ǂAn ǂexperimental heat-transfer study for a heat-recovery unit made of corrugated tubes
Povzetek
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.
Ključne besede
koeficient toplotne prestopnosti;Wilsonova metoda;prenosnik toplote;orebrene cevi;convective heat-transfer coefficient;corrugated tubes;wilson-plot method;heat exchanger;
Podatki
| Jezik: | Angleški jezik |
|---|---|
| Leto izida: | 2013 |
| Tipologija: | 1.01 - Izvirni znanstveni članek |
| Organizacija: | UL FS - Fakulteta za strojništvo |
| UDK: | 697:628.8 |
| COBISS: |
12647963
|
| ISSN: | 1359-4311 |
| Št. ogledov: | 314 |
| Št. prenosov: | 160 |
| Ocena: | 0 (0 glasov) |
| Metapodatki: |
|
Ostali podatki
| Sekundarni jezik: | Slovenski jezik |
|---|---|
| Sekundarne ključne besede: | koeficient toplotne prestopnosti;Wilsonova metoda;prenosnik toplote;orebrene cevi; |
| Vrsta dela (COBISS): | Članek v reviji |
| Konec prepovedi (OpenAIRE): | 2015-01-19 |
| Strani: | str. 49-56 |
| Letnik: | ǂVol. ǂ53 |
| Zvezek: | ǂiss. ǂ1 |
| Čas izdaje: | 2013 |
| DOI: | 10.1016/j.applthermaleng.2013.01.004 |
| ID: | 12721875 |
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