A performance analysis of a novel system of a dual loop bottoming organic Rankine cycle (ORC) with a light-duty diesel engine

Zhang, H.G.; Wang, E.H.; Fan, Boyuan

doi:10.1016/j.apenergy.2012.09.018

Cited by 174 publications

(49 citation statements)

References 17 publications

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“…(1) The pressure drop and heat loss in the tubes are neglected; (2) The evaporating pressure varies from 1.5 MPa to 2.5 MPa; (3) The intermediate pressure varies from 0.9 MPa to 1.8 MPa; (4) The degree of superheat varies from 0 K to 10 K; (5) The isentropic efficiency of the expander is set to 0.85; (6) The heat exchange coefficient of the evaporator is set to 0.85, which is the ratio of the heat absorbed by the organic working fluids in the evaporator to the heat released by engine exhaust when passing through the evaporator; (7) The ambient temperature and condensing temperature are set to 288 K and 303 K, respectively; (8) The exhaust temperature at the outlet of the evaporator (Tout) is set to 380 K [28]. Table 3.…”

Section: Thermodynamic Modeling Of the Regenerative Organic Rankine Cmentioning

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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Section: Thermodynamic Modeling Of the Regenerative Organic Rankine Cmentioning

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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“…These efficiencies are slightly high but achievable. A high value is chosen to help analyze the potential maximum power generated by the ORC [18]. (3) The condensing temperature of the HT cycle is set to 353.15 K, and the ambient temperature is set to 291.15 K. (4) To ensure a suitable heat transfer temperature difference, the evaporating temperature of the LT cycle is set to 348.15 K because the temperature of the engine coolant in evaporator 2 is maintained at 363.15 K, and the condensing temperature of the LT cycle is set to 293.15 K. (5) A small part of the heat energy in the engine coolant can be recovered, while a large part of the heat energy dissipates into the environment [20,23]; thus, the heat transfer efficiency of evaporator 2 is set to 0.3 in the present model.…”

Section: Performance Parameters Of the Dorc Systemmentioning

confidence: 99%

“…However, previous studies have mostly focused on gasoline [17] and diesel engines [18][19][20], and only a few of these studies have been conducted for natural gas engines. Given that the development of alternative energy is a worldwide agreement, the present work is performed on a heavy-duty CNG engine platform for commercial vehicles.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine

et al. 2014

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A dual loop organic Rankine cycle (DORC) system is designed to recover waste heat from a heavy-duty compressed natural gas engine (CNGE), and the performance of the DORC-CNGE combined system is simulated and discussed. The DORC system includes high-temperature (HT) and low-temperature (LT) cycles. The HT cycle recovers energy from the exhaust gas emitted by the engine, whereas the LT cycle recovers energy from intake air, engine coolant, and the HT cycle working fluid in the preheater. The mathematical model of the system is established based on the first and second laws of thermodynamics. The characteristics of waste heat energy from the CNGE are calculated according to engine test data under various operating conditions. Moreover, the performance of the DORC-CNGE combined system is simulated and analyzed using R245fa as the working fluid. Results show that the maximum net power output and the maximum thermal efficiency of the DORC system are 29.37 kW and 10.81%, respectively, under the rated power output condition of the engine. Compared with the original CNG engine, the maximum power output increase ratio and the maximum brake specific fuel consumption improvement ratio are 33.73% and 25%, respectively, in the DORC-CNGE combined system. OPEN ACCESSEnergies 2014, 7 7795

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“…For the traditional internal combustion engine (ICE), 30-45% heat from fuel combustion is discharged into the surroundings by exhaust gas, which causes a great waste of energy and accelerates the deterioration of the environment [1][2][3]. One of the best solutions for these problems is to recover waste heat contained in exhaust gas.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Thermoelectric Based Automotive Waste Heat Recovery System with Nanofluid Coolant

Chen

2017

Energies

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Output performance of a thermoelectric-based automotive waste heat recovery system with a nanofluid coolant is analyzed in this study. Comparison between Cu-Ethylene glycol (Cu-EG) nanofluid coolant and ethylene glycol with water (EG-W) coolant under equal mass flow rate indicates that Cu-EG nanofluid as a coolant can effectively improve power output and thermoelectric conversion efficiency for the system. Power output enhancement for a 3% concentration of nanofluid is 2.5-8 W (12.65-13.95%) compared to EG-Water when inlet temperature of exhaust varies within 500-710 K. The increase of nanofluid concentration within a realizable range (6%) has positive effect on output performance of the system. Study on the relationship between total area of thermoelectric modules (TEMs) and output performance of the system indicates that optimal total area of TEMs exists for maximizing output performance of the system. Cu-EG nanofluid as coolant can decrease optimal total area of TEMs compared with EG-W, which will bring significant advantages for the optimization and arrangement of TEMs whether the system space is sufficient or not. Moreover, power output enhancement under Cu-EG nanofluid coolant is larger than that of EG-W coolant due to the increase of hot side heat transfer coefficient of TEMs.

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A performance analysis of a novel system of a dual loop bottoming organic Rankine cycle (ORC) with a light-duty diesel engine

Cited by 174 publications

References 17 publications

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

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

Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine

Performance Analysis of Thermoelectric Based Automotive Waste Heat Recovery System with Nanofluid Coolant

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