User Manual

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4.4.2. Overall BACS efficiency factors for electrical energy
According to EN 15232, electric energy in this context means lighting energy and electric energy
required for auxiliary equipment. The BACS efficiency factors in following table for electric energy
(but not electric energy for the equipment) are classified depending on the building type and the
efficiency class of the BACS and TBM system.
The factors for efficiency class C are defined to be 1 as this class represents a standard functionality
of BACS and TBM system. The use of efficiency classes B or A always leads to lower BACS
efficiency factors, i.e. an improvement of building performance.
Non-residential building types
BACS efficiency factors electrical f
BAC,el
D C B A
Non energy
efficient
Standard
(reference)
Advanced
energy
efficiency
High energy
performance
Offices
1.10 1 0.93 0.87
Lecture halls
1.06 1 0.94 0.89
Educational buildings (schools)
1.07 1 0.93 0.86
Hospitals
1.05 1 0.98 0.96
Hotels
1.07 1 0.95 0.90
Restaurants
1.04 1 0.96 0.92
Wholesale and retail buildings
1.08 1 0.95 0.91
Other types:
· Sport facilities
· Storage
· Industrial facilities
· etc.
1
Residential building types
BACS efficiency factors electrical f
BAC,el
D C B A
Non energy
efficient
Standard
(reference)
Advanced
energy
efficiency
High energy
performance
· Single family dwellings
· Multi family houses
· Apartment houses
· Other residential or residential-like buildings
1.08 1 0.93 0.92