Engineering information and sizing
31
Systemlösung – 6 720 885 509 (2018/03)
• Modulating or step CHP control depends on steam
demand of a 4-draught steam boiler and heat
requirement of the DHW system
Fig. 16 Control behaviour CHP – 4-draught steam boiler
• Calculation of used CHP flue gas performance in the
steam boiler is possible without expensive additional
measuring devices. The obtained value is used in the
control and visualised in the HMI
1)
.
• Visualisation of CHP runtime for monitoring and
adherence to CHP subsidy with runtime prognosis
function
• Bar chart for created vapour, DHW and current for the
corresponding CHP section
• CHP control with adherence to CHP subsidy: With
bypass operation, as described in
on page
20
, it is
possible to achieve certain benefits, such as a longer
CHP runtime and the reduction or prevention of CHP
pulsing. In this operating condition, the CHP annual
efficiency is reduced due to not used flue gas energy
which leads to problems for obtaining public subsidy
programmes. For this reason, the customer has the
possibility to enter the limit corresponding to the
subsidy regulations for the minimum annual efficiency.
MEC System continously controls the annual efficiency
and prevents a falling below the entered limit. In
consequence, the maximum CHP runtime without
falling below the required annual efficiency is possible.
All required sensors and actuators, with exception of 2
meters, are used for MEC system functionality. The 2
meters are the gas flow meter and the current flow
meter of the current generated in the CHP. For this
purpose, usually calibrated meters of energy
corporations are installed. For planning it has to be
observed that these meters have an M-Bus interface or
optionally an impulse outlet for connecting them to the
MEC system.
In the quotation phase of the CHP and the steam boiler,
it has to be known that a MEC system is also ordered so
the corresponding interfaces and configurations can be
planned for the unit controller.
Due to safety regulations, the CHP and the steam boiler
always have their own unit controller. For steam boilers
this corresponds to BCO. If further components are
required, such as e.g. water treatment for the steam
boiler, automatically an SCO is planned for activating
these components.
The interfaces between MEC system and the unit
controllers are automatically configured by Bosch.
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