Optimized performances comparison of organic Rankine cycles for low grade waste heat recovery

Wang, Enhua; Zhang, Honggang; Fan, Boyuan; Wu, Yuting

doi:10.1007/s12206-012-0603-4

Cited by 60 publications

(26 citation statements)

References 10 publications

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“…The exponent is 0.4 for heating while 0.3 for cooling because of the variation of viscosity with temperature. In the two-phase zone, the evaporation heat transfer process between refrigerant and tube wall is modeled by Kandlikar correlation as Equations (15) and (16) [43]:…”

Section: Heat Transfer Coefficient Of the Refrigerant In Condensermentioning

confidence: 99%

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Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

et al. 2017

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Abstract:The organic Rankine cycle (ORC) can be used to recover the waste heat from a stationary compressed natural gas (CNG) engine. However, the exhaust energy rate varies with engine load, which can influence the operating performance of the ORC system, therefore, it is necessary to study the running state of the ORC system. In this paper, first, the numerical simulation model of the ORC system is built by using GT-Suite software, with R245fa selected as the working fluid of the ORC system. The boundary conditions of the numerical simulation model are specified according to the measured data obtained by the stationary CNG engine test. Subsequently, the power output and dynamic characteristics of expander are analyzed to determine the running state of the ORC system. Investigations indicate that the fluctuation of refrigerant mass flow rate in the expander is obvious in the engine's low-load regions (from 20% engine load to 40% engine load). The performances of ORC system and stationary CNG engine-ORC combined system (combined system) are finally investigated, respectively. The results show that the thermal efficiency of the combined system can be increased by a maximum 5.0% (at the engine rated condition), while the brake specific fuel consumption (BSFC) can be reduced by a maximum 4.0% (at the engine rated condition).

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Section: Heat Transfer Coefficient Of the Refrigerant In Condensermentioning

confidence: 99%

“…Therefore, some scholars comparatively analyzed the running performances of different system configurations. Wang et al [16] evaluated the performances of five different types of ORC system. These configurations include a simple ORC, an ORC with an IHE, an ORC with an OFOH, an ORC with a CFOH, and an ORC with a reheater.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

et al. 2017

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“…The organic Rankine cycle (ORC) is an effective method for waste heat recovery, and has been widely studied and applied in many domains [3][4][5][6][7][8]. Katsanos et al [9] conducted a theoretical study to analyze the performance of a heavy-duty truck diesel engine equipped with a Rankine bottoming cycle used for recovering waste heat from the exhaust gas.…”

Section: Introductionmentioning

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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“…Clemente et al [21] defined an ORC system to recover heat from a commercial gas turbine with recuperator. Wang et al [22] evaluated five different types of ORC, and their analysis indicated that the ORC with recuperator possesses the best thermodynamic performance. From the previously mentioned analysis, we can conclude that the running performance of the ORC system can be improved when a zeotropic mixture is used as working fluid or when an internal heat exchanger (IHE) is used.…”

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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Optimized performances comparison of organic Rankine cycles for low grade waste heat recovery

Cited by 60 publications

References 10 publications

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

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

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

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