EN 12831-1:2017; Equation 7 (iae - unheated rooms)

Transmission heat transfer coefficient of the heated room (i) towards the outside due to unheated rooms (ae);

Original

Original equation in universal notation.

DDS‑CAD

Adapted form for the type of transmission heat loss.

Area of a building component, k, in square meters (m²); Calculated value, from the building model

Thermal transmittance coefficient of the building component in watts per square meter and Kelvin (W/m²K); Property of the building component

ClosedHow to influence this value …

Temperature correction factor for calculating the temperature-adjusted heat transfer coefficients from room (i) to the adjacent situation; EN 12831-1:2017, Equation 9:

EN 12831-1:2017 groups together the design transmission heat loss through unheated rooms and into neighboring buildings. DDS‑CAD reports these forms of heat loss separately, however.
… towards the outside via unheated rooms (ae) The decisive factor is the status of Unheated Temp. definition for the adjacent unheated room.
… to adjacent buildings (aBuild) Unheated Temp. definition = Room temperature
Unheated Temp. definition = Edited factor F1
Unheated Temp. definition = Calculated

Significance for the calculation

The value influences the transmission heat loss of the room and is a component of Equation 4.

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