accordance with ASTM A 307. The bolt head shall be marked to identify the
manufacturer and the standard with which the bolt complies in accordance
with ASTM A 307.
2.5
DESICCANT SYSTEMS
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NOTE: Desiccant systems are used basically for
large latent loads. These systems should be
engineered around a total system. They can be used
in buildings with humidity requirements lower than
mechanical equipment capacity, for preprocessing of
OA to lower the load on mechanical systems, and as
liquid systems to maintain exact humidity
requirements during all seasons. The designer
should look at existing energy sources for
regeneration when considering a desiccant system to
maximize equipment usage and energy savings.
Application of desiccant systems should involve
manufacturer input when coordinating equipment usage.
Designer should determine the type of DESICCANT
SYSTEM required and delete the unwanted systems.
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2.5.1
Solid Desiccant System
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NOTE: Desiccant cooling system equipment is sized
to meet space and ventilation latent cooling loads.
Typically, the desiccant dehumidifies ventilation
air so that, when the desiccant ventilation air is
mixed with return air from the space, the resulting
mixture is of sufficiently low specific humidity to
satisfy the latent load of the space. The
refrigerant-based post-cooling system is sized to
reduce the dry-bulb temperature of the mixture to
handle the space sensible cooling load. In some
cases, an optional pre-cooling coil is placed
upstream of the desiccant wheel so that the wheel
can more effectively dehumidify the outside air to
be introduced for ventilation or makeup. Optional
heating coils may be added in the desiccant unit
enclosure to partially or totally handle the space
heating loads.
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The unit shall be a complete, factory assembled and tested system, suitable
for outdoor installation. Each unit shall produce a capacity as rated in
accordance with ARI 210/240. It shall be designed for either curb mounting
or structural steel support. The unit shall include the following
components as defined in paragraph SYSTEM COMPONENTS:
a.
Desiccant Rotor
b.
Thermal Rotor (or heat pipe)
c.
Supply Fan
d.
Regeneration Fan
e.
Regeneration and Process Heating System
f.
Filters
SECTION 15500A
Page 11
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