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External design temperature; (Minimum) external air temperature that is used for calculating the design heat losses |
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External design temperature at the site of the building (without adjustment based on the time constant of the building); |
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Temperature correction for taking into account the time constant of the building under consideration; |
Significance for the calculation 1
The value influences the transmission heat loss of the room 
and is a component of Equation 4.
Significance for the calculation 2
The value influences the design ventilation heat loss of the room 
and is a component of Equation 17.
