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In this study, two schemes of solar electrical power generation are designed and compared according to solar collection area minimization. The one comprises the parabolic trough collector, dual-tank of molten salt heat storage, and Organic Rankine cycle. The other consists of photovoltaic cell, polymer electrolyte membrane water electrolyzer, and polymer electrolyte membrane fuel cell. The effects of irradiation value, environmental temperature, and energy storage type on thermodynamic performance were investigated. The results indicated that the solar irradiation value had a more obvious effect on the PV (photovoltaic) cell performance than environmental temperature, and the PTC (parabolic trough concentrator) performance was improved with the increases of solar irradiation value and environmental temperature. The environmental temperature effect was negligible; however, the influence of irradiation value was obvious. Irradiation value had a positive effect on the former system, whereas it demonstrated the opposite for the latter. The latter system had much lower efficiency than the former, due to the low conversion efficiency between hydrogen energy and electrical energy in the polymer electrolyte membrane water electrolyzer and fuel cell. Stated thus, the latter system is appropriate for the power generation system with non-energy storage, and the former system is promising in the power generation system with energy storage.
Junfen Li; Hang Guo; Qingpeng Meng; Yuting Wu; Fang Ye; Chongfang Ma. Thermodynamic Analysis and Comparison of Two Small-Scale Solar Electrical Power Generation Systems. Sustainability 2020, 12, 10268 .
AMA StyleJunfen Li, Hang Guo, Qingpeng Meng, Yuting Wu, Fang Ye, Chongfang Ma. Thermodynamic Analysis and Comparison of Two Small-Scale Solar Electrical Power Generation Systems. Sustainability. 2020; 12 (24):10268.
Chicago/Turabian StyleJunfen Li; Hang Guo; Qingpeng Meng; Yuting Wu; Fang Ye; Chongfang Ma. 2020. "Thermodynamic Analysis and Comparison of Two Small-Scale Solar Electrical Power Generation Systems." Sustainability 12, no. 24: 10268.
Solar thermal electricity generating technology is an alternative solution to energy crises and environmental problems, which has caused wide concern in recent decades. In this paper, a molten salt parabolic trough‐based concentrated organic Rankine cycle system is proposed and investigated. A quadribasic nitrate salt with low melting temperature is employed as a heat transfer and storage medium. A stable heat transfer and economic model is established with Matlab. The radial and axial temperature distributions in the collector tube are obtained, and the impact of condensation and evaporation temperatures on the heat transfer area is analyzed. Results show that the temperature along the axial direction linearly increases, and the temperature at the collector tube exit decreases with the increase of molten salt mass flow rate. The maximum temperature difference along the radial direction of the collector tube happens in the annular gap. Heat transfer and thermodymanic analysis indicates that condensation temperature has a more evident effect on heat transfer area than that of evaporation temperature. An increase in condensation temperature leads to a decrease in the evaporator area, the condenser area increases, and the total area decreases. Economic analysis indicates the collector cost plays a predominant role in total capital costs, and decreasing molten salt mass flow rate can considerably reduce collector cost. Levelized energy cost sensitivity analysis indicated that operation time per year has a more evident effect than that of the four factors. Heat transfer and economic analysis on the system helps in the selection of operation parameters.
Jun Fen Li; Hang Guo; Qing Peng Meng; Yu Ting Wu; Fang Ye; Chong Fang Ma. Thermoeconomic analysis on a molten salt parabolic trough‐based concentrated solar organic Rankine cycle system. International Journal of Energy Research 2020, 44, 3395 -3411.
AMA StyleJun Fen Li, Hang Guo, Qing Peng Meng, Yu Ting Wu, Fang Ye, Chong Fang Ma. Thermoeconomic analysis on a molten salt parabolic trough‐based concentrated solar organic Rankine cycle system. International Journal of Energy Research. 2020; 44 (5):3395-3411.
Chicago/Turabian StyleJun Fen Li; Hang Guo; Qing Peng Meng; Yu Ting Wu; Fang Ye; Chong Fang Ma. 2020. "Thermoeconomic analysis on a molten salt parabolic trough‐based concentrated solar organic Rankine cycle system." International Journal of Energy Research 44, no. 5: 3395-3411.
The efficiencies of single screw expander and multi-stage centrifugal pump are obtained by fitting experimental data, and which substitute the constant efficiencies of the expander and the pump in most researches. Modelling analysis of four configurations of organic Rankine cycle system (conventional organic Rankine cycle, organic Rankine cycle with a regenerator, extraction organic Rankine cycle and extraction organic Rankine cycle with a regenerator) is conducted, the effects of evaporation pressure and condensation temperature on the thermal efficiency of different cycle configurations are investigated and compared. Extraction pressure and extraction ratio are introduced to analyze the thermal efficiency of the latter two cycle configurations. Result shows that the extraction organic Rankine cycle with a regenerator has the highest thermal efficiency at the same operation condition; evaporation pressure has a positive effect on the thermal efficiency, while condensation temperature has a negative effect under a certain range. This study can provide a reference for the selection of the cycle configuration and design of operation parameters for a given system.
Jun Fen Li; Hang Guo; Biao Lei; Yu Ting Wu; Fang Ye; Chong Fang Ma. Thermodynamic Performance Analysis on Various Configurations of Organic Rankine Cycle Systems. Mechanical Engineering and Materials 2019, 439 -446.
AMA StyleJun Fen Li, Hang Guo, Biao Lei, Yu Ting Wu, Fang Ye, Chong Fang Ma. Thermodynamic Performance Analysis on Various Configurations of Organic Rankine Cycle Systems. Mechanical Engineering and Materials. 2019; ():439-446.
Chicago/Turabian StyleJun Fen Li; Hang Guo; Biao Lei; Yu Ting Wu; Fang Ye; Chong Fang Ma. 2019. "Thermodynamic Performance Analysis on Various Configurations of Organic Rankine Cycle Systems." Mechanical Engineering and Materials , no. : 439-446.