Occupants
Daily DHW de-
mand in l (60 °C)
Buffer cylinder capacity in l
Collector
No. of Vitosol-F
Area of Vitosol-T, type
SP2A/SP3B
2
60
750
4 x SV
4 x SH
2 x 3.03 m
2
3
90
4
120
750/950
5
150
2 x 3.03 m
2
1 x 1.51 m
2
6
180
7
210
950
6 x SV
6 x SH
3 x 3.03 m
2
8
240
For low energy houses (heat demand less than 50 kWh/(m
2
p.a.)),
solar coverage of up to 35 %, relative to the total energy demand, incl.
DHW heating, can be achieved according to this sizing. For buildings
with a higher heat demand, the coverage is lower.
The Viessmann calculating program "ESOP" can be used for the exact
calculation.
Swimming pool heating system – heat exchanger and collector
Outdoor pools
In central Europe, outdoor pools are mainly used between May and
September. Your energy consumption depends primarily on the leak-
age rate, evaporation, loss (water must be replenished cold) and
transmission heat loss. By using a cover, the evaporation and conse-
quently the energy demand of the pool can be reduced to a minimum.
The largest energy input comes directly from the sun, which shines
onto the pool surface. Therefore the pool has a "natural" base tem-
perature that can be shown in the following diagram as an average
pool temperature over the operating time.
A solar thermal system does not alter this typical temperature pattern.
The solar application leads to a definite increase in the base temper-
ature. Subject to the ratio between the pool surface and the absorber
area, a different temperature increase can be reached.
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 what average temperature increase can
be achieved with which ratio of absorber area to pool surface. 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 temper-
ature 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 generally 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 tem-
perature differential and the capacity 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-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.
Information regarding design and operation
(cont.)
VITOSOL
VIESMANN
139
5822 440 GB
18
