Viessmann Vitolig 200 - Application Examples

4 Vitolig 200
V
cyl
+ 15 T
B
Q
N
ǒ
1 * 0.3
Q
H
Q
min
Ǔ
V
cyl
+ 15 T
B
Q
N
ǒ
1 * 0.3
Q
H
Q
min
Ǔ
V
cyl
+ 15 4h 26kW
ǒ
1 * 0.3
22kW
13kW
Ǔ
+ 768l
Calculated heating water buffer storage unit contents:
V
cyl
+ 15 T
B
Q
N
ǒ
1 * 0.3
Q
H
Q
min
Ǔ
Calculated heating water buffer storage unit contents:
V
cyl
+ 15 5.5h 40kW
ǒ
1 * 0.3
33kW
20kW
Ǔ
+ 1667l
35
Heating water buffer storage unit
The heating water buffer storage unit
ensures rapid heating up in the morning
and that sufficient heat is drawn under all
operating conditions.
Calculate the required contents of the
heating water buffer storage unit using
the adjacent formula:
Sizing basis acc. to EN 303−5.
V
cyl
Heating water buffer storage unit in
litres
T
B
Combustion duration at
rated output in hours
Q
N
Rated output in kW
Q
H
Heat demand of the building in kW
Q
min
Lowest output in kW
Deduct rooms which are temporarily
unheated (guest rooms, public rooms,
weekend accommodation etc.) from the
calculated heat demand.
Please note
According to the 1st BlmSchV, a storage
volume of 25 l/kW rated boiler output
must not be exceeded.
Combustion duration T
B
subject to type of firewood and filling volume
Fuel
(% )
Filling volume in kWh Combustion duration T
B
in hours
(20 % water content)
for Vitolig 200
with a rated output of
at full load
for Vitolig 200
with a rated output of
at partial load (50%)
for Vitolig 200
with a rated output of
13 −26 kW 20 −40 kW 13 −26 kW 20 −40 kW 13 −26 kW 20 −40 kW
Beech  fully filled 180 252 5.5 5.5 11 11
Common spruce  fully filled 120 168 4 4 8 8
Beech  50 % full 90 126 2.5 2.5 5.5 5.5
Common spruce  50 % full 60 84 2 2 4 4
Wood briquettes  fully filled 390 550 13 13 26 26
Wood briquettes  50 % full 195 275 6.5 6.5 13 13
Example  calculation for sizing a heating water buffer storage unit
Example 1 for a building heat demand of 22 kW
Semi−detached house with a calculated
heat demand for the building of Q
H
=
22 kW.
Fuel: Common spruce (softwood), length
0.5 m stored for two years
(water content = 25 %)
The system should be operated with a
Vitolig 200 (rated output Q
N
= 26 kW).
Sizing acc. to EN 303−5:
T
B
= 4 h (combustion duration at
rated output in hours)
Q
N
= 26 kW (rated output of
Vitolig 200, 13 to 26 kW)
Q
H
= 22 kW (calculated heat demand of
the building)
Q
min
= 13 kW (lowest output of Vitolig
200, 13 to 26 kW)
This calculation results in a requirement of heating water buffer storage unit contents of at least 768 litres.
Example 2 for a building heat demand of 33 kW
Agricultural building with a calculated
heat demand for the building of Q
H
=
33 kW.
Fuel: Beech (hardwood), length 0.5 m
stored for two years
(water content = 25 %)
The system should be operated with a
Vitolig 200 (rated output Q
N
= 40 kW).
Sizing acc. to EN 303−5:
T
B
= 5.5 h (combustion duration at
rated output in hours)
Q
N
= 40 kW (rated output of
Vitolig 200, 20 to 40 kW)
Q
H
= 33 kW (calculated heat demand of
the building)
Q
min
= 20 kW (lowest output of Vitolig
200, 20 to 40 kW)
This calculation results in a requirement of heating water buffer storage unit contents of at least 1667 litres.
5822241 GB