2.4.7 Combination with storage tank
Observe the regional regulations for using a storage tank!
Certain subsidy guidelines prescribe compulsory requirements for the installation of
storage tanks. Up-to-date information about individual subsidy guidelines can be found
at www.froeling.com.
Channelling the heat generated by the Firewood boiler to a storage tank can bring
major advantages, including:
❒ better utilisation of fuel
❒ more user-friendly operation in terms of reloading intervals
❒ maximum independence from instantaneous heating requirements
❒ minimal dirt in boiler and flue gas system
As the boiler’s minimum continuous heat output is 30% above the nominal heat
output, we as boiler manufacturer are obliged under EN 303-5:2012, Section 4.4.6 to
advise that the Firewood boiler S3 Turbo must always be connected to a storage tank
with adequate storage capacity.
Certain countries have recommended storage capacities; these are listed below. The
specified values apply when the nominal heat output of the boiler corresponds to the
heating requirements of the building and a maximum of 50% of the nominal heat
output can be dissipated to the building being heated under partial load conditions.
The storage tank capacity can be calculated according to EN 303-5:2012 using the
following formula:
V
Sp
= 15T
B
x Q
N
(1 - 0.3 x Q
H
/Q
min
)
V
Sp
Q
N
T
B
Q
H
Q
min
Storage tank capacity in [l]
Nominal heat output of boiler in [kW]
Burn-off period of boiler in [h]
1)
Heating load of building in [kW]
Minimum heat output of boiler in [kW]
2)
1.Sample combustion times for various fuels are provided in the technical data
2.The boiler’s minimum output is the lowest value of the output range in the technical data. If there is no minimum heat output specified, use
the nominal heat output (Q
min
= Q
N
)
According to the relevant Austrian laws governing energy technology, which are based
on Art. 15a B-VG "Agreement on protective measures for small furnaces" (2012):
No storage tank is required on manually fed biomass boilers that have been positively
tested at both nominal load and partial load (below 50% of nominal load) to ensure
they adhere to the emissions limits specified in that agreement.
Recommended storage tank capacity:
Unit
S3 Turbo
20 – 30
1)
S3 Turbo
40 - 45
Recommended storage tank capacity
2)
[l]
1700
3000
1.Applies for S3 Turbo 18 as well (only available in Italy)
2.Values for calculating the capacity can be found in the technical data or the technical data with partial load inspection (if available)
General information
Austria
2
Safety
Design Information
12
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