Linear Active Disturbance Rejection Control of Waste Heat Recovery Systems with Organic Rankine Cycles

Zhang, Jianhua; Feng, Jiancun; Zhou, Yeli; Fang, Fang; Yue, Hong

doi:10.3390/en5125111

Cited by 28 publications

(26 citation statements)

References 24 publications

(26 reference statements)

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“…Similarly, disturbance rejection scenarios were investigated associated with hot gas stream velocity variation and throttle valve dynamics. Zhang et al [99] extended the previous work by developing an extended observer that aims to provide accurate state estimates for the system.…”

Section: Control Approachesmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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Efficient power generation from low to medium grade heat is an important challenge to be addressed to ensure a sustainable energy future. Organic Rankine Cycles (ORCs) constitute an important enabling technology and their research and development has emerged as a very active research field over the past decade. Particular focus areas include working fluid selection and cycle design to achieve efficient heat to power conversions for diverse hot fluid streams associated with geothermal, solar or waste heat sources. Recently, a number of approaches have been developed that address the systematic selection of efficient working fluids as well as the design, integration and control of ORCs. This paper presents a review of emerging approaches with a particular emphasis on computer-aided design methods.

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Section: Control Approachesmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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“…PPTD between the diesel engine exhaust and zeotropic mixture R416A is set to 10 K. The PPTD occurrence position is first assumed to appear at the inlet of the evaporator of the zeotropic mixture side (State Point 3 in Figure 2), which indicates that the difference between T exh_out and T 3 is 10 K. T 4 is the temperature of the zeotropic mixture R416A at the outlet of the evaporator of the zeotropic mixture side, T exh_in can be measured during the engine test, and T 4 can be determined when the evaporating pressure and degree of superheat are certain (in this paper, "certain" means "be held constant", the same as below), such that the difference between T exh_in and T 4 can be calculated. T exh_e can be calculated using Equation (1), where T b is the bubble temperature of the zeotropic mixture R416A in the saturated liquid state, such that the difference between T exh_e and T b can be calculated. The occurrence position of PPTD between diesel engine exhaust and zeotropic mixture R416A can be determined by comparing the values of the above-mentioned three temperature difference: The evaporator and condenser are mainly responsible for the exergy destruction rate ( I  ) of the ORC waste heat recovery system; exergy destruction rate is mainly caused by the temperature difference of the heat transfer between the hot and cold fluids.…”

Section: Description and Modeling Of The Orc Waste Heat Recovery Systemmentioning

confidence: 99%

“…The organic Rankine cycle (ORC) system is an effective and promising method for converting waste heat into useful work, and has been widely studied and applied in many domains [1][2][3][4][5]. Li et al [6] analyzed the performance of ORC in recovering low-temperature waste heat from flue gas.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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This study analyzed the variation law of engine exhaust energy under various operating conditions to improve the thermal efficiency and fuel economy of diesel engines. An organic Rankine cycle (ORC) waste heat recovery system with internal heat exchanger (IHE) was designed to recover waste heat from the diesel engine exhaust. The zeotropic mixture R416A was used as the working fluid for the ORC. Three evaluation indexes were presented as follows: waste heat recovery efficiency (WHRE), engine thermal efficiency increasing ratio (ETEIR), and output energy density of working fluid (OEDWF). In terms of various operating conditions of the diesel engine, this study investigated the variation tendencies of the running performances of the ORC waste heat recovery system and the effects of the degree of superheat on the running performance of the ORC waste heat recovery system through theoretical calculations. The research findings showed that the net power output, WHRE, and ETEIR of the ORC waste heat recovery system reach their maxima when the degree of superheat is 40 K, engine speed is 2200 r/min, and engine torque is 1200 N·m. OEDWF gradually increases with the increase in the degree of superheat, OPEN ACCESSEnergies 2014, 7 2124 which indicates that the required mass flow rate of R416A decreases for a certain net power output, thereby significantly decreasing the risk of environmental pollution.

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“…The organic Rankine cycle (ORC) system is considered effective in converting low-grade waste heat to useful work and has recently been widely studied and applied in many domains [4][5][6][7]. Wang et al [8] established an off-design model of an ORC system driven by solar energy.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the Vehicle Diesel Engine-ORC Combined System Based on a Screw Expander

et al. 2014

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To achieve energy saving and emission reduction for vehicle diesel engines, the organic Rankine cycle (ORC) was employed to recover waste heat from vehicle diesel engines, R245fa was used as ORC working fluid, and the resulting vehicle diesel engine-ORC combined system was presented. The variation law of engine exhaust energy rate under various operating conditions was obtained, and the running performances of the screw expander were introduced. Based on thermodynamic models and theoretical calculations, the running performance of the vehicle diesel engine-ORC combined system was analyzed under various engine operating condition scenarios. Four evaluation indexes were defined: engine thermal efficiency increasing ratio (ETEIR), waste heat recovery efficiency (WHRE), brake specific fuel consumption (BSFC) of the combined system, and improvement ratio of BSFC (IRBSFC). Results showed that when the diesel engine speed is 2200 r/min and diesel engine torque is 1200 N·m, the power output of the combined system reaches its maximum of approximately 308.6 kW, which is 28.6 kW higher than that of the diesel engine. ETEIR, WHRE, and IRBSFC all reach their maxima at 10.25%, 9.90%, and 9.30%, respectively. Compared with that of the diesel engine, the BSFC of the combined system is obviously improved under various engine operating conditions. OPEN ACCESSEnergies 2014, 7 3401

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Linear Active Disturbance Rejection Control of Waste Heat Recovery Systems with Organic Rankine Cycles

Cited by 28 publications

References 24 publications

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

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

Performance Analysis of the Vehicle Diesel Engine-ORC Combined System Based on a Screw Expander

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