摘要
本文对方形组合式空调机组翅片管换热器空气侧的换热性能进行了实验研究和计算模型分析。将分布参数法(TTM)和创新的分排参数法(RDDM)拓展至方形组合式空调机组制热工况的实验数据处理中,分析翅片管换热器空气侧的换热性能,并与传统的ε-NTU法、集中参数法(LMTD)对比,4种方法计算的j因子和传热系数h偏差均在10%的范围内;基于分排参数模型,研究不同翅片形状、不同翅片间距、不同管径和不同翅片管排数下,传热因子j的变化情况。结果表明:j随Re的增加逐渐减小,Re从3000增至6020,j下降了25.6%。相同Re下,开窗翅片比波纹翅片的j大,并随着Re的增加两者之间的最大偏差从26.3%缩小为8.3%。j随翅片间距和管径的增大而增大,随着管排数增加而降低,8排管时j急剧降低至约0.008。
An experimental investigation was conducted into the heat transfer performance of the fin-and-tube heat exchanger in an air handling unit(AHU),and calculation models were used to analyze the experimental data.The tube-by-tube and row-division methods were extended to process the experimental data under the heating conditions,and the fin-and-tube heat exchanger was analyzed in terms of the heat transfer performance of the air side.Compared with the traditional logarithmic mean temperature difference and number of transfer units methods,the deviations of the j factor and heat transfer coefficient h calculated by the four methods were all within 10%.The effect of the j factor under different fin spacing,tube diameters,and the number of tube banks was studied.The results showed that the j factor gradually decreased by 25.6%when increasing Re from 3000 to 6020.The j factor of a louver fin was larger than that of a wavy fin at the same Re value,and the maximum deviation decreased from 26.3%to 8.3%with increasing Re.The j factor increased with increasing fin spacing and tube diameter and decreased with the number of tube banks.When there were eight tube banks,the j factor decreased sharply to approximately 0.008.The research provides a theoretical basis for the design optimization and operation of heat exchangers for AHUs.
作者
吴鹏展
谷波
曾炜杰
Wu Pengzhan;Gu Bo;Zeng Weijie(Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai,200240,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2022年第5期64-72,共9页
Journal of Refrigeration
基金
国家自然科学基金(51976114)资助项目。
关键词
翅片管换热器
流动换热特性
分排参数法
分布参数法
空调机组
fin-and-tube heat exchanger
heat transfer characteristics
tube by tube method
row-division discrete method
air handling unit
