User Manual
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5.3. eu.bac System certification
5.3.1. System audit and labelling – eu.bac system
Context
The primary purpose of a building is the provision of space for working and living, a place of comfort
and safety. BACS control according to design specification which must follow current facility
requirements. Current facility requirements change during the life of the building influenced by factors
such as change in use, operational priorities, technology development and regulatory requirements.
Questions to be answered:
· Is the BACS designed to support the energy efficiency goals of the building owner?
· In what content does your BACS contribute to energy efficiency of your building?
· Does the installed BACS control according to specification?
· How do the users interact with the BACS?
· Is the full potential of the installed BACS being used?
The eu.bac assessment method could help you find the answers to the above questions. Moreover,
this methodology offers an uncomplicated and effective way to benchmark the BACS and to identify
improvement potential without a detailed energy analysis. The outcome of this standardized
assessment shows the gap between the actual functionality and the optimal control functions for the
specific system. It clearly points out the improvement potential and prospective rating increase that
could be achieved with better control strategies for each specific function and field of use.
5.3.2. eu.bac methodology
The eu.bac System Method will assure the users a level of performance of their systems, as defined
in the EU directives and relevant EN standards. It rates the system efficiency and creates trust and
transparency to the benefit of building owners and occupants.
EN 15232-1:2017 function classifications are the basis
The BACS evaluation is based on a points system and is normalised to a 0–100 scale. Using points
provides a flexible and multi-value scale. Individual control functions are allocated different amounts
of points depending on their relative importance for the BACS energy efficiency. As described above,
the assignment of points directly relates to functions listed in the EN 15232-1:2017 standard (as
described in this document in 4.1 “List of relevant building automation and control functions”).
1 Heatingcontrol
1.1 Emissioncontrol HEAT_EMIS_CTRL_DEF M3–5
Thecontrolfunctionisappliedtotheheatemitter(radiators,underfloor
heating,fan-coilunit,indoorunit)atroomlevel;fortype1onefunction
cancontrolseveralrooms
0 Noautomaticcontroloftheroomtemperature
1
Central automaticcontrol:Thereisonlycentralautomaticcontrolacting
eitheronthedistributionoron thegeneration.Thiscanbeachievedfor
examplebyanoutsidetemperaturecontrollerconformingtoEN12098-1
orEN12098;onesystemcancontrolseveralrooms
2 Individualroomcontrol:Bythermostaticvalvesorelectroniccontroller
3
Individual room control with communication: Between controllers and
BACS(e.g.scheduler,roomtemperaturesetpoint)
4
Individual room control with communication and occupancy detection:
Between controllers and BACS; Demand control/occupancy detection
(thisfunctionlevelisusuallynotappliedtoanyslowreactingheat
emission systems with relevant thermal mass, e.g. floor heating, wall
heating)
Example of function classification list out of EN 15232-1:2017