Heat Transfer Enhancement in a Cross-Flow Heat Exchanger with Modified Air Angles of Attack
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Publication Details
Author list: Toolthaisong S., Kasayapanand N.
Publisher: American Society of Civil Engineers
Publication year: 2016
Journal: Journal of Energy Engineering (0733-9402)
Volume number: 142
Issue number: 3
ISSN: 0733-9402
eISSN: 1943-7897
Languages: English-Great Britain (EN-GB)
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Abstract
The technique of heat transfer enhancement of a nonfin cross-flow heat exchanger by a modified air angle of attack is investigated experimentally in this study. Six air angles of attack (i.e., 0ฐ, 30ฐ, 60ฐ, 90ฐ, 120ฐ, and 150ฐ) with the same perimeter are examined to determine their relationships to the overall heat transfer coefficient and the pressure drop; the heat exchanger performance are also tested. In the experiment, hot water (at a temperature of 75ฐC) with a constant flow rate and air at ambient conditions with various velocities (ranging from 2 to 7 m/s) flows through the heat exchanger. The results indicate that the modified air angle of attack technique can enhance the overall heat transfer coefficient; however, the pressure drop is also increased. ฉ 2015 American Society of Civil Engineers.
Keywords
Aspect ratio (Ar), Cross-flow heat exchanger
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