Building automation – impact on energy efficiency - Siemens ...

Building automation – impact on energy efficiency - Siemens ...

4.3.2 Factor-based calculation procedure of the BACS ong>impactong>

on the energy performance of buildings (BACS

factor method)


The BACS factor method described here has been established to allow a simple

calculation of the ong>impactong> of building ong>automationong>, control and management functions

on the building’s energy performance. The following figure 2 illustrates

how to use this approach.


Arrows (( ) illustrate only the calculation process and do not represent energy and/or mass flows

1) Delivered energy is the total energy, expressed per energy carrier (gas, oil, electricity etc.)

a) Thermal energy = overall energy use for heating, DHW, cooling, and ventilation

b) Electricity energy = overall energy use for auxiliary equipment and lighting

c) Specific energy use for heating, DHW or cooling

d) Specific energy use for auxiliary equipment or lighting

The BAC factor method gives a rough estimation of the ong>impactong> of BACS and

TBM functions on thermal and electric energy demand of the building according

to the efficiency classes A, B, C and D. The BACS factor method is specially

appropriated to the early design stage of a building because there is no special

information needed about any specific control and ong>automationong> function just the

recent (if it is an existing building) or reference building ong>automationong> class and

the classification of the building as expected or predefined.


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