Occupants
Daily DHW de-
mand in l
(60 °C)
Cylinder capacity in l
Collector
Dual mode
Mono mode
Number
Vitosol-F
SV/SH
Surface area
Vitosol-T
2
60
250/300
160
2
1 x 3.03 m
2
3
90
4
120
5
150
300/400
200
1 x 3.03 m
2
1 x 1.51 m
2
6
180
400
3
8
240
500
300
4
2 x 3.03 m
2
10
300
12
360
500
5
2 x 3.03 m
2
1 x 1.51 m
2
15
450
6
3 x 3.03 m
2
The details in the table apply under the following conditions:
■ SW, S or SE orientation
■ Roof pitches from 25 to 55°
System for DHW heating and central heating backup
Systems for central heating backup can be designed with very simple
hydraulic connections by using a heating water buffer cylinder with
integral DHW heating, e.g. Vitocell 340-M or Vitocell 360-M. A Vitocell
140-E or 160-E heating water buffer cylinder, combined with a dual
mode DHW cylinder or Vitotrans 353, can be used as an alternative.
The Vitotrans 353 generates DHW in accordance with the instantane-
ous water heater principle, enabling high draw-off rates to be achieved.
Static DHW volumes are reduced to a minimum.
The stratification system inside the Vitocell 360-M and Vitocell 160-E
optimises the heating of the buffer cylinder. The water inside the buffer
cylinder that is heated by solar energy is channelled by a heating lance
directly into the upper area of the buffer cylinder. Consequently, DHW
is made available more rapidly.
Examples
For further detailed examples, see the "System examples" manual.
M
M
System with Vitocell-M heating water buffer cylinder
M
M
System with Vitocell-E heating water buffer cylinder and Vitotrans 353
For sizing a system for DHW heating and central heating backup, the
seasonal efficiency of the entire heating system must be taken into
consideration. The summer heat demand is always decisive. This is a
combination of the heat demand for DHW heating and other project-
specific consumers. The collector area must be sized for this demand.
The calculated collector area is multiplied by a factor of 2 to 2.5. The
result is the range within which the collector area should be for solar
central heating backup. The precise determination is then made taking
into consideration the building conditions and the planning of an opera-
tionally reliable collector array.
Jan.
Feb. Mar. Apr.
Aug.
May Jun. Jul.
Sep. Oct. Nov. Dec.
Energy demand in %
100
75
50
25
0
A
Central heating demand for a house (built in approx. 1984 or
later)
B
Central heating demand for a low energy house
C
DHW demand
D
Solar yield at 5 m
2
absorber area
E
Solar yield at 15 m
2
absorber area
Information regarding design and operation
(cont.)
138
VIESMANN
VITOSOL
18
5822 440 GB
