The Experts below are selected from a list of 306522 Experts worldwide ranked by ideXlab platform
Jinfu Yang - One of the best experts on this subject based on the ideXlab platform.
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thermoEconomic comparison between pure and mixture working fluids of organic rankine cycles orcs for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T-7 = T-E, T-3 = T-C) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2,3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1. (C) 2015 Elsevier Ltd. All rights reserved.
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sensitivity analysis and thermoEconomic comparison of orcs organic rankine cycles for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Yaning Zhang, Jinfu Yang, Yang ShiAbstract:Abstract The sensitivity analysis for low temperature ORCs (organic Rankine cycles), as well as the thermoEconomic comparison between the basic ORC and regenerative ORC using Non-dominated sorting genetic algorithm-II (NSGA-II), are conducted in this paper. The derivatives of five system parameters on system performance are used to evaluate the parametric sensitiveness. The exergy efficiency and the APR (heat exchanger area per unit net power output) are selected as the objective functions for multi-objective optimization using R123 under the low temperature heat source of 423 K. The Pareto frontier solution with bi-objective for maximizing exergy efficiency and minimizing APR is obtained and compared with the corresponding single-objective solutions. The results indicate that the prior consideration of improving thermal efficiency and exergy efficiency is to increase the evaporator outlet temperature. A fitting curve can be yielded from the Pareto frontier between the thermodynamic performance and Economic Factor. The optimum exergy efficiency and APR of the regenerative ORC obtained from the Pareto-optimal solution are 59.93% and 3.07 m2/kW, which are 8.10% higher and 15.89% lower than that of the basic ORC, respectively. The Pareto optimization compromises the thermodynamic performance and Economic Factor, therefore being more suitable for decision making.
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ThermoEconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T7=TE,T3=TC) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2, 3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1.
Yongqiang Feng - One of the best experts on this subject based on the ideXlab platform.
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thermoEconomic comparison between pure and mixture working fluids of organic rankine cycles orcs for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T-7 = T-E, T-3 = T-C) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2,3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1. (C) 2015 Elsevier Ltd. All rights reserved.
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sensitivity analysis and thermoEconomic comparison of orcs organic rankine cycles for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Yaning Zhang, Jinfu Yang, Yang ShiAbstract:Abstract The sensitivity analysis for low temperature ORCs (organic Rankine cycles), as well as the thermoEconomic comparison between the basic ORC and regenerative ORC using Non-dominated sorting genetic algorithm-II (NSGA-II), are conducted in this paper. The derivatives of five system parameters on system performance are used to evaluate the parametric sensitiveness. The exergy efficiency and the APR (heat exchanger area per unit net power output) are selected as the objective functions for multi-objective optimization using R123 under the low temperature heat source of 423 K. The Pareto frontier solution with bi-objective for maximizing exergy efficiency and minimizing APR is obtained and compared with the corresponding single-objective solutions. The results indicate that the prior consideration of improving thermal efficiency and exergy efficiency is to increase the evaporator outlet temperature. A fitting curve can be yielded from the Pareto frontier between the thermodynamic performance and Economic Factor. The optimum exergy efficiency and APR of the regenerative ORC obtained from the Pareto-optimal solution are 59.93% and 3.07 m2/kW, which are 8.10% higher and 15.89% lower than that of the basic ORC, respectively. The Pareto optimization compromises the thermodynamic performance and Economic Factor, therefore being more suitable for decision making.
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ThermoEconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T7=TE,T3=TC) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2, 3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1.
Yaning Zhang - One of the best experts on this subject based on the ideXlab platform.
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thermoEconomic comparison between pure and mixture working fluids of organic rankine cycles orcs for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T-7 = T-E, T-3 = T-C) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2,3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1. (C) 2015 Elsevier Ltd. All rights reserved.
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sensitivity analysis and thermoEconomic comparison of orcs organic rankine cycles for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Yaning Zhang, Jinfu Yang, Yang ShiAbstract:Abstract The sensitivity analysis for low temperature ORCs (organic Rankine cycles), as well as the thermoEconomic comparison between the basic ORC and regenerative ORC using Non-dominated sorting genetic algorithm-II (NSGA-II), are conducted in this paper. The derivatives of five system parameters on system performance are used to evaluate the parametric sensitiveness. The exergy efficiency and the APR (heat exchanger area per unit net power output) are selected as the objective functions for multi-objective optimization using R123 under the low temperature heat source of 423 K. The Pareto frontier solution with bi-objective for maximizing exergy efficiency and minimizing APR is obtained and compared with the corresponding single-objective solutions. The results indicate that the prior consideration of improving thermal efficiency and exergy efficiency is to increase the evaporator outlet temperature. A fitting curve can be yielded from the Pareto frontier between the thermodynamic performance and Economic Factor. The optimum exergy efficiency and APR of the regenerative ORC obtained from the Pareto-optimal solution are 59.93% and 3.07 m2/kW, which are 8.10% higher and 15.89% lower than that of the basic ORC, respectively. The Pareto optimization compromises the thermodynamic performance and Economic Factor, therefore being more suitable for decision making.
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ThermoEconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T7=TE,T3=TC) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2, 3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1.
Tzu-chen Hung - One of the best experts on this subject based on the ideXlab platform.
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thermoEconomic comparison between pure and mixture working fluids of organic rankine cycles orcs for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T-7 = T-E, T-3 = T-C) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2,3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1. (C) 2015 Elsevier Ltd. All rights reserved.
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ThermoEconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T7=TE,T3=TC) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2, 3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1.
Bingxi Li - One of the best experts on this subject based on the ideXlab platform.
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thermoEconomic comparison between pure and mixture working fluids of organic rankine cycles orcs for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T-7 = T-E, T-3 = T-C) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2,3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1. (C) 2015 Elsevier Ltd. All rights reserved.
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ThermoEconomic comparison between pure and mixture working fluids of organic Rankine cycles (ORCs) for low temperature waste heat recovery
2015Co-Authors: Yongqiang Feng, Kowalski Greg, Bingxi Li, Yaning Zhang, Tzu-chen Hung, Jinfu YangAbstract:Based on the thermoEconomic multi-objective optimization, simultaneously considering exergy efficiency and levelized energy cost (LEC), the thermoEconomic comparisons between pure and mixture working fluids of organic Rankine cycles (ORCs) have been investigated. Four models are proposed based on the different location of evaporating bubble point temperature or condensing dew point temperature for mixture working fluids. The effects of mass fraction and four key parameters (evaporator temperature, condenser temperature, pinch point temperature difference and degree of superheat) on exergy efficiency and levelized energy cost (LEC) are examined. Pareto-optimal solutions of four models using 0.7R245fa/0.3R227ea are obtained and compared. Taking mass fraction into account, the thermoEconomic comparisons between pure and mixture working fluids have been studied. Research demonstrates that the mixtures don't always present better thermodynamic performance and Economic performance than pure working fluids. Model 2 (T7=TE,T3=TC) is the favorable operation condition for its highest thermodynamic performance and relatively low Economic Factor. Taking mass fraction as decision variable, Pareto-optimal solutions for models 1, 2, 3 and 4 in pairs of (exergy efficiency (%), LEC ($/kW h)) are (56.71, 0.188), (57.67, 0.192), (57.11, 0.194), and (56.91, 0.192), respectively. Compared with pure working fluids, the mixture working fluids present better exergy efficiency but worse LEC except model 1.
