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Siemens EMC manual – System description CM110911en_03
Building Technologies Optional modules 18.09.2009
4 Optional modules
Energy management systems are expected to fulfill an extremely varied range of
requirements. This is why EMC is modular in structure. This means that different
functions and reports can be provided, depending on the required area of empha-
sis. Customers can add as many optional modules to the standard package as they
need to deal with their particular energy-related concerns.
4.1 Weather adjustments (WEA)
This option counteracts the influence of the weather, so that meaningful compari-
sons can be made with previous years or with buildings in other locations. Weather
adjustment is carried out based on standards (e.g. VDI3807).
The outdoor temperatures or heating degree days used for weather compensation
can be integrated in various ways.
• Meteorological institute
Data transfer is carried out automatically in consultation with the corresponding
institute (e.g. DWD and ZAMG) and offers the best possible data quality.
• Building automation and control systems/data loggers
Outdoor temperature sensors connected to customer systems can normally also
be used for weather compensation. The quality of the data is primarily depend-
ent on the location of the sensor. For precise information on the scope for using
the installed systems, contact your local Siemens office.
• Manual tables
If data is not transferred automatically, degree days can also be maintained in
manually entered tables.
The weather adjustment parameters are selected in the relevant places in the EMC
user structure.
Function
Parameter setting