TAB Journal Summer 2019 - 11

UNIT SECTIONS
Exhaust

Supply

IDENTIFYING THE CULPRIT
With our fi ndings recorded, we began to meet with the
engineer and manufacturer to see where we could locate
the discrepancy. The three energy recovery units had
been pressure leak tested by the manufacturer. Could the
casings of the units now be the issue? The exhaust airflow
was within design. Could it be internal leakage? The
manufacturer stated this was not possible. Even though we
were told that the issue was not in the unit, we began to
formulate the factors which may be leading to our missing
air. It was not possible to directly measure airflow after the

TAB Journal Summer 2019

exhaust fans. Plotting the exhaust test results on the fan
curve, we found that we had 20 percent higher air volume
and using 25 percent more brake horsepower than we should
be if we were at the design conditions and from incoming
traverses. Fan curves are not always the most accurate means
of determining performance from field tests, but having this
information helped point us in the right direction.
The next step was to isolate and test each side of the unit
individually. We tested the outside air supply fi rst; we turned
off the exhaust fan side and sealed all exhaust openings,

11



TAB Journal Summer 2019

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TAB Journal Summer 2019 - Cover3
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