MCDM AG.COM | NOV EMBER / DECEMBER 2017 | Medical Construction & Design
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with a general exhaust clean
airstream coming from rest-
rooms and workrooms in the
building. This allows for the
recovery of energy that other-
wise would have been wasted.
This pretreated air then passes
through a Type III desiccant
wheel, which continuously
transfers moisture from one
side of the wheel to the other,
leaving the discharge air at a
low 40 grains of moisture per
pound of dry air. A fi nal cooling
coil maintains the discharge air
temperature between 52 F and
65 F to temper heat gain from
the desiccant.
The higher discharge air
temperature provides substan-
tial energy savings on chilled
water usage at the AHU and
on re-heat energy usage at the
VAV terminals. The lower air-
moisture content allows the air
to be tempered with a re-cool-
ing coil to meet sensible space
loads without risk of moisture
condensation at the terminal
box, eliminating the need for a
fi nal fi lter.
This approach enabled the
cost-eff ective delivery of 100
percent outside air to each pa-
tient room without the higher
maintenance or fi rst cost of
other systems like chilled beam
or displacement ventilation.
From left: MEP strategies for the
hospital included those to reduce
and optimize energy and water use,
contributing to a minimum LEED
Silver certifi cation and Austin Energy
Green Building certifi cation.
> The
new Dell Seton Medical Center at the
University of Texas is a new teaching
hospital in Austin. It implements
innovative solutions to support the
highest standard of care, reduce
energy use and cost and ensure
sustainability.
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