Alternative Component Desiccant Cooling. Desiccant
providing full free cooling, or partial air-side economizer
cooling with a solid silica gel desiccant may be used in
cycle capable of providing some free cooling, and used
combination with mechanical cooling for high occupancy
in conjunction with additional mechanical cooling. The
applications where moisture removal is required. Natural
designer must ensure that proposed locations of outdoor
gas or condenser waste heat shall be used as fuel for
air intakes meet the GSA security requirements prior to
reactivation of the desiccant. Lithium chloride liquid
performing the life cycle cost analysis. If secure outdoor
desiccants are not permitted. Where these conditions are
air intakes are not feasible for this alternative, then
satisfied, the A/E shall analyze the life cycle cost of this
the alternative shall not be considered. The air-side
option.
economizer cycle shall provide leaving air conditions at
a maximum of 10.0C (50F) dew point and a maximum
Alternative Component Economizer Cycles. For floor-
of 70 percent relative humidity. Where an air-side
by-floor air-handling units with capacities over 1,416 L/s
economizer is not justified on a life-cycle cost basis, the
(3,000 cfm), the A/E shall analyze the life cycle cost of
A/E shall analyze the life cycle cost of providing a water-
providing a full air-side economizer cycle capable of
side economizer cycle.
Office of the Chief Architect, Public Building Service, Washington, DC
128 F A C I L I T I E S S T A N D A R D S
FOR THE
PUBLIC
BUILDINGS
SERVICE
5.5 Alternatives Components for the HVAC Baseline System
Revised March 2005 PBS-P100
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