6
Example:
Pool surface area
*
Indoor design air temperature
Pool water temperature
*
Relative Humidity
*
Outdoor design air temperature
16’ x 32’ (512 sq ft)
83 °F
81 °F
50 %
15 °F
* Always use design temperatures for indoor and outdoor air temperatures. Outdoor design
temperatures are published by organizations such as ASHRAE. Do not us day to day temperatures
for this calculation.
1.
From Table 1, select the appropriate evaporation rate based on the room air temperature,
water temperature, and relative humidity.
Evaporation Rate = 0.052
2.
From Table 2, select the corresponding flow Rate factor depending on the indoor air temperature,
outdoor temperature, and room relative humidity.
Flow Rate Factor = 21.70
Evaporation rate X
Flow Rate
= CFM / square foot of water surface area
0.052
X
21.70
= 1.12
4.
Multiply the value in step 3 by the area of the pool
X
Value for step 3
= CFM
Area of
pool 512
X
1.12
= 573
Calculating
the
Ventilation
Rate
for
the
Pool
Room
Spas/Hot
Tubs must
be
considered
when
calculating
the
ventilation rate
for
a
pool
room. This ventilation rate is
calculated by adding 10cfm per ft
2
of
Spa/Hot Tub surface area.
For
example,
a
25 ft
2
Spa/Hot Tub will add
250cfm
to
your
pool
calculation.
ATTENTION
3.
Multiply the values obtained from step 1 and step 2 to obtain the minimum CFM required per square foot of pool
surface area.
Summary of Contents for 1200 POOL
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