Viessmann Vitosol100 - H Examples of Estimates of the Required Collector Surface Area and the Number of Collectors

3.1Calculating the required collector surface area
41
VITOSOL
Examples of estimates of the required collector area and number of collectors
Example1 Example2
DHW loading for a detached house
H Würzburg area
H Roof pitch=45º
H Number of occupants P=4,
average requirements
H Hot water temperature t
w
=45 ºC
H Cold water temperature t
k
=10 ºC
H Required coverage: 60
%
H Collector type:
a) Vitosol 100 flat collector
b)Vitosol 200 vacuum tube collector
c) Vitosol 250 vacuum tube collector
d)Vitosol 300 vacuum tube collector
In poor weather conditions, a Viessmann
oil/gas boiler supplies the balance of the
heat required for DHW loading.
Domestic hot water
(see table on page38)
Selected hot water requirement according
to VDI2067
V
p
=50 litres/(d·person)
This gives a hot water requirement for
4persons of 200litres/d.
Cylinder capacity
(see page38)
Selected cylinder temperature
t
cyl
=60 ºC
V
cyl
min
=
2  V
p
 P 

t
w
 t
k

t
cyl
 t
k
V
cyl
min
=
2  50  4 
(
45  10
)
60  10
V
cyl
min
= 280litres
Here we recommend the use of a
Viessmann VitocellB100 DHW cylinder
with 300litres capacity or a VitocellV300,
type EVI, with 200litres capacity as a
pre−heating cylinder.
Total surface area A
G
and number of
collectors z
a) Vitosol 100 flat collector, types/w2.5
Aperture area: 2.50m
2
,
Required aperture area A per occupant:
1.2 to 1.5 m
2
(see table on page40)
A
G
= A·P
A
G
= (1.2 to 1.5m
2
) · 4
A
G
= 4.8 to 6.0 m
2
In this case, 2collectors
types/w2.5 are recommended.
The coverage is approx. 60
%.
b) Vitosol 200 vacuum tube collector
Aperture area for
type D10: 1.07 m
2
type D20: 2.14 m
2
type D30: 3.21 m
2
Required aperture area A per occupant:
0.8 to 1.0 m
2
(see table on page40)
A
G
= A·P
A
G
= (0.8 to 1.0m
2
) · 4
A
G
= 3.2 to 4.0 m
2
In this case, 3collectors typeD10 or
1collector typeD
30 are recommended.
The coverage is approx. 65
%.
c) Vitosol 250 vacuum tube collector
Aperture area: 1.025m
2
,
Required aperture area A per occupant:
0.8 to 1.0 m
2
(see table on page40)
A
G
= A·P
A
G
= (0.8 to 1.0m
2
) · 4
A
G
= 3.2 to 4.0 m
2
In this case, 3collectors are
recommended.
The coverage is approx. 65
%.
c) Vitosol 300 vacuum tube collector
Aperture area for
type D20: 2.14 m
2
type D30: 3.21 m
2
Required aperture area A per occupant:
0.8 to 1.0 m
2
(see table on page40)
A
G
= A·P
A
G
= (0.8 to 1.0m
2
) · 4
A
G
= 3.2 to 4.0 m
2
In this case, a collector typeH30 is
recommended.
The coverage is approx. 65
%.
Open−air swimming pool
H Hamburg area
H Pool surface O=50
m
2
H Without cover, sheltered location
H Use of flat collectors
Vitosol100, type s/w2.5
H Angle of inclination: 45º
H Orientation: southfacing
H Periods for which designed:
a) April to September
b)June and July
Number of collectors z
a) Designed for period:
April to September
Required aperture area A per m
2

Pool surface area: 0.90 m
2
(see table on page40)
z=
A  O
2.5m
2
z=
0.90m
2
 50m
2
m
2
 2.5m
2
z=18
In this case, 18 collectors are required.
b) Designed for period:
June and July
Required aperture area A per m
2

Pool surface area: 0.50 m
2
(see table on page40)
z=
A  O
2.5m
2
z=
0.50m
2
 50m
2
m
2
 2.5m
2
z=10
In this case, 10 collectors are required.
Note
An example of how to calculate system data using the ViessmannESOP calculation program can be found in the appendix.
5822135 GB