镍泡沫定型相变材料制备与性能研究

聚光光伏热电耦合系统(CPV-TE) 通过聚光增大光照强度, 提升热电模块两侧的温差进而提高热电效率, 但聚光同时也带来光伏电池温度过高等问题。提高冷端换热能力是降低光伏温度, 提升热电冷热端温差的有效手段。研究了不同光强下, 冷端冷却温度、冷却水流速以及不同冷却介质对CPV-TE 的影响。研究发现降低冷却水温度和提高介质流速, 不仅降低光伏电池温度、提高光电转化效率, 而且增大热电模块两侧的温差提高热电效率。采用MWCNT- 水纳米流体作为换热介质, 可以进一步提升冷却效果进而提高系统整体输出。

Study on the Preparation and Performance of Nickel Foam Shaped Phase Change Materials

The concentrated photovoltaic-thermoelectric hybrid system (CPV-TE) increases the light intensity by concentrating, whichenhances the temperature difference between the two sides of the thermoelectric module to improve the thermoelectric efficiency. However, concentrating also brings problems such as the excessive temperature of the photovoltaic cell. Improving the heat transfer capacity of the cold end is an effective method to reduce the photovoltaic temperature and improve the temperature difference between the two sides of the thermoelectric module. The effects of cooling temperature at the cold end, cooling water flow rate, and different cooling media on the CPV-TE hybrid system were investigated under different light intensities. The result shows that reducing the cooling water temperature and increasing the medium flow rate could reduce the temperature of the photovoltaic cell and increase the temperature difference between the two sides of the thermoelectric module, thereby improving the photoelectric conversion efficiency and the thermoelectric efficiency. Moreover, the cooling effect is enhanced by using the MWCNT-water nanofluid as a heat exchange medium to improve the overall output of the system.