摘要
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 accumulation technology constitutes an industrial waste heat recovery mode,which has extremely good prospects.Through a shell and tube heat exchanger,the phase change latent heat stored in the phase change material(PCM) by absorbing industrial waste heat was used for heating water,thereby realizing an industrial waste heat recovery and utilization.A two dimensional mathematical model for the shell and tube latent heat storage unit(LHSU) intensified by filling with high conductivity porous matrix was established and a phase change heat storage test was conducted simultaneously of a heat storage vessel being filled and one not filled with the porous matrix.The test results show that filling with the porous matrix can effectively improve the heat transfer performance of the PCM.The test data were in relatively good agreement with the calculated ones,having proved the validity of the calculation model.By making use of the model in question,a numerical calculation was performed of a heat storage system using three kinds of PCM(paraffin P116,stearic acid and palmitic acid).It has been found that the heat storage system using palmitic acid has the best thermal performance and can meet very well the design requirements for supplying daily used domestic hot water.The foregoing research findings can offer a definite guide for the design and performance optimization of heat storage systems.
出处
《热能动力工程》
CAS
CSCD
北大核心
2011年第1期53-57,122,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(50876004)
关键词
潜热蓄热
废热回收
多孔筛网
相变材料
相变蓄热系统
latent heat accumulation,waste heat recovery,porous matrix,phase change material,phase change heat accumulation system
