This study presents a newly developed approach to velocity measurements of moist air in a natural-draught cooling tower (CT). It is based on the cross-correlation of two signals acquired from infrared (IR) light-to-voltage optical sensors. The air flowing through the CT becomes supersaturated in CT packings and thus consists of small water droplets of size 4-12 m. The same air usually contains droplets resulting from drift, which drags along too small droplets in the spray zone. When the moist-air droplet pattern crosses the beam emitted by IR light-emitting diodes (LEDs), the optical sensors detect a certain signal. The cross-correlation technique gives the time delay of the measured signals. Therefore, by knowing the distance between the sensors, it is possible to calculate the velocity of the moist air. The methodhas been developed for dynamic velocity measurements of moist air and has achieved a satisfactory precision. The optical velocimeter is a very practical device that makes it possible to carry out measurements on a local basis across the entire plane area of the CT. With the use of simultaneous measurements of velocities and temperatures, the exact location of problems with the packings, nozzles and water distribution system can be thus determined.
| Jezik: | Angleški jezik |
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| Ključne besede: | meritve hitrosti, optični senzorji, hladilni stolpi, vlažnost zraka, dignostične metode, termodinamika, velocity measurement, optical sensors, cross-correlation, cooling tower, moist air |
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| Vrsta gradiva: | Delo ni kategorizirano (r6) |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | FS - Fakulteta za strojništvo |
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| Leto izida: | 2007 |
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| Št. strani: | str. 555-560 |
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| Številčenje: | Letn. 18, št. 3 |
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| UDK: | 535:536.7 |
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| ISSN pri članku: | 0957-0233 |
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| COBISS.SI-ID: | 9834267  |
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| Število ogledov: | 1105 |
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| Število prenosov: | 368 |
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| Metapodatki: |     |
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| Skupna ocena: | (0 glasov) |
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| Vaša ocena: | Ocenjevanje je dovoljeno samo prijavljenim uporabnikom. |
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