Thermal Performance Reduction in Air-Cooled Heat Exchangers Due to Nonuniform Flow and Temperature Distributions
Thermal Performance Reduction in Air-Cooled Heat Exchangers Due to Nonuniform Flow and Temperature Distributions
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DOI：
10.1080/01457639608939867
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发表时间：
1996
影响因子：
2.3
通讯作者：
M. G. Beiler;D. Kröger
中科院分区：
文献类型：
--
作者：
M. G. Beiler;D. Kröger
本文讨论了不均匀（或分布不均）的入口气流和温度对交叉流风冷热交换器热性能的影响（两种流体未混合），并考虑了各个管排性能特征的差异。后者可能是由于不同的翅片间距或其他几何变化或由于空气湍流变化而导致的行效应。这种多排管束中的下游管排比进气口处的管排经历了更高的性能降低。管排的空气速度分布不均匀会导致管排的温度分布发生扭曲。当空气通过后续管排时，这种温度不均匀性会增加，并导致下游排的效率逐渐降低。本分析用于评估各个管排以及最终整个管束的性能。在风冷热交换器模型上测量的速度分布...
The effect of nonuniform (or maldistributed) inlet airflow and temperature on the thermal performance of cross-flow air-cooled heat exchangers, with both fluids unmixed, and taking into consideration differences in performance characteristics of individual tube rows, is addressed in this article. The latter may be due to different fin pitches or other geometric variations or row effects due to changes in air turbulence. Downstream tube rows in such a multirow tube bundle experience higher performance reductions than the tube row at the air inlet. A nonuniform air velocity distribution to a tube row leaves the row with a distorted temperature profile. This temperature nonuniformity increases as the air passes through subsequent tube rows, and causes the downstream rows to be progressively less effective. The present analysis is used to evaluate the performance of the individual tube rows and ultimately the entire bundle. Velocity distributions which have been measured on air-cooled heat exchanger models ar...