Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

An Experimental and Computational Study of Approach Air Distribution for Slanted and A-Shaped Finned-Tube Heat Exchangers

Published

Author(s)

David A. Yashar, Piotr A. Domanski, Hong Hyun Cho

Abstract

One of the most influential factors of the performance of a finned tube heat exchanger is the distribution of the air passing through it; therefore it must be known in order to produce a highly efficient design. We examined two different common style air-to-refrigerant, finned-tube heat exchangers in this study; a single slab coil oriented at an angle of 65º to the duct wall and an A-Shaped coil with an apex angle of 34º. We used Particle Image Velocimetry (PIV) to measure their in-situ air flow distributions. The results show that the air flow distributions for both of these heat exchangers are highly nonuniform with different sections subject to vastly different air velocities. We also used a momentum resistance based CFD approach to model the air flow distributions through these heat exchangers and the results agreed with the measured values, with most of the simulated velocities within 10 % of the measured velocities. The results of this study show that the velocity profile for any configuration is strongly influenced by the geometrical features of the heat exchanger and other features in its proximity, and therefore each installation configuration will have its own unique velocity distribution. The information presented in this paper documents several features of inherently maldistributed air flowing through finned-tube heat exchangers and highlights its sources and magnitude.
Citation
Hvac&R Research
Volume
20

Keywords

air flow distribution, finned tube heat exchanger, particle image velocimetry, momentum resistance CFD

Citation

Yashar, D. , Domanski, P. and , H. (2014), An Experimental and Computational Study of Approach Air Distribution for Slanted and A-Shaped Finned-Tube Heat Exchangers, Hvac&R Research, [online], https://doi.org/10.1080/10789669.2014.899466 (Accessed August 3, 2021)
Created July 1, 2014, Updated November 10, 2018