System For Heating Dhw; System For Dhw Heating And Central Heating Backup - Viessmann Vitosol 100-FM Technical Manual

Information regarding design and operation

System for heating DHW

DHW heating in detached houses can be realised either with one
dual mode DHW cylinder or with two mono mode DHW cylinders (for
retrofitting an existing system).
Examples
For further detailed examples, see the "System examples" manual.
M
System with a dual mode DHW cylinder
Occupants Daily DHW
demand in l
(60 °C)
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 sim-
ple 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 instantaneous water heater principle, enabling high draw-off
rates to be achieved. Static DHW volumes are reduced to a mini-
mum.
The stratification system inside the Vitocell 360-M and Vitocell 160-E
optimises the heating of the buffer cylinder. The water inside the buf-
fer cylinder that is heated by solar energy is channelled by a heating
lance directly into the upper area of the buffer cylinder. Conse-
quently, DHW is made available more rapidly.
Examples
For further detailed examples, see the "System examples" manual.
VITOSOL
Cylinder capacity in l
Dual mode Mono mode
60
90 250/300
120
150 300/400
180 400
240
300
360
500
450
(cont.)
System with 2 mono mode DHW cylinders
The basis for sizing a solar thermal system for DHW heating is the
DHW demand.
Viessmann packs are sized for solar coverage of approx. 60 %. The
cylinder capacity must be greater than the daily DHW demand, tak-
ing the required DHW temperature into account.
To achieve solar coverage of approx. 60 %, the collector system
must be sized so that the entire cylinder capacity can be heated on a
single sunny day (5 hours of full sunshine) to at least 60 °C. This
would allow for a subsequent day with poor insolation to be bridged.
Collector
Number
Vitosol-FM/-F
SV/SH
160
200
300
500
■ SW, S or SE orientation
■ Roof pitches from 25 to 55°
System with Vitocell-M heating water buffer cylinder
M
Surface area
Vitosol-TM
2
1 x 3.03 m
2
1 x 3.03 m 2
3
1 x 1.51 m 2
2
2 x 3.03 m
4
5 2 x 3.03 m 2
1 x 1.51 m 2
6 3 x 3.03 m 2
M
M
VIESMANN
119
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