Description Of The Product; Cascade Configuration; Hydraulic Isolation: Low-Loss Header; De Dietrich Cascade Systems - DeDietrich Innovens MCA 160 Manual

3 Description of the product

3 Description of the product
3.1

Cascade configuration

3.2

Hydraulic isolation: low-loss header

3.3

De Dietrich cascade systems

6 MCA
In many situations it is advantageous to spread the total required heat out­
put over several boilers. This can be made possible by means of a "cas­
cade configuration". In a cascade configuration, heating boilers are con­
nected hydraulically. If the heat demand increases or decreases, boilers
are switched on or off respectively. It is then important to determine the
ideal number of boilers for the cascade. The following factors need to be
taken into account when deciding on the number of boilers:
Investment:
When boilers are split up, the investment costs (boiler cost including in­
stallation, fittings, pipe work, pumps and control equipment) can work
out lower or higher. However, this depends to a large extent on the sit­
uation.
Reliability:
Reliability increases with the number of boilers. Research has shown
that reliability is already optimum for systems with four boilers in a cas­
cade.
Efficiency:
There is no appreciable difference in terms of efficiency between several
small or one or two larger boilers.
Maintenance and faults:
There is a greater overall risk of faults in a system with several boilers. A
larger group of engineers can service and maintain smaller boilers.
Arrangement:
The compact units and therefore compact configuration means that you
have more flexibility for potential boiler locations.
Adjustment:
When using several boilers and modulating control, the heat output of­
fered is virtually equal to the heat output requested.
Important
A number of the points mentioned are dependent on the situa­
tion and so consideration as to which solution is the best will
need to be given on a project-by-project basis.
Practical experience has shown that it is beneficial to create hydraulic iso­
lation between the boiler circuit and the system circuit using a low-loss
header. This means that a widely varying volume flow on the system side
hardly influences the volume flow on the boiler side at all. This also applies
in reverse: a widely varying volume flow on the boiler side hardly influen­
ces the volume flow on the system side at all. Controlling several different
groups hydraulically is therefore significantly easier as they do not, or
barely, influence each other. This creates better overall operating condi­
tions for the system.
In order to make it as simple as possible to create a cascade configura­
tion, De Dietrich has included complete cascade systems in the range for
some years. The compact design of the boilers, combined with the smart
gas and water connection technology (no brazing) of the cascade system,
makes it possible to install a high heat output system in a small area.
For example, eight MCA 160 boilers can be installed in an area of 4.4 m²
(including low-loss header) to provide close to 1200 kW.
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