User Manual

108
Wholesale and retail
Findings from user profiles for non-residential buildings
The occupancy in the user profiles vary greatly among the different types of uses for non-residential
buildings. And the BAC efficiency factors as per EN 15232 clearly illustrate the point:
· Large energy savings can be achieved in lecture halls, wholesale and retail stores
· Rather large energy savings are also possible in hotels, restaurants, office buildings and schools
· Potential energy savings are rather small in hospitals since they generally operate 24 hours a day
4.4. Overall BACS efficiency factors
You learned the following from the previous section:
· The origins of BACS efficiency factors
· All BACS efficiency factors for energy efficiency class C are 1
· All BACS efficiency factors are tied to efficiency classes A, B, C or D
In this User’s Guide we generally use the term BACS efficiency factors (it is the same as BACS
energy efficiency factors) in place of the more detailed term "BACS and TBM efficiency factors".
The BACS and TBM efficiency factors published in EN 15232 were calculated based on the energy
demand results of a large number of simulations. The following was considered as part of each
simulation:
· The occupancy profile per building type was pursuant to EN 15217
· One energy efficiency class
· All BAC and TBM functions listed in EN 15232 for this energy efficiency class
The impact of the various BAC and TBM functions on a building’s energy efficiency was determined
after comparing annual energy consumption for a representative building model for the different
BAC and TBM functionalities.
The simplified method allows you to determine the impact of BAC and TBM on the energy efficiency
of residential and various non-residential buildings to a satisfactory degree without costly
calculations.
The following tables, taken from EN 15232, are aids to determine the impact of BACS and TBM
on the energy efficiency for building projects.
Time of day
Occupancy