11月24日，Elsevier 旗下国际著名期刊《Renewable Energy》在线发表了云南师范大学能源与环境科学学院高文峰教授课题组的最新研究成果《Performance analysis of V-corrugated flat plate collector containing binary crystal thermal storage materials》。云南师范大学能源与环境科学学院高文峰教授通讯作者。

https://www.sciencedirect.com/science/article/pii/S0960148123016208

Abstract

Flat plate solar air collectors can further increase their overall thermal conductivity and heat storage capacity by using phase change materials (PCM) and refining their structural design, which will increase their stability and effectiveness of heat collection. Based on sodium sulfate decahydrate (SSD, Na2SO4·10H2O) and sodium acetate trihydrate (SAT, CH3COONa·3H2O), this research proposes a novel manufacturing procedure to manufacture a new binary mixed hydrated salt (SSD/SAT), which addresses phase separation and undercooling difficulties.The latent heat of phase transition hits 229 J/g−1 when the material's phase transition temperature is 61.71 °C. Furthermore, the numerical modeling of the SSD/SAT material's heat collection performance was conducted when it was integrated into a V-corrugated flat plate solar collector (VC-FPSC). The collector has been found to be able to extend the heat and boost the efficiency.

11月24日，Elsevier 旗下国际著名期刊《Renewable Energy》在线发表了云南师范大学能源与环境科学学院季旭教授课题组的最新研究成果《Performance analysis of V-corrugated flat plate collector containing binary crystal thermal storage materials》。云南师范大学能源与环境科学学院季旭教授通讯作者。

https://www.sciencedirect.com/science/article/pii/S0960148123016245

Abstract

This paper employs the compound parabolic concentrator to heat the thermal conduction oil as working fluid to a higher temperature. The feed water is sprayed and obtains heat from the working fluid in evaporation chamber. The spraying of feed water enhances heat and mass transfer and increases the vaporization intensity. The latent heat of steam is recovered to preheat the feed water which improves energy utilization. Multivariate orthogonal experiments were conducted to obtain the optimized nozzle arrangement in the evaporation chamber. Numerical simulations were performed to evaluate the effect of nozzle parameters on liquid film thickness and water production performance. In system performance experiments, the heat loss, heat recovery performance, fresh water production and gain output ratio in sunny weather were achieved. The daily fresh water production of the system was 15.1 kg with a maximum rate of 4.32 kg/h. The nozzle group arrangement optimization increases the fresh water production by 28.12 % and the maximum rate was 8.48 %. The heat recovery unit increases fresh water production by 13.18 %, with an average heat recovery efficiency of 0.85.

11月25日，Elsevier 旗下国际著名期刊《Renewable Energy》在线发表了云南师范大学物理与电子信息学院邰永航教授课题组的最新研究成果《Weekly solar irradiation forecasting method based on ICCEMDAN and TimesNet networks

》。云南师范大学物理与电子信息学院邰永航教授通讯作者。

https://www.sciencedirect.com/science/article/pii/S096014812301621X

Abstract

Long-term solar irradiance prediction can be more effective to plan and manage solar power systems. Existing methods have demonstrated the effectiveness of decomposing time series to enhance solar irradiance prediction models. However, these methods still have limitations in extracting potential sequence information from complex data sources. This makes the long-term prediction of irradiance still uncertain. In this paper, an improved complete ensemble empirical mode decomposition adaptive noise (ICEEMDAN) combined with TimesNet (ICEEMDAN-TimesNet) method is proposed. The ICEEMDAN method decomposes the subsequence features of the original irradiance, and the multidimensional spatial mapping of the data in the TimesNet model ensures that the model can efficiently extract historical information for the week-ahead hourly prediction of irradiance. In order to explore the performance of ICEEMDAN-TimesNet in the solar irradiance prediction task, several multi-step prediction models were established for comparison. Overall, the ICEEMDAN-TimesNet framework can report satisfactory testing results. The prediction curve is fitted to the trend of irradiance change which can play an excellent guiding role in scheduling electricity generation.