H Examples Of Estimates Of The Required Collector Surface Area And The Number Of Collectors - Viessmann Vitosol
100 Technical Manual

Examples of estimates of the required collector area and number of collectors
Example 1
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 = 45 ºC
w
H Cold water temperature t = 10 ºC
k
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 = 50 litres/(d · person)
p
This gives a hot water requirement for
4 persons of 200 litres/d.
Cylinder capacity
(see page 38)
Selected cylinder temperature
= 60 ºC
t
cyl
2 @ V @ P @ t * t
p w
V =
* t
cyl min
t
cyl k
2 @ 50 @ 4 @ ( 45 * 10 )
V =
60 * 10
cyl min
V = 280 litres
cyl min
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.
Note
An example of how to calculate system data using the Viessmann ESOP calculation program can be found in the appendix.
VITOSOL
3.1 Calculating the required collector surface area
Total surface area A
collectors z
a) Vitosol 100 flat collector, type s/w 2.5
Aperture area: 2.50 m
Required aperture area A per occupant:
2
1.2 to 1.5 m
A = A · P
G
A = (1.2 to 1.5 m
G
A = 4.8 to 6.0 m
G
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:
type D20:
type D30:
Required aperture area A per occupant:
2
0.8 to 1.0 m
A = A · P
G
A = (0.8 to 1.0 m
G
A = 3.2 to 4.0 m
G
In this case, 3 collectors type D 10 or
1 collector type D 30 are recommended.
k
The coverage is approx. 65 %.
c) Vitosol 250 vacuum tube collector
Aperture area: 1.025 m
Required aperture area A per occupant:
2
0.8 to 1.0 m
A = A · P
G
A = (0.8 to 1.0m
G
A = 3.2 to 4.0 m
G
In this case, 3 collectors are
recommended.
The coverage is approx. 65 %.
c) Vitosol 300 vacuum tube collector
Aperture area for
type D 20:
type D 30:
Required aperture area A per occupant:
2
0.8 to 1.0 m
A = A · P
G
A = (0.8 to 1.0 m
G
A = 3.2 to 4.0 m
G
In this case, a collector type H 30 is
recommended.
The coverage is approx. 65 %.
and number of
G
2
,
(see table on page 40)
2
) · 4
2
2
1.07 m
2
2.14 m
2
3.21 m
(see table on page 40)
2
) · 4
2
2
,
(see table on page 40)
2
) · 4
2
2
2.14 m
2
3.21 m
(see table on page 40)
2
) · 4
2
Example 2
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
(see table on page 40)
z = A @ O
2
2.5 m
@ 50 m
2 2
z = 0.90 m
@ 2.5 m
2 2
m
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
(see table on page 40)
z = A @ O
2
2.5 m
@ 50 m
2 2
z = 0.50 m
@ 2.5 m
2 2
m
z = 10
In this case, 10 collectors are required.
2
2
41