailing edge. When the speed of the expander was 15000rad min‐1 and the inlet pressure was 0.59MPa, the isentropic efficiency reached the maximum value, and the change of the inlet temperature had little effect on the isentropic efficiency, which can be ignored in actual operation. The results guide in improving the practical application of geothermal energy.This article is protected by copyright. All rights reserved.

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Investigation of the organic Rankine cycle (ORC) system and the radial-inflow turbine design

Cited by 81 publications

References 15 publications

Thermo-Economic Performance Analysis of a Regenerative Superheating Organic Rankine Cycle for Waste Heat Recovery

Thermo-Economic Performance Analysis of a Regenerative Superheating Organic Rankine Cycle for Waste Heat Recovery

Improved thermodynamic and aerodynamic design method and off‐design performance analysis of a radial inflow turbine for ORC system

Withdrawn: Flow field analysis of a turbo expander based on organic rankine cycle for geothermal power system simulation

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