An assessment of optimal airside heat transfer per unit friction power characteristics of compact heat exchangers

•The airside thermal-hydraulic characteristics of compact surfaces are presented.•A robust method is used to evaluate different type of compact heat exchangers.•The method considers heat transfer performance per unit pumping power.•Experimental data of various finned surfaces of compact heat exchang...

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Bibliographic Details
Published in:International journal of refrigeration 2019-03, Vol.99, p.479-489
Main Authors: Qasem, Naef A.A., Al-Ghamdi, Abdulrahman A., Zubair, Syed M.
Format: Article
Language:English
Subjects:
Ailettes
Circular tubes
Compacité
Compact heat exchangers
Compactness
Fins
Friction
Friction factor
Heat conductivity
Heat exchangers
Heat transfer
Optimal
Puissance de pompage
Pumping
Pumping power
Transfert de chaleur
Échangeurs de chaleur compacts
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Summary:•The airside thermal-hydraulic characteristics of compact surfaces are presented.•A robust method is used to evaluate different type of compact heat exchangers.•The method considers heat transfer performance per unit pumping power.•Experimental data of various finned surfaces of compact heat exchangers are studied.•Both the strip- and pin-fin surfaces show optimal performance. This paper evaluates an optimal airside thermal-hydraulic performance of compact heat exchangers. Seventy-five airside surfaces have been chosen, i.e. standard reference of Kays and London, to represent louver-fin, strip-fin, wavy-fin, plain-fin, pin-fin, finned circular tubes and finned flat tubes. A robust evaluation method is implemented by an estimation of the heat transfer rate per unit pumping power with and without considering the heat exchanger compactness. Experimental data of Colburn j-factor and Fanning friction factor (f) are used to estimate both the heat transfer rates and the friction power, respectively. The results demonstrate that strip-fin surface 1/10-27.03 shows an optimal heat transfer values per unit friction power when the compactness is taken into consideration. Nonetheless, pin-fin surface PF-4(F) shows an optimal heat transfer rate per pumping power when neglecting the importance of the compactness. The geometries having an optimal thermal-hydraulic performance for each airside type (with or without considering the compactness) are recommended as benchmarks to assess the performance of similar airside surfaces.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2018.12.030