A Study of Power Generation from Combined Wind and Solar Energy

• Main Authors: You, Siang-Lin, 游象麟
• Other Authors: Lin, Tsing-Fa
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/25061130120258369338

碩士 === 國立交通大學 === 機械工程學系 === 99 === In this study an experiment is carried out to investigate the feasibility of a small-scale power generation system from combined solar and wind energy. A model test loop is established basically in the form of a two-phase closed loop thermosyphon. Effects of the input power (vapor speed), cooling water temperature in the condenser, liquid fill ratio in the evaporator and relative elevation between the condenser and evaporator for solar power and effects of the wind speed from simulated wind source for wind power are examined in detail. Besides, how the output electric power and electric power generation efficiency affected by interaction of the combined energy sources are inspected. FC-72 dielectric liquid is selected as the working fluid. Tests are conducted for the cooling water temperature in the condenser varied from 10 to 30 ,℃℃ liquid fill ratio in the evaporator from 60 % to 80 %, condenser-evaporator relative elevation from 10 to 15 cm, the wind speed from a cut-in velocity to 10 m/s, and the vapor speed from a cut-in velocity to 12 m/s. The obtained experimental data for the power generation from the wind energy show that the output electric power increases approximately linearly with the wind speed. An empirical correlation is proposed to delineate the relationship between the output power and wind speed. For the power generation from the solar energy only, an increase for the cooling water temperature in the condenser significantly raises the output electric power and electric power generation efficiency. Higher liquid fill ratio in the evaporator results in better power generation performance. However, an optimal liquid fill ratio exists. For the ratio of 80 %, the output electric power and electric power generation efficiency are significantly improved. The power generation performance depends only slightly on the relative elevation between the condenser and evaporator for most experimental cases. We also note that the total power output and the electric power generation efficiency from the combined energy sources are noticeably higher than the total of that generated from the individual energy sources. The cooling water temperature in the condenser considerably influences the power generation performance only at low wind speed.