System For Dhw Heating And Central Heating Backup - Viessmann VITOSOL 100-F SV Technical Manual

Information regarding design and operation
Occupants
2
3
4
5
6
8
10
12
15
The details in the table apply under the following conditions:

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-
18
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.
System with Vitocell-M heating water buffer cylinder
System with Vitocell-E heating water buffer cylinder and Vitotrans 353
VIESMANN
138
Daily DHW de- Cylinder capacity in l
mand in l
(60 °C)
Dual mode
60
90 250/300
120
150 300/400
180
240
300
360
450
M
M
M
M
(cont.)
Collector
Mono mode Number
Vitosol-F
SV/SH
160
200
400
300
500
500
■ SW, S or SE orientation
■ Roof pitches from 25 to 55°
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.
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
E Solar yield at 15 m
Surface area
Vitosol-T
2
3
4
5
6
2
absorber area
2 absorber area
1 x 3.03 m 2
1 x 3.03 m 2
1 x 1.51 m 2
2
2 x 3.03 m
2 x 3.03 m 2
1 x 1.51 m 2
2
3 x 3.03 m
VITOSOL