Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions

Yang, Ke; Zhang, Honggang; Song, Songsong; Yang, Fubin; Liu, Hao; Zhao, Guangyao; Zhang, Jian; Yao, Baofeng

doi:10.3390/en7042123

Cited by 28 publications

(12 citation statements)

References 32 publications

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“…As far as safe working conditions are concerned, a minimum level of superheating must be ensured at the inlet of the expander in order to avoid the formation of liquid droplets that could damage the expansion machine [7,8]. Several contributions focusing on the development of control strategies to ensure safe working conditions are available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control

et al. 2016

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Abstract:In this paper, the optimal operation of a stationary sub-critical 11 kW el organic Rankine cycle (ORC) unit for waste heat recovery (WHR) applications is investigated, both in terms of energy production and safety conditions. Simulation results of a validated dynamic model of the ORC power unit are used to derive a correlation for the evaporating temperature, which maximizes the power generation for a range of operating conditions. This idea is further extended using a perturbation-based extremum seeking (ES) algorithm to identify online the optimal evaporating temperature. Regarding safety conditions, we propose the use of the extended prediction self-adaptive control (EPSAC) approach to constrained model predictive control (MPC). Since it uses input/output models for prediction, it avoids the need for state estimators, making it a suitable tool for industrial applications. The performance of the proposed control strategy is compared to PID-like schemes. Results show that EPSAC-MPC is a more effective control strategy, as it allows a safer and more efficient operation of the ORC unit, as it can handle constraints in a natural way, operating close to the boundary conditions where power generation is maximized.

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Section: Introductionmentioning

confidence: 99%

Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control

et al. 2016

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“…Yang et al [5,6] report temperatures of up to 547˝C for engine exhaust gas and, depending on the load of the engine, up to 400 K temperature difference between the exhaust gas and the organic working fluid R461A. Zhang et al [7] also report temperature beyond 527˝C for the exhaust gas.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Preißinger

Brüggemann

2016

Energies

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“…Therein, p,exh c is the exhaust specific heat at constant pressure, which can be calculated as follows [26]:…”

Section: Exhaust Energy Of the Vehicle Diesel Enginementioning

confidence: 99%

Parametric Optimization of Regenerative Organic Rankine Cycle System for Diesel Engine Based on Particle Swarm Optimization

et al. 2015

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Abstract:To efficiently recover the waste heat from a diesel engine exhaust, a regenerative organic Rankine cycle (RORC) system was employed, and butane, R124, R416A, and R134a were used as the working fluids. The resulting diesel engine-RORC combined system was defined and the relevant evaluation indexes were proposed. First, the variation tendency of the exhaust energy rate under various diesel engine operating conditions was analyzed using experimental data. The thermodynamic model of the RORC system was established based on the first and second laws of thermodynamics, and the net power output and exergy destruction rate of the RORC system were selected as the objective functions. A particle swarm optimization (PSO) algorithm was used to optimize the operating parameters of the RORC system, including evaporating pressure, intermediate pressure, and degree of superheat. The operating performances of the RORC system and diesel engine-RORC combined system were studied for the four selected working fluids under various operating conditions of the diesel engine. The results show that the operating performances of the RORC system and the combined system using butane are optimal on the basis of optimizing the operating parameters; when the engine speed is 2200 r/min and engine torque is 1215 N·m, the net power output of the RORC OPEN ACCESSEnergies 2015, 8 9752 system using butane is 36.57 kW, and the power output increasing ratio (POIR) of the combined system using butane is 11.56%.

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Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions

Cited by 28 publications

References 32 publications

Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control

Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control

Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Parametric Optimization of Regenerative Organic Rankine Cycle System for Diesel Engine Based on Particle Swarm Optimization

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