论文部分内容阅读
固-液相变潜热蓄热技术是一种极具前景的工业废热回收方式,通过管壳式换热器可利用相变材料(PCM)吸收工业废热加以储存再用于加热水,从而实现了工业废热的回收利用。对填充高导热多孔筛网的管壳式潜热蓄热单元(LHSU)建立了二维数学模型,并对填充与未填充筛网的蓄热容器一同进行了相变蓄热实验。实验结果表明,填充筛网能够有效改善PCM的传热性能;实验数据和计算值吻合的较好,证明了计算模型的有效性。利用计算模型,对3种PCM(石蜡P116、硬脂酸和软脂酸)蓄热系统进行了数值计算。结果表明,采用软脂酸的蓄热系统热性能最佳,能很好地满足供应生活热水的设计要求。研究结论对蓄热系统的设计和性能优化有一定的指导作用。
Solid-liquid phase change latent heat storage technology is a promising industrial waste heat recovery, through the shell and tube heat exchangers can use phase change material (PCM) to absorb industrial waste heat to be stored and then used to heat the water, in order to achieve Industrial waste heat recovery and utilization. A two-dimensional mathematical model was established for the shell-and-tube latent heat storage unit (LHSU) filled with high thermal conductivity porous screen, and the phase change thermal storage experiment was carried out with the thermal storage container filled and unfilled screen. Experimental results show that filled mesh can effectively improve the heat transfer performance of PCM. The experimental data agree well with the calculated values, which proves the effectiveness of the computational model. Three kinds of PCM (paraffin P116, stearic acid and palmitic acid) heat storage system were numerically calculated by using the calculation model. The results show that the thermal storage system using palmitic acid has the best thermal performance and can well meet the design requirements of hot water supply. The conclusions of the study have certain guiding effect on the design and performance optimization of the heat storage system.