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Outdoor
Swimmine Pool Heat Pump Sizine Worksheet
For
In-ground
Pool
Applications
Project Name:
Date:
1)
2)
3)
Pool Length
in Ft.
Pool
Width in
Ft"
Average
Pool
Depth in
Ft.
4)
Pool
SurfaceAreain
Sq.
Ft.
5)
Pool
Volume in
Cu.
Ft.
6)
Pool
Volume in
U.S. Gallons
1
A)
B)
c)
D)
E)
D
G)
H)
D
J)
K)
L)
7)
Calculated Pounds
of
Water to be
Heated.
Initial
Maintain
8)
Desired Pool Water Temperature
in
oF
9)
Starting Pool Water Temperature
in
nF
A
Ambient
Air
in
oF
11)
Calculated Water Temperature
1n
12)
Calculated
Air
Temperature
Difference in
oF
13)
Initial
BTU's
to Heat
the
Pool Water
with
no Surface Heat Loss
14)
Hours
Allowed to
Heat the Pool Water
to
Desired Temperature
15)
Initial
BTU/trr
Needed to Heat Pool Warer
in Time Atlowed
16)
Average
Wind
Speed
Factor
(see
below)
17)
Heat Loss
from Pool
Surface
in
BTU/hr
18)
Total BTU/hr
Required to Heat
&
Maintain
Pool Water Temperature
Instructions.
Assumotions. and
Additional
Notes
Entertheappropriatepooldimensionswhererequestedonlinedl,2,and3.
Ifthepooldepthisnotconstant,
please
enter the
overall
average
depth.
If
the
pool
is not rectangular
in
shape, please
moue on to
the
next
step.
Calculate lines 4, 5,
and 6
after
lines
1-3
are
filled
in.
There
are
7
.48
Gal
Water per Cu.
Ft. If
the
pool
is
not
rectangular
in
shape,
such
as
elliptical, oval,
&
kidney
shapes,
manually
calculate the
information
needed
for
lines
4
and
5 and enter the results
in
the appropriate boxes where requested on
these
lines.
Line
7:
There
are
62.42
Lb.
Water per Cu.
Ft.,
and 8.34
Lb.
Water per U.S.
Gallon.
Enter
the
desired
pool
temperature
in
both boxes on
line
8.
If
this temperature is not
known,
80oF
is
a
good
default to
use.
Enter
the
initial
pool
water temperature
in
the
box
on
line
9.
Generally,
this
will
not be
any
colder than
average
well
water temperature
(approximately
50oF.)
Enter the
average
arnbient outdoor air temperature
for
the coldest month that the
swimming pool
will
be
in
use
in
the
box
on
line
10.
Line 13:
Use the
following
equation
to
calculate
the
initial
BTU's
required to
heat the
pool without
any
consideration to time
or to
surface heat
loss
via
convection.
Initial
BTU's
=
1.0
[BTU/LB*.F]
x Line
7
x
Line
1l
fine
14:
Enter the amount
of time
in hours that
will
be allowed to
initially
heat
the
pool.
(4 to
5
days [120 hours]
is
normally
acceptable and economical
for
private pools.)
Line 15:
calculates
the
heating
capacity
(BTU/hr)
required to
initially
heat
the pool.
Heating Capacity
[BTU&r]
=
Line
13
I Line
t4
Line 16:
Enter the
average
wind
speed
correction factor
as
listed
be1ow.
(typically
3-5
MpH)
(<3
MpH
= .75,3
to
5
MpH =
1.0, 5
to
10
MpH =
1.25,
>10
MpH
=
2)
Line
17:.
calculate
the
BTU/hr
heat
loss
fiom
the surface
of
the
pool
due to convection.
Convection Losses
[BTU/hr] =
10.5
[BTU/hr*Sq Ft*oF] x Line
4 xLine
1.2
x
Line
16
The
greatest
heat loss
(typically
50-6OVo)
in
a
swimming pool
is rhrough
evaporation.
Radiatlon
and
evaporative
losses can be
reduced
507o
through the
use
of
a
pool
cover.
Solar gains
in
unshaded
pools
can add
up to iOO,000
BTU/hr which
offsets
some
convective
loss.
Because
of
these
solar gains
and
economic
reasons,
total heating
capacity
for only
one
half of
the convective
losses
are
required when
sizing.
Heat
loss
by
conduction through
pool
is
minimal
in
an
in-ground
pool.
Conduction
losses
for
above ground pools
can be
compensated
for by
the
average
wind
speed
correction factor.
Line 18:
Total BTU/trr
=
Lines
15
+ (Line
17
xll})
120
Appendix
L
-
Outdoor
Swimming Pool Heat Pump Sizing Worksheet
25
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