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)

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
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2013
• Št. strani: Str. 49-56
• Številčenje: Vol. 53, iss. 1
• PID: 20.500.12556/RUL-125698
• UDK: 697:628.8
• ISSN pri članku: 1359-4311
• DOI: 10.1016/j.applthermaleng.2013.01.004
• COBISS.SI-ID: 12647963
• Datum objave v RUL: 02.04.2021

Gradivo je del revije

• Naslov: Applied thermal engineering
• Skrajšan naslov: Appl. therm. eng.
• Založnik: Elsevier Science
• ISSN: 1359-4311
• COBISS.SI-ID: 1861910

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

Projekti

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