a) Select main cooling coils with 6 coil rows minimum and 12 fins
minimum per inch where feasible. Consider selecting main cooling coils with 8
coil rows whenever possible to ensure adequate coil contact time for improved
b) Ensure chilled water supply temperature is low enough for
c) Keep face velocity through the cooling coils below 550 fpm.
Specify intertwined or vertical split-row cooling coils in lieu of horizontal
split-row cooling coils to ensure that the entire air passage area in the coil
comes in contact with active cooling surfaces for proper dehumidification.
Ensure that coils have low-bypass factors.
anticipated cooling load is larger than the capacity of the lowest stage of
e) Keep building under slight positive pressure by providing
slightly more make up air than the amount of air exhausted through the
bathroom exhausts and other exhaust systems.
f) Provide adequately sized condensate drains for all air
conditioning coils and insulate the waste lines.
Consider the use of heat recovery to reduce operating costs.
h) Do not use economizer cycles.
i) Use draw through air handlers where possible.
Locate exhaust registers as close as possible to the source of
k) Consider the use of air cooled condensers in lieu of cooling
1) Keep system and controls simple. Do not over design,
especially in areas where the lack of qualified maintenance may make
sophisticated systems and controls an upkeep problem.