called for 22 environmental rooms to meet demanding and critical requirements.
eration system designed to operate using R-134A refrigerant.
Each room has its own independent refrigeration system,
including a water cooled condensing unit, a fan coil unit located within the ceiling plenum of each room area, and intercon-necting refrigeration piping. The core of the fan coil unit associated with the drosophila room is coated with an Electro-Fin
protective coating to reduce the corrosion associated with the
raising and feeding of flies.
The water-cooled refrigeration condensing units are
semi-hermetic units stacked three units high and located
in small mechanical closets situated close to the individual
groups of environmental rooms. The closets contain the electrical service disconnect switches as well as the building supply
and return water systems needed for proper equipment operation. These closets are ventilated using the building’s mechanical systems, in order to remove the residual heat buildup associated with the water-cooled refrigeration systems.
The two stability rooms were not designed with the typical
ceiling plenums utilized within the other environmental rooms.
The stability rooms were designed with external air handlers
located adjacent to each room area for temperature and humidity control based on the specific user requirements needed. The
conditioned air from the air handlers is ducted to supply diffusers located within the ceiling of each stability room. A return air
plenum is located low along one wall within each stability room
for collecting the room air and returning it to the air handler for
proper air distribution, providing the required uniformity levels
needed. The air handlers are also connected to the individual
semi hermetic, water-cooled, R-134A refrigeration condensing
units located in the mechanical closets.
The balance of the environmental rooms were constructed uti-
lizing 4-in. thick, UL rated, Class 1 foam insulated panels for the
walls and roofs and 2-in. thick insulated panels for the floors.
The building slabs were depressed 2.5-in. to allow for installa-
tion of the insulated floors. Leveling the 2-in. thick insulated
floors, in the depressions, up to the height of the surrounding
The insulated wall and roof panels were covered with a 24-gage galvanized steel skin with a white painted anti-microbial factory installed finish on
the room interiors. Each environmental room has a clear opening entry door with self-closing hinges, inside safety release, and a hydraulic door closer.
(Image: Suffolk Construction; Peter Vanderwarker)
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