User Manual

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4.3. Calculating the impact of BACS and TBM on a
building’s energy efficiency
4.3.1. Introduction
Calculation diagram for a building
Before going into detail on energy efficiency calculations, we will outline the sequence of the
individual calculation steps in the diagram below. The illustration shows that the calculation starts
with the consumers (handover in room) and ends with primary energy, that is, in the opposite
direction as the supply flow.
Source: prCEN/TR 15615:2007
Declaration on the general relationship between various European standards and the EPBD
("Umbrella Document").
Air exchange
Heat
transmission
Indoor and
outdoor climate
Internal gains
Solar gains
Conversion factors
Energy certification
(ways of expressing energy demand)
Primary energy
and CO
2
emissions
Net energy
demand
BAC functions
Building
Delivered
energy
Heating
system
characteristics
Cooling
system
characteristics
Ventilation
system
DHW Lighting