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Thermal Performance Reduction in Air-Cooled Heat Exchangers Due to Nonuniform Flow and Temperature Distributions

 

作者: M. G. BEILER,   D. G. KRÖGER,  

 

期刊: Heat Transfer Engineering  (Taylor Available online 1996)
卷期: Volume 17, issue 1  

页码: 82-92

 

ISSN:0145-7632

 

年代: 1996

 

DOI:10.1080/01457639608939867

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

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 are employed in the analysis in order to determine to what extent airflow maldistribution reduces exchanger performance. It is found that maldistribution occurring in well-designed air-cooled heat exchangers reduces the thermal performance by only a few percent.

 

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