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

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:convective heat-transfer coefficient, corrugated tubes, Wilson-plot method, heat exchanger
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2013
Št. strani:Str. 49-56
Številčenje:Vol. 53, iss. 1
UDK:697:628.8
ISSN pri članku:1359-4311
DOI:10.1016/j.applthermaleng.2013.01.004 Povezava se odpre v novem oknu
COBISS.SI-ID:12647963 Povezava se odpre v novem oknu
Število ogledov:134
Število prenosov:78
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Gradivo je del revije

Naslov:Applied Thermal Engineering
Skrajšan naslov:Appl. therm. eng.
Založnik:Elsevier
ISSN:1359-4311
COBISS.SI-ID:1861910 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P2-0223
Naslov:Prenos toplote in snovi

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:02.04.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:koeficient toplotne prestopnosti, Wilsonova metoda, prenosnik toplote, orebrene cevi

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