28
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Technical description
UNIMAT
6 720 807 794 (2013/04)
Fig. 20 Combustion chamber volume load for UNIMAT UT-L boiler, subject to the boiler output — overview 2
FVB Combustion chamber volume load
Q
B
Rated heating output
3.5.4
Boiler efficiency, standard seasonal efficiency
[to DIN] and standby loss
Boiler efficiency and standard seasonal efficiency [to
DIN]
The
boiler efficiency
denotes the ratio of generated
output compared to rated heat input, subject to the
boiler load and system temperature.
η
K
Boiler efficiency
Q
Generated output in kW
Q
B
Rated heat input in kW
The
standard seasonal efficiency
(to DIN 4702, part 8)
is measured from the partial load efficiency levels at five
fixed points in the relative boiler output ratings. The
values measured for efficiency at partial load subject to
the relative boiler output ratings should be entered
accordingly. The standard seasonal efficiency [to DIN]
for heating operation is calculated from the values
derived in this way using the following equation:
η
N
Standard seasonal efficiency [to DIN]
ϕ
i
Relative boiler output
For boiler efficiency and standard seasonal efficiency [to
DIN] for the various sizes of UNIMAT UT-L boilers, see
also Tab. 17 on page 29.
0
2000
4000
6000
8000
10000
14000
16000
12000
18000
20000
1,4
1,3
1,2
1,1
1,0
0,9
0,8
Q
K
[kW]
FVB [MW/m
3
]
6 720 803 977-07.1ITL
UT-L 2
UT-L 6
UT-L 8
UT-L 16
UT-L 16
UT-L 20
UT-L 22
UT-L 32
UT-L 26
UT-L 36
UT-L38
UT-L 44
UT-L 52
UT-L 56
UT-L 62
UT-L 48
η
K
Q
Q
B
----------
=
η
N
5
1
η
ϕ
i
----------
i
1
=
5
----------------------
=
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