Vol.2, No 5, 2005 pp. 431 - 443
UDC 534.6
IDENTIFYING DRYING MACHINE HEAT
EXCHANGER
NOISE
Nikola Holeček1, Marko Hočevar2
1Gorenje, SI - 3503 Velenje, P.O.
Box107,
Slovenia, nikola.holecek@gorenje.si
2University of Ljubljana, Faculty of
Mechanical Engineering, Aškerčeva cesta 6,
SI - 1000 Ljubljana, Slovenia, marko.hocevar@fs.uni-lj.si
Abstract. To carry out this research, we set up a measurement
station
for the analysis of aerodynamic noise induced by the drying machine
heat
exchanger. The adequate velocity field of the air flow was simulated,
while
eliminating the noise of the built-in fan to the greatest extent
possible.
All measurements were taken in the anechoic chamber. The integral and
local aerodynamic and acoustic characteristics of heat exchangers were
analyzed. The measurement of local aerodynamic characteristics
comprised
the measurement of the velocity fields with the hot wire anemometer on
the heat exchangers output plane. The possibility of the power spectra
estimation during the design of energetic properties of the heat
exchanger
is discussed.
Key Words: Noise, drying machine, heat exchanger, aeroacustics
measurement
IDENTIFIKACIJA AERODINAMIČNE BUKE
TOPLOTNOG IZMENJIVAČA MAŠINE ZA SUŠENJE RUBLJA
Za istraživanje je upotrebljen sistem za merenje i analizu aerodinamke
buke toplotnog izmenjivača mašine za sušenje rublja. Simulirano je
polje
brzine vazdušnog toka uz eliminisanje, u najvećoj mogućoj meri, buke
ugrađenog
ventilatora. Merenje su izvodena u anehoičnoj sobi. Analizirale su
integralne,
lokalne aerodinamične i akustične karakteristike kondenzatora. Lokalne
aerodinamične karakteristike su analizirane merenjem polja brzine sa
"hot
wire" anemometerom na izlaznoj površini kondenzatora. Razmatrana je
mogućnost
estimacije spektra snage u toku projektovanja energetskih osobina
toplotnog
izmenjivača.
Ključne reči: buka, mašina za sušenje, toplotni izmenjivač,
aeroakustična merenja.
