Primož Poredoš (Author), Tomaž Šuklje (Author), Sašo Medved (Author), Ciril Arkar (Author)

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.

Keywords

koeficient toplotne prestopnosti;Wilsonova metoda;prenosnik toplote;orebrene cevi;convective heat-transfer coefficient;corrugated tubes;wilson-plot method;heat exchanger;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 697:628.8
COBISS: 12647963 Link will open in a new window
ISSN: 1359-4311
Views: 314
Downloads: 160
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: koeficient toplotne prestopnosti;Wilsonova metoda;prenosnik toplote;orebrene cevi;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2015-01-19
Pages: str. 49-56
Volume: ǂVol. ǂ53
Issue: ǂiss. ǂ1
Chronology: 2013
DOI: 10.1016/j.applthermaleng.2013.01.004
ID: 12721875
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