| 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)拓展到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增加逐渐减小，Re从3 000增至6 020，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。 |
| 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 |
| DOI： |
| Received:November 13, 2021Revised:January 10, 2022 |
| 基金项目:国家自然科学基金（51976114）资助项目。 |
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| Experimental Investigation of Heat Transfer Characteristics of Louver and Wavy Fin Heat Exchangers of AHU using New Data Reduction Method |
|
Wu Pengzhan, Gu Bo, Zeng Weijie
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| (Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University) |
| Abstract: |
| 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 differenceand number of transfer units methods, the deviations of the j factorand 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 jfactor gradually decreased by 25.6% when increasing Re from 3 000 to 6 020. The j factor of a louver fin was larger than that of a wavy fin at the same Re, 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. |
| Key words: fin-and-tube heat exchanger heat transfer characteristics tube by tube method row-division discrete method air handling unit |
