User Manual

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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 Aux. Energy BACS factor

Heating

lossH

HBAC

- -

auxh

auxelBAC

Cooling

lossC

CBAC

- -

auxc

auxelBAC

Ventilation - -

auxV

auxelBAC

Lighting - -

LelBAC

DHW

- -

DHWBAC