ASHRAE Journal - May 2020 - 87

ASHRAE RESEARCH UPDATE

FIGURE 1 The back (left) and front (right) of this coil show the fouling level on the coil that experienced the greatest increase in capacity caused by fouling in RP-1705,
Investigation of Airside Fouling on Condenser Heat Exchangers. The research report said that the results of testing the original ﬁeld-fouled coils show that fouling has negligible effects on total system performance for most of the coils that were tested, even with heavy apparent fouling.

FIGURE 2 The back (left) and front (right) of this coil show the most heavily fouled coil in the study. This coil had the greatest decrease in capacity caused by fouling.

In the ﬁrst phase of RP-1705, the researchers designed,
built and tested a test apparatus to measure the airside
effects of fouling on heat transfer and pressure drop.²
The test apparatus uses hot water instead of refrigerant
in the coil, to create controlled and repeatable conditions, according to the ﬁnal report. The apparatus can
simultaneously measure the heat transfer on the airside and water-side, and controls and measures airﬂow
and air pressure drop. A fan with similar behavior to
a typical constant speed condenser fan controlled the
airﬂow, so that testing could be conducted at constant
speed. This allowed the airﬂow rate to realistically
reduce as pressure drop increased. The researchers also
conducted more sets of tests at constant airﬂow rates by
adjusting the fan speed.
In the next phase, the researchers collected airconditioning systems that had been cooling homes for
many years, said Yuill. Photos from two of these coils are

shown in Figures 1 and 2. They studied the fouling material and then measured the condensers' heat capacity
and airﬂow resistance.³
"We tested the condensers while fouled, then carefully
cleaned each one and retested, to see how much difference the fouling made," he said.
Each coil was installed in the test apparatus and tested
in its as-found condition, according to the report. Then,
researchers tested the coils again after removing as
much fouling as possible by hand, then washing the
remaining fouling material off.
Another research stage studied the effectiveness of
detergents used to clean coils, as opposed to using water
alone. The study showed the results from cleaning the
coils with detergent, as opposed to cleaning with water
alone, was negligible for most coils. Sometimes, the
detergent degraded system performance, possibly by
adding a layer of undissolved detergent to some heat
M AY 2020

ashrae.org

ASHRAE JOURNAL

87

https://www.ashrae.org/

ASHRAE Journal - May 2020

Table of Contents for the Digital Edition of ASHRAE Journal - May 2020

Contents
ASHRAE Journal - May 2020 - Intro
ASHRAE Journal - May 2020 - Cover1
ASHRAE Journal - May 2020 - Cover2
ASHRAE Journal - May 2020 - 1
ASHRAE Journal - May 2020 - Contents
ASHRAE Journal - May 2020 - 3
ASHRAE Journal - May 2020 - 4
ASHRAE Journal - May 2020 - 5
ASHRAE Journal - May 2020 - 6
ASHRAE Journal - May 2020 - 7
ASHRAE Journal - May 2020 - 8
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ASHRAE Journal - May 2020 - Cover3
ASHRAE Journal - May 2020 - Cover4
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