摘要
为研究翅片间距对储热单元的储热时间与储热量的影响,对管翅式相变储热单元的结构优化设计奠定基础,设计4种不同翅片间距的管翅式换热器,通过数值模拟与实际实验数据探讨翅片间距对储热时间及储热量的影响,进而选取两组翅片间距模型分析供暖运行参数对储热特性的影响规律。结果表明:在热泵工作温区下,翅片间距最小比最大模型的完全熔化时间缩短了79.57%,储热量减少了13.31%;进水温度升高,熔化时间缩短,储热量增加,与进水温度为55℃相比,进水温度为70℃的两组模型熔化时间分别缩短64.45%和65.77%,储热量分别增加17.27%和19.35%;进水流量提升促进相变材料熔化,最大入口流量与最小流量相比,两组模型完全熔化时间分别提升了11.54%和8.17%,储热量在8 h内分别增加8.10%和16.59%,且存在阈值流量,超过该流量后对储热量的影响很小。可见,减小翅片间距不仅降低储热量,还会导致储热单元成本显著提高,因此储热时间充裕的情况下,可以考虑适当放宽翅片间距以降低换热器的成本。
The impact of different fin pitches on the heat transfer rate and heat storage capacity of fin-tube solid-liquid phase change heat storage units was investigated.Numerical simulations and experimental data were used to analyze four fin-tube phase change heat storage units with different spacing.Two groups of fin spacing models were selected to examine the effect of heating operation parameters on the heat storage characteristics.The results show that the model with the minimum fin pitch had a shorter entire melting time by 79.57% and a lower heat storage capacity by 13.31% compared to the model with the maximum fin pitch under the working temperature zone of the heat pump.The inlet water temperature increases,the melting time of the phase change material decreases,and the heat storage capacity increases.Compared to an inlet water temperature of 55 ℃,the melting time of the two models with an inlet water temperature of 70 ℃ was reduced by 64.45% and 65.77%,respectively,while the heat storage capacity increases by 17.27% and 19.35%,respectively.The melting of the phase change material was promoted by elevating the inlet mass flow.The whole melting time of the two models increases by 11.54% and 8.17% under the conditions of the maximum and minimum inlet mass flow.The heat storage capacity increased by 8.10% and 16.59% in 8 h.It was observed that exceeding this threshold inlet mass flow has only a minimal effect on the heat storage capacity.It is evident that decreasing the fin spacing not only reduces the heat storage capacity but also significantly increases the cost of the heat storage unit.Therefore,if the heat storage time is sufficient,a wider fin spacing can be considered to reduce the cost of the heat exchanger.
作者
王纾禾
栾茹
王一波
国建鸿
赵勇
雷鸣宇
WANG Shu-he;LUAN Ru;WANG Yi-bo;GUO Jian-hong;ZHAO Yong;LEI Ming-yu(School of Electrical and Information Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102616,China;Institute Electrical Engineering Chinese Academy of Sciences,Beijing 100190,China)
出处
《科学技术与工程》
北大核心
2023年第29期12532-12540,共9页
Science Technology and Engineering
基金
国家重点研发计划(2019YFE0192400)
青海省重大科技项目(2019-GX-A9)
国家重点研发计划政府间国际科技创新合作项目(2019YFE0120200)。
关键词
相变储热
建筑供暖
数值模拟
结构优化
换热器
solid-liquid phase change
building heating
numerical simulation
structure optimization
enhanced heat transfer
