Engineering information and sizing
Systemlösung – 6 720 885 509 (2018/03)
18
3.2 Pre-dimensioning
During a first planning phase, an estimate design of the
important system parts, a cost estimate and a
preliminary consideration of economic efficiency are
crucial.Important functional principles have to be
explained with schematic diagrams.
3.2.1 Estimate design of key components
Estimate sizing of 4-draught steam boiler
The size of the steam boiler can approximately be
calculated from the total of the individual steam
consumers plus an addition of approx. 10 % as own
steam consumption. If consumption times of individual
consumers are already defined, coincidence factors can
possibly be taken into consideration.
Estimate sizing of CHP module
The waste heat performance in the steam boiler from the
CHP module must not exceed maximum 20 %.
Estimate of elapsed time
To achieve an informative profitability assessment, the
theoretic runtimes of steam boiler and CHP module have
to be determined, by means of the existing load profiles
or operating specifications for sufficiently precisely
defined load profiles.
3.2.2 Investment costs
As a sound basis for an investment decision and for
evaluation of the investment costs and preliminary
consideration of economic efficiency, the system with
4-draught steam boiler and CHP module with MEC has to
be compared with the construction of a 3-draught boiler
system.
The shown cost estimate is based on the following
framework conditions:
• Output steam boiler, 2000 kg/h each
• Output BHKW 400 kW
el.
• Peak load boiler for heating and DHW production
700 kW
th.
• The costs have been determined incl. installation and
incidental expenses. The height of this share of costs
strongly depends on the particular local conditions of
the project. The following cost estimate is therefore
exemplary.
Position Size Unit Investment costs 4-
draught steam boiler and
CHP with MEC system
Investment costs steam
boiler
[€] [€]
Steam boiler 2000 kg/h – 110 000
Steam boiler, 4-draught steam design 2000 kg/h 130 000 –
CHP module 400 kW
el.
350 000 –
Waste heat line incl. silencer – – 15 000 –
Flue gas line/chimney – – 30 000 20 000
MSR technology – – 35 000 25 000
Floor standing condensing boiler, peak
load for heating
700 kW
th.
20 000 20 000
Installation costs – – 120 000 100 000
Required building measures – – 50 000 40 000
Other services – – 50 000 50 000
Planning costs 10 % 100 000 45 000
Safety margin/contingencies 5 % 50 000 25 000
Total –– 950 000 435 000
Table 8 Investment costs
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