NBN EN 12831 : 2003

FOREWORD
INTRODUCTION
1 SCOPE
2 NORMATIVE REFERENCES
3 TERMS, DEFINITIONS AND SYMBOLS
   3.1 TERMS AND DEFINITIONS
   3.2 SYMBOLS AND UNITS
4 PRINCIPLE OF THE CALCULATION METHOD
5 GENERAL CONSIDERATIONS
   5.1 CALCULATION PROCEDURE FOR A HEATED SPACE
   5.2 CALCULATION PROCEDURE FOR A BUILDING ENTITY OR
        A BUILDING
   5.3 CALCULATION PROCEDURE FOR THE SIMPLIFIED METHOD
6 DATA REQUIRED
   6.1 CLIMATIC DATA
   6.2 INTERNAL DESIGN TEMPERATURE
   6.3 BUILDING DATA
7 TOTAL DESIGN HEAT LOSS FOR A HEATED SPACE - BASIC CASES
   7.1 DESIGN TRANSMISSION HEAT LOSS
        7.1.1 Heat losses directly to the exterior - heat
               loss coefficient H[T,ie]
        7.1.2 Heat losses through unheated space - heat
               loss coefficient H[T,iue]
        7.1.3 Heat losses through the ground - heat loss
               coefficient H[T,ig]
        7.1.4 Heat losses to or from spaces heated at a
               different temperature - heat loss coefficient
               H[T,ij]
   7.2 DESIGN VENTILATION HEAT LOSS
        7.2.1 Hygiene - air flow rate V[min,i]
        7.2.2 Infiltration through building envelope - air
               flow rate V[inf,i]
        7.2.3 Air flow rates due to ventilation systems
   7.3 INTERMITTENTLY HEATED SPACES
8 DESIGN HEAT LOAD
   8.1 DESIGN HEAT LOAD FOR A HEATED SPACE
   8.2 DESIGN HEAT LOAD FOR A BUILDING ENTITY OR A BUILDING
9 SIMPLIFIED CALCULATION METHOD
   9.1 DESIGN HEAT LOSS FOR A HEATED SPACE
        9.1.1 Total design heat loss
        9.1.2 Design transmission heat loss
        9.1.3 Design ventilation heat loss
   9.2 DESIGN HEAT LOAD FOR A HEATED SPACE
        9.2.1 Total design heat load
        9.2.2 Intermittently heated spaces
   9.3 TOTAL DESIGN HEAT LOAD FOR A BUILDING ENTITY OR
        A BUILDING
ANNEX A (INFORMATIVE) BASIC PARAMETERS ON HUMAN COMFORT
        IN INTERIOR THERMAL ENVIRONMENTS - SIGNIFICANCE
        OF OPERATIVE TEMPERATURE IN HEAT LOAD
        CALCULATIONS
ANNEX B (INFORMATIVE) INSTRUCTIONS FOR DESIGN HEAT LOSS
        CALCULATION FOR SPECIAL CASES
   B.1 CEILING HEIGHT AND LARGE ENCLOSURE
   B.2 BUILDINGS WHERE AIR TEMPERATURE AND MEAN RADIANT
        TEMPERATURE DIFFER SIGNIFICANTLY
ANNEX C (INFORMATIVE) EXAMPLE OF A DESIGN HEAT LOAD
        CALCULATION
   C.1 GENERAL DESCRIPTION OF THE CALCULATION EXAMPLE
        C.1.1 Sample building description
        C.1.2 Plans of the building
        C.1.3 Calculations performed
   C.2 PLANS OF THE BUILDING
   C.3 SAMPLE CALCULATION
        C.3.1 General data
        C.3.2 Data on materials
        C.3.3 Data on building elements
        C.3.4 Data on thermal bridges
        C.3.5 Room transmission heat losses
        C.3.6 Room ventilation heat losses
        C.3.7 Heating-up capacity
        C.3.8 Total heat load
        C.3.9 Room heat load with the simplified method
        C.3.10 Total heat load with the simplified method
ANNEX D (NORMATIVE) DEFAULT VALUES FOR THE CALCULATIONS
        IN CLAUSES 6 TO 9
   D.1 CLIMATIC DATA
   D.2 INTERNAL DESIGN TEMPERATURE
   D.3 BUILDING DATA
   D.4 DESIGN TRANSMISSION HEAT LOSS
        D.4.1 Heat losses directly to the exterior - H[T,ie]
        D.4.2 Heat losses through unheated space - H[T,iue]
        D.4.3 Heat losses through the ground - H[T,ig]
        D.4.4 Heat losses to or from spaces heated at a
               different temperature - H[T,ij]
   D.5 DESIGN VENTILATION HEAT LOSS - H[V,I]
        D.5.1 Minimum external air exchange rate - n[min]
        D.5.2 Air exchange rate - n[50]
        D.5.3 Shielding coefficient - e
        D.5.4 Height correction factor - e
   D.6 INTERMITTENTLY HEATED SPACES
   D.7 SIMPLIFIED CALCULATION METHOD
        D.7.1 Restrictions of use
        D.7.2 Temperature correction factor - f[k]
        D.7.3 Temperature correction factor - f[delta,theta]
BIBLIOGRAPHY

Includes methods for calculating the design heat loss and the design heat load for basic cases at the design conditions.