Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions
Zhang, Feini
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https://hdl.handle.net/2142/31930
Description
Title
Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions
Author(s)
Zhang, Feini
Issue Date
2012-06-27T21:19:55Z
Director of Research (if dissertation) or Advisor (if thesis)
Jacobi, Anthony M.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
evaporative cooling
spray
louver-fin heat exchanger
wet surface
fouling
experiment
Abstract
Using an open-loop wind tunnel and a full-cone water spray nuzzle, the air-side performance of a liquid-to-air heat exchanger is studied experimentally for wet-surface conditions. The test specimen is a brazed-aluminum, louvered-fin heat exchanger. The total capacity, pressure drop and water drainage behavior under various water usage rates and air face velocities are explored and compared to data from dry-surface conditions. The impact of spray orientation is also studied. The results are presented as plots against water usage rate or water spray rate per unit heat transfer area. The experimental data are used to validate a model developed for simultaneous heat and mass transfer of a wetted heat exchanger. Fouling on the fin surface is observed in the experiment, and fouling characteristics are discussed in this thesis.
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