The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Lijun Yu - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of the combined supercritical co2 recompression and Regenerative Cycle used in waste heat recovery of marine gas turbine
Energy Conversion and Management, 2017Co-Authors: Yuandan Wu, Yaodong Zhou, Lijun YuAbstract:Abstract With the aim to recover the marine gas turbine exhaust heat, and improve the ship part-load thermal efficiency, a combined Cycle coupling supercritical CO2 recompression and Regenerative Cycle is proposed. The proposed system adopts modular design. The application process can choose the module according to the ship's need. The Cycle parameters, including the output power, exergy efficiency, the heat exchanger area per unit power output (APR) and the levelized energy cost (LEC), have been analyzed and optimized. The multi-objective optimization method based on genetic algorithm is selected as the optimization method to obtain the optimum system parameter. From the viewpoints of the output power, compactness and economics, the obtained result reveals the superiority of the proposed Cycle compared to the common supercritical CO2 recompression Cycle, the common supercritical CO2 Regenerative Cycle and the combined Cycle coupling two supercritical CO2 Regenerative Cycle. What’s more, the proposed system can effectively improve the part-load performance of the ship. When the gas turbine fails, the combined Cycle could meet 80% propulsion power of the ship by enabling the second combustion chamber, which could be used as the backup generator and improve the safety of the ship operation. The proposed Cycle is suitable for marine gas turbine waste heat recovery, it has advantages of deep utilization of waste heat, high compactness and low cost.
Yaodong Zhou - One of the best experts on this subject based on the ideXlab platform.
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optimization of the combined supercritical co2 Cycle and organic rankine Cycle using zeotropic mixtures for gas turbine waste heat recovery
Energy Conversion and Management, 2018Co-Authors: Shengya Hou, Yaodong Zhou, Fengyuan Zhang, Sheng CaoAbstract:Abstract In order to further improve the efficiency of the gas turbine, a novel combined supercritical CO2 Regenerative Cycle and organic Rankine Cycle using zeotropic mixtures for waste heat recovery of gas turbine is proposed. The zeotropic mixtures used in the present study are cyclopentane/R365mfc. Exergoeconomic analysis is reported for the proposed system and parametric studies have been carried out to investigate the effect of system parameters on the exergy efficiency and the unit cost of electricity. The multi-objective optimization method based on genetic algorithm is chosen to obtain the optimum system parameters. The results show that the overall values of the exergoeconomic factor, the optimal exergy efficiency and the optimal unit cost of electricity of the proposed system are 31.88%, 62.23% and 3.95 cent/kW h, respectively. The obtained result reveals the superiority of the proposed combined Regenerative S-CO2 Cycle and ORC system compared to the combined basic S-CO2 Cycle and ORC system, the combined recompression S-CO2 Cycle and ORC system. Therefore, the proposed system is suitable for gas turbine waste heat recovery, and it has advantages of deep utilization of waste heat, high efficiency and low cost.
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performance analysis of the combined supercritical co2 recompression and Regenerative Cycle used in waste heat recovery of marine gas turbine
Energy Conversion and Management, 2017Co-Authors: Yuandan Wu, Yaodong Zhou, Lijun YuAbstract:Abstract With the aim to recover the marine gas turbine exhaust heat, and improve the ship part-load thermal efficiency, a combined Cycle coupling supercritical CO2 recompression and Regenerative Cycle is proposed. The proposed system adopts modular design. The application process can choose the module according to the ship's need. The Cycle parameters, including the output power, exergy efficiency, the heat exchanger area per unit power output (APR) and the levelized energy cost (LEC), have been analyzed and optimized. The multi-objective optimization method based on genetic algorithm is selected as the optimization method to obtain the optimum system parameter. From the viewpoints of the output power, compactness and economics, the obtained result reveals the superiority of the proposed Cycle compared to the common supercritical CO2 recompression Cycle, the common supercritical CO2 Regenerative Cycle and the combined Cycle coupling two supercritical CO2 Regenerative Cycle. What’s more, the proposed system can effectively improve the part-load performance of the ship. When the gas turbine fails, the combined Cycle could meet 80% propulsion power of the ship by enabling the second combustion chamber, which could be used as the backup generator and improve the safety of the ship operation. The proposed Cycle is suitable for marine gas turbine waste heat recovery, it has advantages of deep utilization of waste heat, high compactness and low cost.
Changlu Zhao - One of the best experts on this subject based on the ideXlab platform.
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Thermo-economic analysis of transcritical CO2 power Cycle and comparison with Kalina Cycle and ORC for a low-temperature heat source
Energy Conversion and Management, 2019Co-Authors: Fanxiao Meng, Fujun Zhang, Enhua Wang, Bo Zhang, Changlu ZhaoAbstract:Abstract The utilization of low-temperature heat energy can improve energy conservation and protect the environment effectively. A transcritical CO2 power Cycle is normally considered not competent with an organic Rankine Cycle (ORC) for low-temperature applications. In this study, the advantages of transcritical CO2 power Cycle for low-temperature heat sources are explored from a thermo-economic viewpoint. The performances of four different transcritical CO2 power Cycles are evaluated theoretically and then compared with an ORC and a Kalina Cycle. First, a mathematical model is established to estimate the thermodynamic and economic performances of the power Cycles including a basic Cycle, a recuperated Cycle, a Regenerative Cycle with an open-feed heater, and a Cycle with a reheater. Printed circuit heat exchangers are used for the evaporators and air-cooled heat exchangers are adopted for the condensers. Aspen EDR is used to obtain the areas of the air-cooled condensers and the overall thermo-economic performance is determined by Matlab. Then, one suitable Cycle is selected and compared with the ORC and the Kalina Cycle for a low-temperature heat source. The results indicate that the Cycle with a reheater is preferable among the four transcritical CO2 Cycles. Compared with the ORC and the Kalina Cycle, the net power output of the transcritical CO2 Cycle is the largest and the economic performance is between the Kalina Cycle and the ORC. However, CO2 is cheaper, more environmentally-friendly, and safer than organic fluids. Therefore, from a thermo-economic viewpoint, transcritical CO2 power Cycle is competent with ORC for low-temperature heat sources.
Yuandan Wu - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of the combined supercritical co2 recompression and Regenerative Cycle used in waste heat recovery of marine gas turbine
Energy Conversion and Management, 2017Co-Authors: Yuandan Wu, Yaodong Zhou, Lijun YuAbstract:Abstract With the aim to recover the marine gas turbine exhaust heat, and improve the ship part-load thermal efficiency, a combined Cycle coupling supercritical CO2 recompression and Regenerative Cycle is proposed. The proposed system adopts modular design. The application process can choose the module according to the ship's need. The Cycle parameters, including the output power, exergy efficiency, the heat exchanger area per unit power output (APR) and the levelized energy cost (LEC), have been analyzed and optimized. The multi-objective optimization method based on genetic algorithm is selected as the optimization method to obtain the optimum system parameter. From the viewpoints of the output power, compactness and economics, the obtained result reveals the superiority of the proposed Cycle compared to the common supercritical CO2 recompression Cycle, the common supercritical CO2 Regenerative Cycle and the combined Cycle coupling two supercritical CO2 Regenerative Cycle. What’s more, the proposed system can effectively improve the part-load performance of the ship. When the gas turbine fails, the combined Cycle could meet 80% propulsion power of the ship by enabling the second combustion chamber, which could be used as the backup generator and improve the safety of the ship operation. The proposed Cycle is suitable for marine gas turbine waste heat recovery, it has advantages of deep utilization of waste heat, high compactness and low cost.
Rizwan Ahmed Memon - One of the best experts on this subject based on the ideXlab platform.
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thermo environmental and economic analysis of simple and Regenerative gas turbine Cycles with regression modeling and optimization
Energy Conversion and Management, 2013Co-Authors: Abdul Ghafoor Memon, Khanji Harijan, Mohammad Aslam Uqaili, Rizwan Ahmed MemonAbstract:Abstract In this paper, thermo-environmental, economic and regression analyses of simple and Regenerative gas turbine Cycles are exhibited. Firstly, thermodynamic models for both Cycles are defined; exergy destruction rate of different components is determined and parametric study is carried out to investigate the effects of compressor inlet temperature, turbine inlet temperature and compressor pressure ratio on the parameters that measure Cycles’ performance, environmental impact and costs. Subsequently, multiple polynomial regression (MPR) models are developed to correlate important response variables with predictor variables and finally optimization is performed for optimal operating conditions. The results of parametric study have shown a significant impact of operating parameters on the performance parameters, environmental impact and costs. According to exergy analysis, the combustion chamber and exhaust stack are two major sites where largest exergy destruction/losses occur. Also, the total exergy destruction in the Regenerative Cycle is relatively lower; thereby resulted in a higher exergy efficiency of the Cycle. The MPR models are also appeared as good estimator of the response variables since appended with very high R 2 values. Finally, these models are used to determine the optimal operating parameters, which maximize the Cycles’ performance and minimize CO 2 emissions and costs.