Pre-Dimensioning; Estimate Design Of Key Components; Investment Costs - Bosch CHP CE 240 NE Technical Manual

Engineering information and sizing
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.
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:
Position
Steam boiler
Steam boiler, 4-draught steam design
CHP module
Waste heat line incl. silencer
Flue gas line/chimney
MSR technology
Floor standing condensing boiler, peak
load for heating
Installation costs
Required building measures
Other services
Planning costs
Safety margin/contingencies
Total
Table 8 Investment costs
18
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.
• Output steam boiler, 2000 kg/h each
• Output BHKW 400 kW
• Peak load boiler for heating and DHW production
700 kW
• 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.
Size Unit Investment costs 4-
draught steam boiler and
CHP with MEC system
2000 kg/h
2000 kg/h
400 kW
el.
– –
– –
– –
700 kW
th.
– –
– –
– –
10 %
5 %
– –
el.
th.
Investment costs steam
[€]
–
130 000
350 000
15 000
30 000
35 000
20 000
120 000
50 000
50 000
100 000
50 000
950 000
Systemlösung – 6 720 885 509 (2018/03)
boiler
[€]
110 000
–
–
–
20 000
25 000
20 000
100 000
40 000
50 000
45 000
25 000
435 000