新型板式相变单元蓄热特性的理论及实验研究

THEORETICAL AND EXPERIMENTAL RESEARCH ON HEAT STORAGE CHARACTERISTICS OF NEW TYPE OF PLATE PHASE CHANGE UNIT

在太阳能储能装置中,保持相变储能单元组配灵活性不受影响的同时,为了增强板式相变单元的蓄热性能,对普通的矩形板式单元进行结构优化,设计了新型的梯形体单元,并利用理论分析得到了最优梯形体结构的理论解。将理论分析结果进行实验验证,研究表明:设计出的新型梯形体板式单元不仅能充分利用相变材料本身的熔化特性提升储能装置的蓄热性能,还能提高空间利用率。在研究范围内,换热流体流速的增大和温度的增加可有效地提高单元的换热效率,其中,流速为0.12 m/s时最优梯形体单元比之矩形单元的蓄热性能提升最明显。

While avoiding any compromise on the flexibility of assembly for phase change energy storage unit in solar energy storage devices,the structure of ordinary rectangular plate unit was optimized to enhance the heat storage performance of plate phase change unit,a new type of trapezoidal unit was designed,and the theoretical solution to optimal trapezoid structure was obtained through theoretical analysis.Besides,the results of theoretical analysis were verified by means of experimentation,suggesting that the designed new trapezoidal plate unit is not only capable of enhancing the heat storage performance of energy storage device by taking advantage of the melting characteristics of the phase change material,but also effective in improving the rate of space utilization.As far as this study is concerned,the increase in the flow rate of the heat exchange fluid and temperature rise are effective in improving the efficiency of heat exchange for the unit.To be specific,when the flow rate reached 0.12 m/s,the optimal trapezoidal unit showed a more significant sign of improvement in heat storage performance than the rectangular unit.