论文标题
关于浓缩太阳能应用的单个中等分层存储系统热元充电性能的实验研究
Experimental investigation on the performance of thermosyphon charging of a single-medium stratified storage system for concentrated solar power applications
论文作者
论文摘要
浓缩的太阳能（CSP）植物利用两坦克，明智的热量储存（TES），用于不间断的发电。但是，TES的设计和操作的成本很昂贵。因此，研究人员专注于实施单坦克存储。可以通过利用无泵的热态充电来进行其他削减。但是，先前针对TE的热元研究与小容量（<100升）和低温（<100°C）的国内水加热系统有关。因此，需要研究对高温存储的热态充电。这项研究的重点是单分层TE的热晶充电和存储。实验是在370升的圆柱存储（长宽比4：1）上进行的，其热管系统（3升体积）充当收集器。 Dowtherm-A油被用作传热液（HTF），并通过两种不同的设计（从储罐到扩展罐的顶部和底部连接）将HTF的热膨胀容纳在扩展罐中。此外，对低（150°C）和高（250和300°C）的温度研究了连续和脉动充电。结果表明，对于底部扩张设计，从加热管中提出的最高HTF温度更高。此外，与高温研究的顶级膨胀设置相比，它的充电效率更高。最后，据透露，在设计条件下，在充电周期中达到的热分层的程度和最大中途时间限制了中断的充电时间。这些结果提供了有关CSP应用的热轴充电分层存储的操作策略的见解。
Concentrated solar power (CSP) plants utilize two-tank, sensible-heat thermal energy storage (TES) for uninterrupted electricity generation. However, the cost for the design and operation of TES is expensive. Therefore, researchers are focusing on implementing single-tank storage. Additional cutbacks can be made by utilizing pump-less thermosyphon charging for the TES. But prior thermosyphon researches for TES are related to domestic water-heating systems of small-capacity (<100 liters) and low-temperature (<100 °C). Thus, investigations into thermosyphon charging for high-temperature storage are desired. This study focuses on thermosyphon-charging and storing of a single-medium stratified TES. The experiments were conducted on a 370 liters cylindrical storage (aspect ratio 4:1) with a heat-pipe system (3-liter volume) acting as a collector. Dowtherm-A oil was used as the heat transfer fluid (HTF), and the thermal expansion of HTF was accommodated in an expansion tank via two different designs (top and bottom connections from storage tank to expansion tank). Moreover, continuous and pulsatile charging are investigated for low (150 °C) and high (250 and 300 °C) temperatures. The results indicate that the maximum HTF temperature coming out of the heating pipes is ~25 °C more for the bottom-expansion design. Furthermore, it results in higher charging efficiency than the top-expansion setup for high-temperature studies. Finally, it is revealed that under design conditions, there are limits on the degree of thermal stratification achieved in the charging cycle and the maximum layover time allowable for interrupted charging. These results provide insights into the operational strategy of thermosyphon-charging stratified storage for CSP applications.
