BS EN 12831-1:2017
$215.11
Energy performance of buildings. Method for calculation of the design heat load – Space heating load, Module M3-3
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 98 |
This European Standard covers 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. Table 1 shows the relative position of this standard within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000 -1. NOTE 1 In CEN ISO/TR 52000 2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation. NOTE 2 The modules represent EPB standards, although one EPB standard may cover more than one module and one module may be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Tables A.1 and B.1. (…)
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 10 | 1 Scope |
| 14 | 2 Normative references 3 Terms and definitions |
| 17 | 4 Symbols and abbreviations 4.1 Symbols |
| 18 | 4.2 Subscripts |
| 21 | 5 Description of the methods |
| 22 | 6 Standard method – Heat load of rooms, building entities and buildings 6.1 Output data |
| 23 | 6.2 Input data |
| 29 | 6.3 Calculation procedure 6.3.1 Design heat load 6.3.1.1 Building (build) 6.3.1.2 Building entity (BE) |
| 30 | 6.3.1.3 Heated space (i) |
| 31 | 6.3.2 Design transmission heat losses of a heated space (i) 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 |
| 32 | 6.3.2.3 Heat transfer coefficient to adjacent spaces HT,ia |
| 33 | 6.3.2.4 Heat transfer coefficient through the ground HT,ig 6.3.2.5 Temperature adjustment factor fix,k |
| 35 | 6.3.3 Design ventilation heat loss 6.3.3.1 General 6.3.3.2 Simplified Calculation in air-tight buildings with neither fan-assisted ventilation nor ATDs |
| 36 | 6.3.3.3 General calculation model |
| 40 | 6.3.3.4 Air tightness |
| 41 | 6.3.3.5 Minimum air volume flow 6.3.3.6 Envelope surfaces Aenv,z/i |
| 42 | 6.3.3.7 Estimation of supply and exhaust air temperatures |
| 43 | 6.3.4 Additional heating-up power in intermittently heated spaces |
| 44 | 6.3.5 Time constant |
| 45 | 6.3.6 Heat transfer coefficients without temperature adjustment |
| 46 | 6.3.7 External design temperature (climatic data) |
| 48 | 6.3.8 Influence of the heat emission system in high rooms (ceiling height ≥ 4 m) 6.3.8.1 General |
| 49 | 6.3.8.2 Mean internal surface temperatures 6.3.8.3 Mean internal air temperature |
| 50 | 7 Simplified method for the calculation of the design heat load of a heated space (single rooms) 7.1 Output data 7.2 Input data |
| 51 | 7.3 Calculation procedure 7.3.1 Design heat load of a heated space |
| 52 | 7.3.2 Design transmission heat loss of a heated space 7.3.3 Design ventilation heat loss of a heated space |
| 53 | 8 Simplified method for the calculation of the building design heat load 8.1 Output data 8.2 Input data |
| 54 | 8.3 Calculation procedure 8.3.1 Building design heat load |
| 55 | 8.3.2 Building design transmission heat loss 8.3.3 Design ventilation heat loss of a building |
| 56 | 9 Compliance check 9.1 General 9.2 Dimensioning of heat emission systems 9.3 Dimensioning of heat generators |
| 57 | Annex A (normative)Input data, structure for default values A.1 General A.2 Input data for the standard method (6) 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 |
| 58 | 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 |
| 59 | A.2.7 Specific thermal storage capacity ceff A.2.8 Specific properties of air |
| 60 | A.2.9 Volume flow ratio between room (i) and zone (z) A.2.10 Air tightness A.2.11 Minimum air change rate |
| 61 | 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) |
| 62 | 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) A.3.1 Ratio between external and internal surface areas |
| 63 | 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 A.4.1 Climatic data |
| 66 | A.4.2 Internal design temperature A.4.3 Simplified determination of U-Values |
| 67 | Annex B (informative)Input data, default values B.1 General B.2 Input data for the standard method (6) 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 |
| 68 | 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 |
| 69 | B.2.7 Specific thermal storage capacity ceff |
| 70 | B.2.8 Specific properties of air B.2.9 Volume flow ratio between room (i) and zone (z) B.2.10 Air tightness |
| 71 | B.2.11 Coefficient for the volume flow ratio fqv,z |
| 72 | B.2.12 Estimation of design data of external ATDs |
| 73 | 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) B.3.1 Ratio between external and internal surface areas |
| 74 | 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 B.4.1 Climatic data |
| 75 | B.4.2 Internal design temperature |
| 76 | B.4.3 Simplified determination of U-Values B.4.3.1 Simplified determination of U-values based on build year |
| 77 | 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 |
| 79 | Annex C (informative)Detailed consideration of thermal bridges |
| 80 | Annex D (informative)Internal temperatures θu of adjacent building entities or adjacent unheated spaces within the same building |
| 83 | Annex E (informative)Equivalent thermal transmittance of building elements against ground |
| 86 | Annex F (informative)Estimation of heating-up power in intermittently heated spaces (6.3.4) F.1 General |
| 88 | F.2 Determination of the specific heating-up power φhu,i based on the time of disuse |
| 89 | F.3 Determination of the specific heating-up power φhu,i based on the internal temperature drop during setback |
| 91 | Annex G (informative)External air volume flow through large openings |
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