percent outdoor ambient dewpoint temperature is higher than the design indoor
dry bulb temperature.
Equipment Insulation. Provide insulation with vapor barrier and
coatings on all equipment associated with the chilled water, refrigeration, or
air conditioning system, including chilled water pumps, air handlers and
Humidity Control. Control humidity through the use of properly
designed air conditioning systems to provide adequate dehumidification.
System Selection and Sizing. Consider the capacity of the air
conditioning system for cooling and dehumidification under full and minimum
part load conditions in the design analysis. In general, use the one percent
design wet bulb temperature from NAVFAC P-89 for equipment sizing and in the
calculation of the latent cooling load.
Sizing. For the locations indicated, size the comfort air
conditioning systems on the criteria in Table 3.
Cooling Coils. Ensure cooling coils have adequate latent, as well
as sensible, cooling capacity under full and minimum part load conditions.
System Design Considerations. Where possible, design the air
conditioning system to provide cooling for the entire building as follows.
General. Air condition toilets, corridors, closets, and storage
rooms. Provide circulation of conditioned air through enclosed spaces.
a) Use excess air from the air conditioned space to make up air
exhausted from the bathrooms. Do not include the bathroom cooling loads in
close to shower areas.
b) In Guam, Philippines, and Diego Garcia and other high humidity
tropical areas where the 1 percent ambient dewpoint temperature exceeds 70
equipment to supply one to two air changes/hour of conditioned air to slightly
pressurize the mechanical room spaces and to maintain the room conditions in
the range of 80 degrees F to 85 degrees F dry bulb and 50 percent to 60
through room exfiltration.
c) Treat space above ceilings as a conditioned space in areas
where the 1 percent ambient dewpoint temperature exceeds the indoor dry bulb
Circulate conditioned air in the ceiling plenums to prevent