EN 12831-1:2017; Equation 7 (iae - unbeheizte Räume, Berechnung Raumtemperatur)

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

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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
       
         

Adjustment for deviations between the temperature of a room and the external design temperature; EN 12831-1:2017, Equation 10 / Table 7

Interior temperature of the heated room (i); Standard conditions

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Temperature in the unheated room;

Calculated value: EN 12831-1:2017, Equation D.1

Please note the information on restrictions found in

  • EN 12831-1:2017; Appendix D
  • DIN SPEC 12831-1; 4.4.3.2

External design temperature; (Minimum) external air temperature that is used for calculating the design heat losses;

Calculated value, EN 12831-1:2017, Equation 45

Adjustment for deviations between the internal design temperature of a room (i) and the mean surface temperature of the component (k);

Calculated value: EN 12831-1:2017, Equation 11

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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