等离激元Au纳米流体集热器性能研究

The control volume method is used to numerically solve the temperature distribution in the solar collector and to investigate the performance of a two-dimensional solar collector with Au nanofluids. The average temperature of collector outlet is taken as the measurement standard of temperature rise. The main factors affecting the temperature rise and efficiency of the collector are analyzed. The results show that the spectral intensity of the collector decreases greatly at the wavelength of Au plasmon resonance (about 500 nm), which proves that the effect of metal surface plasmon resonance can greatly enhance the spectral absorption characteristics, and that the degree of spectral radiation absorption in the collector affects the temperature distribution of the collector, thus affecting the temperature rise and efficiency of the collector; the efficiency of the collector is only 39.99% when pure water is used as the working fluid. Adding Au nanoparticles has higher collector efficiency than adding Ag nanoparticles, and the efficiency reaches 78.75%; the fluid velocity mainly affects the collector temperature rise, and the collector height mainly affects the collector efficiency. When the flow velocity is 0.1 m/s, the maximum collector temperature rise of 36.63℃ is obtained, and when the collector height is 2.5 cm, the maximum collector efficiency of 82.98% is reached; particle size and collector length have little effect on the collector temperature rise and efficiency.