Vol.1, No 7, 2000 pp. 849 - 861
UDC 62-71:621.1.016.4 621.565:621.1.016.4
EXPERIMENTAL STUDY ON HEAT AND
MASS TRANSFER
IN COOLING TOWERS
Velimir Stefanović, Slobodan Laković,
Nenad Radojković, Gradimir Ilić
Faculty of Mechanical Engineering, University of Niš, FR Yugoslavia
Abstract. Abstract. In this paper, the results of an experimental
study on heat and mass transfer coefficients in packing of wet cooling
towers, are presented. The investigations have been carried out at a test
rig erected in the Thermal engineering laboratory of Mechanical engineering
faculty, Niš. Schematic presentation of the test facility together with
the distribution of measuring spots are shown.
The packing, used during experimentation, was made of parallel plexiglass
plates 5mm thick, with 40 mm distance between each other and 1200 mm in
height, placed in a vertical 470x470 mm channel. During the experimentation
the following quantities were varied: air flow velocity in the range 1,5-5
m/s and water flow rate in the range 2-3 m3/h.
The variation of temperature along the height of packed was measured by
means of 26 appropriate placed thermocouples. The obtained results are
presented by means of diagrams.
Key words: cooling towers, experiment, numerical
EKSPERIMENTALNA STUDIJA PROSTIRANJA
TOPLOTE I MASE U RASHLADNIM TORNJEVIMA
U ovom radu su prikazani rezultati eksperimentalnog određivanja koeficijenata
prenosa toplote i mase u ispuni vlažnih rashladnih tornjeva. Istraživanja
su obavljena na eksperimentalnoj aparaturi konstruisanoj u Laboratoriji
za termoenergetiku i termotehniku na Mašinskom fakultetu u Nišu. Prikazana
je eksperimentalna instalacija i instrumentacija.
U eksperimentalnom istraživanju korišćena je ispuna napravljena od
pleksiglas ploča debljine 5 mm i visine 1200 mm, koje su postavljene na
međusobnom rastojanju od 40 mm. Ispuna je smeštena u vertikalnom kanalu
kvadratnog poprečnog preseka 470x470 mm. U toku eksperimentalnog istraživanja
varirana je brzina vazduha u opsegu 1,5-5 m/s i protok vode u opsegu 2-3
m3/h. Promena temperature po visini ispune
merena je pomoću 26 pogodno postavljenih termoparova. Dobijeni rezultati
su prikazani u formi dijagrama.
Ključne reči: rashladni toranj, eksperiment, numerika
