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

4.5 Detailed BACS efficiency factors

Four sets of BACS efficiency factors for heating, cooling, DHW and electrical

energy were extracted from the results of the energy performance calculations.

They are available for the assessment of:

• Thermal energy for space heating and cooling

• Thermal energy for DHW heating

• Electric energy for ventilation, lighting and auxiliary equipment

The energy input to the building energy systems (energy use) accounts for

building energy demand, total thermal losses of the systems as well as auxiliary

energy required to operate the systems. Each of the energy systems installed in

a building shall be assessed with the right BACS factor taking into account the

correlations given in the following table.

Energy use Energy need System losses Auxiliary energy BAC factor

Heating

Q

NH

Q

H ,

-

loss

f

BACS , h

- -

W

h , aux

f

BACS , el−au

Cooling

Q

NC

Q

C ,

-

loss

f

BACS , c

- -

W

c , aux

f

BACS , el−au

Ventilation - -

W

V , aux

f

BACS , el−au

Lighting - -

W

light

f

BACS , el−li

DHW Q DHW

- -

f

BACS , DHW

89

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