摘要
以肉豆蔻酸/膨胀石墨作为储热相变材料,分析肉豆蔻酸/膨胀石墨应用于水箱蓄热的可行性,计算出相变蓄热水箱临界取热温差为103.1℃,研制一种具有均流结构的相变蓄热水箱,并在此基础上设计一套用于测试相变蓄热水箱运行特性的实验系统。实验研究不同蓄热温度、储热单元数量和水箱内不同流速下相变蓄热水箱的蓄/放热特性。研究结果表明:融化过程中,较大的温差能加快相变材料的蓄热速率;在凝固过程中,为使储热单元热量释放出最多的可利用热量,水箱内水流速率取0.012m/s较适宜;相变单元可有效降低水箱内热水温度的下降速率,在包含150L蓄热介质的水箱中,取热温差为30℃,流量为3.3L/min的情况下,当蓄热单元占用水箱体积9.84%时,可比相同体积常规蓄热水箱多提供20%温度不低于40℃的热水。
The feasibility of using myristic acid/inflating graphite as phase change heat storage material in latent heat storage water tank was investigated. The temperature difference of 103.1 ℃ of critical charging/discharging heat in the water tank was obtained by calculation, and the operating model of latent heat storage water tank was discussed. Based on designing latent heat storage water tank with flow-equalizing structure, an experiment system which could test operating characteristics of the water tank was devised. The heat-charging/discharging performances of the water tank with different flow rates were investigated different heat storage temperature, by experiment. The results showed different number of heat storage unit and that the bigger temperature difference can expedite heat-charging rate of phase change materials in the melting process. In the process of solidification, flow rate of 0. 012m/s or so is appropriate. And the PCM units can reduce efficiently descendent ratio of temperature of hot water in water tank. Comparing with the traditional water tank which contains the same volume of 150L, the latent heat storage water tank with heat storage unit which occupy the volume of 9.84% can provide 33L hot water more with higher than 40℃ for the condition of temperature difference of 30℃ and flow of 3.3L/min.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2014年第4期670-676,共7页
Acta Energiae Solaris Sinica
基金
2011年教育部新世纪优秀人才培养计划
四川省住房城乡省级专项(2011306)
中央高校基本科研业务费专项(SWJTU09ZT09)
2012年四川省科技创新苗子资助项目(2012CZ007)
关键词
相变材料
相变蓄热水箱
蓄
放热特性
实验研究
phase change material
latent heat storage water tank
heat-charging discharging performance
experimental research
