ETL 1110-1-180
29 Aug 97
of the structural element within the natatorium has a surface temperature below the dewpoint of
the warm moist pool air. Condensation and associated corrosion and insulation damage then
occurs. An intermediate space between the roof supports and the pool area that is thoroughly
insulated per guide specification is one method to avoid these structurally related condensation
problems. A concrete roof structure with their long spanning capabilities is another acceptable
method.
b. Desiccant equipment. ASHRAE recommends humidity control by means of additional
outside ventilation air in drier climates. In other climates, mechanical dehumidification will be
required. Desiccant dryers with waste heat recovery can be a cost effective alternative and should
be considered along with other methods of mechanical dehumidification. The equipment materials
and components shall be specifically designed and specified for high humidity swimming pool
environments to minimize, if not eliminate corrosion.
c. Controls . Most pools have a number of independent mechanical systems such as air
handling units, dehumidification equipment, heat recovery systems, and pool water heaters with
the associated dampers and pumps. It is important for the designer to coordinate the controls of
these mechanical systems to ensure the effective operation of not only each component, but the
combined system.
d. Pool covers. A method to aid humidity control and conserve pool heat is by the use of
swimming pool covers. The designer should be aware that during unoccupied periods when the
pool is covered, dehumidification equipment operates very infrequently. Heat recovery from the
dehumidifiers is extremely limited during these time periods. Alternate heat sources should be
provided as needed.
e. Quality control. A successful natatorium design will never be realized without the follow
through of an effective construction quality assurance program. This includes the proper
installation of all pool interior hardware, mechanical systems including controls, insulations, vapor
barriers, and caulking. An effective quality assurance program during both the design and
construction phases will help ensure a facility that meets the users needs without either humidity
or corrosion problems.
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