Feb.
Temperature increase with collectors
0
5
10
15
Jan.
Non-heated outdoor pool
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Average
pool
temperature
in °C
25
20
Typical temperature curve of an outdoor pool (average monthly val-
ues)
Location:
Würzburg
Pool surface area: 40 m
2
Depth:
1.5 m
Position:
Sheltered and covered at night
The following diagram shows the average temperature increase that
can be achieved with various ratios of absorber area to pool surface
area. This ratio is independent of the collector type used due to the
comparably low collector temperatures and the operating period
(summer).
Note
Heating and maintaining the pool temperature at a higher set tem-
perature using a conventional heating system does not alter this
ratio. However, the pool will be heated up much more quickly.
0
0
1
Ratio between the absorber area
and the pool surface area
Average temperature
increase
in K/d
2
3
4
5
6
7
8
0.2
0.4
0.6
0.8
1.0
1.2
Indoor pools
Indoor pools have a higher target temperature than outdoor pools
and are used throughout the year. If, over the course of the year, a
constant pool temperature is required, indoor pools must be heated
in dual mode. To avoid sizing errors, the energy demand of the pool
must be measured. For this, suspend reheating for 48 hours and
determine the temperature at the beginning and end of the test
period. The daily energy demand can therefore be calculated from
the temperature differential and the content of the pool. For new
projects, the heat demand of the swimming pool must be calculated.
On a summer's day (clear skies), a collector system used to heat a
swimming pool in central Europe produces energy of approx.
4.5 kWh/m
2
absorber area.
Calculation example for Vitosol 200-FM/-F
Pool surface area:
36 m
2
Average pool depth:
1.5 m
Pool capacity:
54 m
3
Temperature loss over 2 days:
2 K
Daily energy demand:
54 m
3
· 1 K · 1.16 (kWh/K · m
3
) =
62.6 kWh
Collector area:
62.6 kWh : 4.5 kWh/m
2
=
13.9 m
2
This corresponds to 6 collectors.
For a first approximation (cost estimate), an average temperature
loss of 1 K/day can be used. With an average pool depth of 1.5 m,
an energy demand of approx. 1.74 kWh/(d·m
2
pool surface area) is
required to maintain the set temperature. It is therefore sensible to
use an absorber area of approx. 0.4 m
2
per m
2
of pool surface area.
Under the following conditions, never exceed the max. absorber
area stated in the table:
■ Design output of 600 W/m
2
■ Max. temperature differential between the swimming pool water
(heat exchanger flow) and the solar circuit return 10 K
Vitotrans 200, type WTT
Part no.
3003 453
3003 454
3003 455
3003 456
3003 457
Max. connectable absorber area Vitosol
m
2
28
42
70
116
163
Information regarding design and operation
(cont.)
VITOSOL
VIESMANN
121
5822 440 GB
13
