基于圆柱封装单元的水合盐相变储热填充床的储释特性实验研究

Experimental study on heat storage and discharge characteristics of packed bed based on hydrated salt using cylindrical encapsulation units

水合盐相变储热技术具有储热密度高、成本低等优势,在清洁供暖中具有广阔应用前景。本研究设计并搭建了以三水合乙酸钠作为储热材料,以圆柱形相变材料封装单元作为基础单元的填充床相变储热装置。通过实验研究填充床储热装置的运行特性,研究了流量和储热温度对装置的储释热用时、出口温度、热效率及储热密度的影响。实验结果表明:提高储热温度和增大流量可缩短储热用时、提升热效率和储热密度。储热装置的热效率可达94.73%,储能密度可达71.77 kW·h/m^(3)。

Latent heat thermal energy storage technology based on hydrated salt phase-change materials(PSMs)characterized by high energy storage density and low cost,holds significant promise for widespread application in clean heating.In this study,we designed and constructed a packed-bed phase-change thermal storage system using sodium acetate trihydrate as the thermal storage material and cylindrical PSM encapsulation units as the fundamental building blocks.Through experimental investigations of the operational characteristics of the packed-bed thermal storage system,we explored the impact of the flow rate and thermal storage temperature on the charging/discharging duration,outlet temperature,thermal storage efficiency,and energy storage density of the system.The experimental results indicate that elevating the thermal storage temperature and increasing the flow rate can reduce the charging duration,enhance the thermal storage efficiency,and increase the energy storage density.The thermal efficiency of the storage system can reach 94.73%,and the energy storage density can achieve 71.77 kWh/m^(3).