查看更多>>摘要：Molten salts have been used in solar thermal energy storage due to their high energy storage density, low cost and excellent chemical stability. However, their application is limited by "bad days" such as cloudy days and winter because the weak concentrated solar radiation cannot melt the salt. The current study indicates that through mixing pure salts, the melting point of molten salt can be decreased significantly while the latent heat is not impaired. This is very important for solar thermal energy storage systems on "bad days" because the system using the low-melting-point salt is still possible to work on these days. The case study was performed in Nottingham, the United Kingdom and Dezhou, China respectively. The pure salt and salt mixture were used as the heat transfer fluid and energy storage medium in the solar tower power plant. It is found that by using the low melting-point salt eutectic, the yearly operation time of the plant is increased by 75 days for Dezhou and 33 days for Nottingham. In addition, a molecular simulation was performed to reveal the mechanism underlying the component-dependent thermal properties. Mixing pure salts is proved to be a simple method to improve the utilization efficiency of the solar power plant.
Lim, Ji HwanPark, MinkyuShin, Seong MinChung, Seong Seok...
21页
查看更多>>摘要：In present paper, onset of nucleate boiling (ONB) of one-side heated hypervapotron (HV) channel was studied. Through sub-cooled flow boiling experiments under the conditions of a pressure of 1-10 bar, a mass flow rate of 0.071-0.284 kg/s, an inelt fluid temperature of 40-140 ?, and a heat flux of up to 10765 kW/m(2), ONB heat flux was experimentally explored. As a result, the HV channel recorded an average 186.91% improvement in ONB heat flux compared to the flat channel due to the vortex secondary flow induced by the fin structure arrangement. In addition, the effect of the system parameters on the ONB heat flux of the HV channel was analyzed. In addition, it was evaluated how well the existing ONB correlations predict the ONB of the HV channel under one side high heat load conditions. Unfortunately, they tend to under-predict the enhanced ONB of the HV channel because they are correlations developed for the circular smooth channel. Therefore, the authors of this study developed a new correlation using a Python code grafted with machine learning technology.
NSTL
Elsevier