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An experimental heat-transfer study for a heat-recovery unit made of corrugated tubes
Poredoš, Primož (Author), Šuklje, Tomaž (Author), Medved, Sašo (Author), Arkar, Ciril (Author)

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Abstract
This paper presents a study of the thermal characteristics of a concentric-tube heat exchanger that is a key element in local ventilation device. The inner tube of the concentric-tube heat exchanger has a sinusoidal, wavy surface in the longitudinal direction, which enables heat-transfer enhancement. The tube can be stretched to a certain extent and thus change the corrugation of the heat-transfer surface area. We designed an experiment in which we used the Wilson-plot method to separately determine the convective heat-transfer coefficient on the inside and outside of the inner tube of the concentric-tube heat exchanger with different corrugation ratios. Based on the measurements correlation equations were developed to calculate the convective heat-transfer coefficient for any corrugation ratio, which allows us to simplify the design of local ventilation devices. Performed studies showed that, compared to a smooth tube, the convective heat-transfer coefficient increased only in the case of corrugated tubes with a corrugation ratio of less than 1.648, but the heat transfer was more intense for all considered corrugated tubes by 65-90% due to the increased heat-transfer surface area. The highest heat-transfer rate was observed for the case of the maximum-stretched tube with a corrugation ratio of 1.401, which is advantageous also in terms of material consumption.

Language:English
Keywords:convective heat-transfer coefficient, corrugated tubes, Wilson-plot method, heat exchanger
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2013
Number of pages:Str. 49-56
Numbering:Vol. 53, iss. 1
UDC:697:628.8
ISSN on article:1359-4311
DOI:10.1016/j.applthermaleng.2013.01.004 This link opens in a new window
COBISS.SI-ID:12647963 This link opens in a new window
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Record is a part of a journal

Title:Applied Thermal Engineering
Shortened title:Appl. therm. eng.
Publisher:Elsevier
ISSN:1359-4311
COBISS.SI-ID:1861910 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0223
Name:Prenos toplote in snovi

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:02.04.2021

Secondary language

Language:Slovenian
Keywords:koeficient toplotne prestopnosti, Wilsonova metoda, prenosnik toplote, orebrene cevi

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