I.S. EN 12831-1:2017

National Foreword
European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Description of the methods
6 Standard method - Heat load of rooms,
  building entities and buildings
7 Simplified method for the calculation
  of the design heat load of a heated space
  (single rooms)
8 Simplified method for the calculation of
  the building design heat load
9 Compliance check
Annex A (normative) - Input data, structure
        for default values
Annex B (informative) - Input data, default values
Annex C (informative) - Detailed consideration
        of thermal bridges
Annex D (informative) - Internal temperatures
        theta[u] of adjacent building entities or
        adjacent unheated spaces within the same
        building
Annex E (informative) - Equivalent thermal
        transmittance of building elements against
        ground
Annex F (informative) - Estimation of heating-up
        power in intermittently heated spaces (6.3.4)
Annex G (informative) - External air volume flow
        through large openings
Bibliography

Defines methods for the calculation of the design heat load for single rooms, building entities and buildings, where the design heat load is defined as the heat supply (power) needed to maintain the required internal design temperature under design external conditions.