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BS EN 12831-1:2017 - TC Tracked Changes. Energy performance of buildings. Method for calculation of the design heat load - Space heating load, Module M3-3, 2020
- 30309933_new.pdf [Go to Page]
- National foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations [Go to Page]
- 4.1 Symbols
- 4.2 Subscripts
- 5 Description of the methods
- 6 Standard method – Heat load of rooms, building entities and buildings [Go to Page]
- 6.1 Output data
- 6.2 Input data
- 6.3 Calculation procedure [Go to Page]
- 6.3.1 Design heat load [Go to Page]
- 6.3.1.1 Building (build)
- 6.3.1.2 Building entity (BE)
- 6.3.1.3 Heated space (i)
- 6.3.2 Design transmission heat losses of a heated space (i) [Go to Page]
- 6.3.2.1 Total and partial design transmission heat loss ΦT,i and ΦT,ix
- 6.3.2.2 Heat transfer coefficient directly to the exterior, HT,ie
- 6.3.2.3 Heat transfer coefficient to adjacent spaces HT,ia
- 6.3.2.4 Heat transfer coefficient through the ground HT,ig
- 6.3.2.5 Temperature adjustment factor fix,k
- 6.3.3 Design ventilation heat loss [Go to Page]
- 6.3.3.1 General
- 6.3.3.2 Simplified Calculation in air-tight buildings with neither fan-assisted ventilation nor ATDs
- 6.3.3.3 General calculation model
- 6.3.3.4 Air tightness
- 6.3.3.5 Minimum air volume flow
- 6.3.3.6 Envelope surfaces Aenv,z/i
- 6.3.3.7 Estimation of supply and exhaust air temperatures
- 6.3.4 Additional heating-up power in intermittently heated spaces
- 6.3.5 Time constant
- 6.3.6 Heat transfer coefficients without temperature adjustment
- 6.3.7 External design temperature (climatic data)
- 6.3.8 Influence of the heat emission system in high rooms (ceiling height ≥ 4 m) [Go to Page]
- 6.3.8.1 General
- 6.3.8.2 Mean internal surface temperatures
- 6.3.8.3 Mean internal air temperature
- 7 Simplified method for the calculation of the design heat load of a heated space (single rooms) [Go to Page]
- 7.1 Output data
- 7.2 Input data
- 7.3 Calculation procedure [Go to Page]
- 7.3.1 Design heat load of a heated space
- 7.3.2 Design transmission heat loss of a heated space
- 7.3.3 Design ventilation heat loss of a heated space
- 8 Simplified method for the calculation of the building design heat load [Go to Page]
- 8.1 Output data
- 8.2 Input data
- 8.3 Calculation procedure [Go to Page]
- 8.3.1 Building design heat load
- 8.3.2 Building design transmission heat loss
- 8.3.3 Design ventilation heat loss of a building
- 9 Compliance check [Go to Page]
- 9.1 General
- 9.2 Dimensioning of heat emission systems
- 9.3 Dimensioning of heat generators
- Annex A (normative)Input data, structure for default values [Go to Page]
- A.1 General
- A.2 Input data for the standard method (6) [Go to Page]
- A.2.1 Consideration of thermal bridges
- A.2.2 Correction of U-values for the influence of building element properties and meteorological conditions
- A.2.3 Heat loss through the ground
- A.2.4 Temperature adjustment for heat loss to unheated spaces
- A.2.5 Internal temperatures of adjacent building entities
- A.2.6 Influence of the heat emission system in high rooms
- A.2.7 Specific thermal storage capacity ceff
- A.2.8 Specific properties of air
- A.2.9 Volume flow ratio between room (i) and zone (z)
- A.2.10 Air tightness
- A.2.11 Minimum air change rate
- A.2.12 Coefficient for the volume flow ratio fqv,z
- A.2.13 Estimation of design data of external ATDs
- A.2.14 Pressure exponent for leakages
- A.2.15 Adjustment factor for the orientation of the zone (orientation factor)
- A.2.16 Adjustment factor for the number of exposed facades
- A.2.17 Air volume flow through large openings
- A.2.18 Additional heating-up power in intermittently heated spaces ϕhu
- A.2.19 Heat gains Φgain
- A.3 Input data for the simplified methods (7, 8) [Go to Page]
- A.3.1 Ratio between external and internal surface areas
- A.3.2 Thermal bridges
- A.3.3 Temperature correction factor fx
- A.3.4 Air change rate
- A.4 Input data for the standard method and the simplified methods [Go to Page]
- A.4.1 Climatic data
- A.4.2 Internal design temperature
- A.4.3 Simplified determination of U-Values
- Annex B (informative)Input data, default values [Go to Page]
- B.1 General
- B.2 Input data for the standard method (6) [Go to Page]
- B.2.1 Consideration of thermal bridges
- B.2.2 Correction of U-values for the influence of building element properties and meteorological conditions
- B.2.3 Heat loss through the ground
- B.2.4 Temperature adjustment for heat loss to unheated spaces
- B.2.5 Internal temperatures of adjacent building entities
- B.2.6 Influence of the heat emission system in high rooms
- B.2.7 Specific thermal storage capacity ceff
- B.2.8 Specific properties of air
- B.2.9 Volume flow ratio between room (i) and zone (z)
- B.2.10 Air tightness
- B.2.11 Coefficient for the volume flow ratio fqv,z
- B.2.12 Estimation of design data of external ATDs
- B.2.13 Pressure exponent for leakages
- B.2.14 Adjustment factor for the orientation of the zone (orientation factor)
- B.2.15 Adjustment factor for the number of exposed facades
- B.2.16 Air volume flow through large openings
- B.2.17 Additional heating-up power in intermittently heated spaces ϕhu
- B.2.18 Heat gains Φgain
- B.3 Input data for the simplified methods (7, 8) [Go to Page]
- B.3.1 Ratio between external and internal surface areas
- B.3.2 Thermal bridges
- B.3.3 Temperature correction factor fx
- B.3.4 Air change rate
- B.4 Input data for the standard method and the simplified methods [Go to Page]
- B.4.1 Climatic data
- B.4.2 Internal design temperature
- B.4.3 Simplified determination of U-Values [Go to Page]
- B.4.3.1 Simplified determination of U-values based on build year
- B.4.3.2 Simplified determination of U-values for building elements with later mounted thermal insulation
- B.4.3.3 Simplified determination of U-values based on temperature measurements
- Annex C (informative)Detailed consideration of thermal bridges
- Annex D (informative)Internal temperatures θu 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) [Go to Page]
- F.1 General
- F.2 Determination of the specific heating-up power φhu,i based on the time of disuse
- F.3 Determination of the specific heating-up power φhu,i based on the internal temperature drop during setback
- Annex G (informative)External air volume flow through large openings [Go to Page]